Move headers from grpc++ to grpcpp

84 files changed, 495 insertions, 8128 deletions

diff --git a/include/grpc++/alarm.h b/include/grpc++/alarm.h
index 37d4189201..dce742ee88 100644
--- a/include/grpc++/alarm.h
+++ b/include/grpc++/alarm.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,72 +16,13 @@
  *
  */
 
-/// An Alarm posts the user provided tag to its associated completion queue upon
-/// expiry or cancellation.
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_ALARM_H
 #define GRPCXX_ALARM_H
 
-#include <grpc++/impl/codegen/completion_queue.h>
-#include <grpc++/impl/codegen/completion_queue_tag.h>
-#include <grpc++/impl/codegen/grpc_library.h>
-#include <grpc++/impl/codegen/time.h>
-#include <grpc++/impl/grpc_library.h>
-#include <grpc/grpc.h>
-
-namespace grpc {
-
-/// A thin wrapper around \a grpc_alarm (see / \a / src/core/surface/alarm.h).
-class Alarm : private GrpcLibraryCodegen {
- public:
-  /// Create an unset completion queue alarm
-  Alarm();
-
-  /// Destroy the given completion queue alarm, cancelling it in the process.
-  ~Alarm();
-
-  /// DEPRECATED: Create and set a completion queue alarm instance associated to
-  /// \a cq.
-  /// This form is deprecated because it is inherently racy.
-  /// \internal We rely on the presence of \a cq for grpc initialization. If \a
-  /// cq were ever to be removed, a reference to a static
-  /// internal::GrpcLibraryInitializer instance would need to be introduced
-  /// here. \endinternal.
-  template <typename T>
-  Alarm(CompletionQueue* cq, const T& deadline, void* tag) : Alarm() {
-    SetInternal(cq, TimePoint<T>(deadline).raw_time(), tag);
-  }
-
-  /// Trigger an alarm instance on completion queue \a cq at the specified time.
-  /// Once the alarm expires (at \a deadline) or it's cancelled (see \a Cancel),
-  /// an event with tag \a tag will be added to \a cq. If the alarm expired, the
-  /// event's success bit will be true, false otherwise (ie, upon cancellation).
-  template <typename T>
-  void Set(CompletionQueue* cq, const T& deadline, void* tag) {
-    SetInternal(cq, TimePoint<T>(deadline).raw_time(), tag);
-  }
-
-  /// Alarms aren't copyable.
-  Alarm(const Alarm&) = delete;
-  Alarm& operator=(const Alarm&) = delete;
-
-  /// Alarms are movable.
-  Alarm(Alarm&& rhs) : alarm_(rhs.alarm_) { rhs.alarm_ = nullptr; }
-  Alarm& operator=(Alarm&& rhs) {
-    alarm_ = rhs.alarm_;
-    rhs.alarm_ = nullptr;
-    return *this;
-  }
-
-  /// Cancel a completion queue alarm. Calling this function over an alarm that
-  /// has already fired has no effect.
-  void Cancel();
-
- private:
-  void SetInternal(CompletionQueue* cq, gpr_timespec deadline, void* tag);
-
-  internal::CompletionQueueTag* alarm_;
-};
-
-}  // namespace grpc
+#include <grpcpp/alarm.h>
 
 #endif  // GRPCXX_ALARM_H
diff --git a/include/grpc++/channel.h b/include/grpc++/channel.h
index e9fb5a5d09..b1154cefb3 100644
--- a/include/grpc++/channel.h
+++ b/include/grpc++/channel.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,63 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_CHANNEL_H
 #define GRPCXX_CHANNEL_H
 
-#include <memory>
-
-#include <grpc++/impl/call.h>
-#include <grpc++/impl/codegen/channel_interface.h>
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/grpc_library.h>
-#include <grpc/grpc.h>
-
-struct grpc_channel;
-
-namespace grpc {
-/// Channels represent a connection to an endpoint. Created by \a CreateChannel.
-class Channel final : public ChannelInterface,
-                      public internal::CallHook,
-                      public std::enable_shared_from_this<Channel>,
-                      private GrpcLibraryCodegen {
- public:
-  ~Channel();
-
-  /// Get the current channel state. If the channel is in IDLE and
-  /// \a try_to_connect is set to true, try to connect.
-  grpc_connectivity_state GetState(bool try_to_connect) override;
-
-  /// Returns the LB policy name, or the empty string if not yet available.
-  grpc::string GetLoadBalancingPolicyName() const;
-
-  /// Returns the service config in JSON form, or the empty string if
-  /// not available.
-  grpc::string GetServiceConfigJSON() const;
-
- private:
-  template <class InputMessage, class OutputMessage>
-  friend class internal::BlockingUnaryCallImpl;
-  friend std::shared_ptr<Channel> CreateChannelInternal(
-      const grpc::string& host, grpc_channel* c_channel);
-  Channel(const grpc::string& host, grpc_channel* c_channel);
-
-  internal::Call CreateCall(const internal::RpcMethod& method,
-                            ClientContext* context,
-                            CompletionQueue* cq) override;
-  void PerformOpsOnCall(internal::CallOpSetInterface* ops,
-                        internal::Call* call) override;
-  void* RegisterMethod(const char* method) override;
-
-  void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
-                               gpr_timespec deadline, CompletionQueue* cq,
-                               void* tag) override;
-  bool WaitForStateChangeImpl(grpc_connectivity_state last_observed,
-                              gpr_timespec deadline) override;
-
-  const grpc::string host_;
-  grpc_channel* const c_channel_;  // owned
-};
-
-}  // namespace grpc
+#include <grpcpp/channel.h>
 
 #endif  // GRPCXX_CHANNEL_H
diff --git a/include/grpc++/client_context.h b/include/grpc++/client_context.h
index cf42a627ad..4b23644059 100644
--- a/include/grpc++/client_context.h
+++ b/include/grpc++/client_context.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,24 +16,13 @@
  *
  */
 
-/// A ClientContext allows the person implementing a service client to:
-///
-/// - Add custom metadata key-value pairs that will propagated to the server
-/// side.
-/// - Control call settings such as compression and authentication.
-/// - Initial and trailing metadata coming from the server.
-/// - Get performance metrics (ie, census).
-///
-/// Context settings are only relevant to the call they are invoked with, that
-/// is to say, they aren't sticky. Some of these settings, such as the
-/// compression options, can be made persistant at channel construction time
-/// (see \a grpc::CreateCustomChannel).
-///
-/// \warning ClientContext instances should \em not be reused across rpcs.
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
 
 #ifndef GRPCXX_CLIENT_CONTEXT_H
 #define GRPCXX_CLIENT_CONTEXT_H
 
-#include <grpc++/impl/codegen/client_context.h>
+#include <grpcpp/client_context.h>
 
 #endif  // GRPCXX_CLIENT_CONTEXT_H
diff --git a/include/grpc++/completion_queue.h b/include/grpc++/completion_queue.h
index a71123e0af..98ef18f0f6 100644
--- a/include/grpc++/completion_queue.h
+++ b/include/grpc++/completion_queue.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_COMPLETION_QUEUE_H
 #define GRPCXX_COMPLETION_QUEUE_H
 
-#include <grpc++/impl/codegen/completion_queue.h>
+#include <grpcpp/completion_queue.h>
 
 #endif  // GRPCXX_COMPLETION_QUEUE_H
diff --git a/include/grpc++/create_channel.h b/include/grpc++/create_channel.h
index 7ba1131a5f..d95f3a9797 100644
--- a/include/grpc++/create_channel.h
+++ b/include/grpc++/create_channel.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,43 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_CREATE_CHANNEL_H
 #define GRPCXX_CREATE_CHANNEL_H
 
-#include <memory>
-
-#include <grpc++/channel.h>
-#include <grpc++/security/credentials.h>
-#include <grpc++/support/channel_arguments.h>
-#include <grpc++/support/config.h>
-
-namespace grpc {
-
-/// Create a new \a Channel pointing to \a target.
-///
-/// \param target The URI of the endpoint to connect to.
-/// \param creds Credentials to use for the created channel. If it does not
-/// hold an object or is invalid, a lame channel (one on which all operations
-/// fail) is returned.
-std::shared_ptr<Channel> CreateChannel(
-    const grpc::string& target,
-    const std::shared_ptr<ChannelCredentials>& creds);
-
-/// Create a new \em custom \a Channel pointing to \a target.
-///
-/// \warning For advanced use and testing ONLY. Override default channel
-/// arguments only if necessary.
-///
-/// \param target The URI of the endpoint to connect to.
-/// \param creds Credentials to use for the created channel. If it does not
-/// hold an object or is invalid, a lame channel (one on which all operations
-/// fail) is returned.
-/// \param args Options for channel creation.
-std::shared_ptr<Channel> CreateCustomChannel(
-    const grpc::string& target,
-    const std::shared_ptr<ChannelCredentials>& creds,
-    const ChannelArguments& args);
-
-}  // namespace grpc
+#include <grpcpp/create_channel.h>
 
 #endif  // GRPCXX_CREATE_CHANNEL_H
diff --git a/include/grpc++/create_channel_posix.h b/include/grpc++/create_channel_posix.h
index 10f7e4a60e..8c8983ba60 100644
--- a/include/grpc++/create_channel_posix.h
+++ b/include/grpc++/create_channel_posix.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,37 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_CREATE_CHANNEL_POSIX_H
 #define GRPCXX_CREATE_CHANNEL_POSIX_H
 
-#include <memory>
-
-#include <grpc++/channel.h>
-#include <grpc++/support/channel_arguments.h>
-#include <grpc/support/port_platform.h>
-
-namespace grpc {
-
-#ifdef GPR_SUPPORT_CHANNELS_FROM_FD
-
-/// Create a new \a Channel communicating over the given file descriptor.
-///
-/// \param target The name of the target.
-/// \param fd The file descriptor representing a socket.
-std::shared_ptr<Channel> CreateInsecureChannelFromFd(const grpc::string& target,
-                                                     int fd);
-
-/// Create a new \a Channel communicating over given file descriptor with custom
-/// channel arguments.
-///
-/// \param target The name of the target.
-/// \param fd The file descriptor representing a socket.
-/// \param args Options for channel creation.
-std::shared_ptr<Channel> CreateCustomInsecureChannelFromFd(
-    const grpc::string& target, int fd, const ChannelArguments& args);
-
-#endif  // GPR_SUPPORT_CHANNELS_FROM_FD
-
-}  // namespace grpc
+#include <grpcpp/create_channel_posix.h>
 
 #endif  // GRPCXX_CREATE_CHANNEL_POSIX_H
diff --git a/include/grpc++/ext/health_check_service_server_builder_option.h b/include/grpc++/ext/health_check_service_server_builder_option.h
index 89af294aa9..cb82fc03b6 100644
--- a/include/grpc++/ext/health_check_service_server_builder_option.h
+++ b/include/grpc++/ext/health_check_service_server_builder_option.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,32 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_EXT_HEALTH_CHECK_SERVICE_SERVER_BUILDER_OPTION_H
 #define GRPCXX_EXT_HEALTH_CHECK_SERVICE_SERVER_BUILDER_OPTION_H
 
-#include <memory>
-
-#include <grpc++/health_check_service_interface.h>
-#include <grpc++/impl/server_builder_option.h>
-#include <grpc++/support/config.h>
-
-namespace grpc {
-
-class HealthCheckServiceServerBuilderOption : public ServerBuilderOption {
- public:
-  /// The ownership of \a hc will be taken and transferred to the grpc server.
-  /// To explicitly disable default service, pass in a nullptr.
-  explicit HealthCheckServiceServerBuilderOption(
-      std::unique_ptr<HealthCheckServiceInterface> hc);
-  ~HealthCheckServiceServerBuilderOption() override {}
-  void UpdateArguments(ChannelArguments* args) override;
-  void UpdatePlugins(
-      std::vector<std::unique_ptr<ServerBuilderPlugin>>* plugins) override;
-
- private:
-  std::unique_ptr<HealthCheckServiceInterface> hc_;
-};
-
-}  // namespace grpc
+#include <grpcpp/ext/health_check_service_server_builder_option.h>
 
 #endif  // GRPCXX_EXT_HEALTH_CHECK_SERVICE_SERVER_BUILDER_OPTION_H
diff --git a/include/grpc++/ext/proto_server_reflection_plugin.h b/include/grpc++/ext/proto_server_reflection_plugin.h
index ee3fafd7da..02e21b9219 100644
--- a/include/grpc++/ext/proto_server_reflection_plugin.h
+++ b/include/grpc++/ext/proto_server_reflection_plugin.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,39 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_EXT_PROTO_SERVER_REFLECTION_PLUGIN_H
 #define GRPCXX_EXT_PROTO_SERVER_REFLECTION_PLUGIN_H
 
-#include <grpc++/impl/server_builder_plugin.h>
-#include <grpc++/support/config.h>
-
-namespace grpc {
-class ServerInitializer;
-class ProtoServerReflection;
-}  // namespace grpc
-
-namespace grpc {
-namespace reflection {
-
-class ProtoServerReflectionPlugin : public ::grpc::ServerBuilderPlugin {
- public:
-  ProtoServerReflectionPlugin();
-  ::grpc::string name() override;
-  void InitServer(::grpc::ServerInitializer* si) override;
-  void Finish(::grpc::ServerInitializer* si) override;
-  void ChangeArguments(const ::grpc::string& name, void* value) override;
-  bool has_async_methods() const override;
-  bool has_sync_methods() const override;
-
- private:
-  std::shared_ptr<grpc::ProtoServerReflection> reflection_service_;
-};
-
-/// Add proto reflection plugin to \a ServerBuilder.
-/// This function should be called at the static initialization time.
-void InitProtoReflectionServerBuilderPlugin();
-
-}  // namespace reflection
-}  // namespace grpc
+#include <grpcpp/ext/proto_server_reflection_plugin.h>
 
 #endif  // GRPCXX_EXT_PROTO_SERVER_REFLECTION_PLUGIN_H
diff --git a/include/grpc++/generic/async_generic_service.h b/include/grpc++/generic/async_generic_service.h
index b1ea4f3909..d3283fac6f 100644
--- a/include/grpc++/generic/async_generic_service.h
+++ b/include/grpc++/generic/async_generic_service.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,63 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_GENERIC_ASYNC_GENERIC_SERVICE_H
 #define GRPCXX_GENERIC_ASYNC_GENERIC_SERVICE_H
 
-#include <grpc++/support/async_stream.h>
-#include <grpc++/support/byte_buffer.h>
-
-struct grpc_server;
-
-namespace grpc {
-
-typedef ServerAsyncReaderWriter<ByteBuffer, ByteBuffer>
-    GenericServerAsyncReaderWriter;
-
-class GenericServerContext final : public ServerContext {
- public:
-  const grpc::string& method() const { return method_; }
-  const grpc::string& host() const { return host_; }
-
- private:
-  friend class Server;
-  friend class ServerInterface;
-
-  grpc::string method_;
-  grpc::string host_;
-};
-
-// A generic service at the server side accepts all RPC methods and hosts. It is
-// typically used in proxies. The generic service can be registered to a server
-// which also has other services.
-// Sample usage:
-//   ServerBuilder builder;
-//   auto cq = builder.AddCompletionQueue();
-//   AsyncGenericService generic_service;
-//   builder.RegisterAsyncGeneicService(&generic_service);
-//   auto server = builder.BuildAndStart();
-//
-//   // request a new call
-//   GenericServerContext context;
-//   GenericAsyncReaderWriter stream;
-//   generic_service.RequestCall(&context, &stream, cq.get(), cq.get(), tag);
-//
-// When tag is retrieved from cq->Next(), context.method() can be used to look
-// at the method and the RPC can be handled accordingly.
-class AsyncGenericService final {
- public:
-  AsyncGenericService() : server_(nullptr) {}
-
-  void RequestCall(GenericServerContext* ctx,
-                   GenericServerAsyncReaderWriter* reader_writer,
-                   CompletionQueue* call_cq,
-                   ServerCompletionQueue* notification_cq, void* tag);
-
- private:
-  friend class Server;
-  Server* server_;
-};
-
-}  // namespace grpc
+#include <grpcpp/generic/async_generic_service.h>
 
 #endif  // GRPCXX_GENERIC_ASYNC_GENERIC_SERVICE_H
diff --git a/include/grpc++/generic/generic_stub.h b/include/grpc++/generic/generic_stub.h
index e72826bdc1..502953b5de 100644
--- a/include/grpc++/generic/generic_stub.h
+++ b/include/grpc++/generic/generic_stub.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,56 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_GENERIC_GENERIC_STUB_H
 #define GRPCXX_GENERIC_GENERIC_STUB_H
 
-#include <grpc++/support/async_stream.h>
-#include <grpc++/support/async_unary_call.h>
-#include <grpc++/support/byte_buffer.h>
-
-namespace grpc {
-
-class CompletionQueue;
-typedef ClientAsyncReaderWriter<ByteBuffer, ByteBuffer>
-    GenericClientAsyncReaderWriter;
-typedef ClientAsyncResponseReader<ByteBuffer> GenericClientAsyncResponseReader;
-
-/// Generic stubs provide a type-unsafe interface to call gRPC methods
-/// by name.
-class GenericStub final {
- public:
-  explicit GenericStub(std::shared_ptr<ChannelInterface> channel)
-      : channel_(channel) {}
-
-  /// Setup a call to a named method \a method using \a context, but don't
-  /// start it. Let it be started explicitly with StartCall and a tag.
-  /// The return value only indicates whether or not registration of the call
-  /// succeeded (i.e. the call won't proceed if the return value is nullptr).
-  std::unique_ptr<GenericClientAsyncReaderWriter> PrepareCall(
-      ClientContext* context, const grpc::string& method, CompletionQueue* cq);
-
-  /// Setup a unary call to a named method \a method using \a context, and don't
-  /// start it. Let it be started explicitly with StartCall.
-  /// The return value only indicates whether or not registration of the call
-  /// succeeded (i.e. the call won't proceed if the return value is nullptr).
-  std::unique_ptr<GenericClientAsyncResponseReader> PrepareUnaryCall(
-      ClientContext* context, const grpc::string& method,
-      const ByteBuffer& request, CompletionQueue* cq);
-
-  /// DEPRECATED for multi-threaded use
-  /// Begin a call to a named method \a method using \a context.
-  /// A tag \a tag will be delivered to \a cq when the call has been started
-  /// (i.e, initial metadata has been sent).
-  /// The return value only indicates whether or not registration of the call
-  /// succeeded (i.e. the call won't proceed if the return value is nullptr).
-  std::unique_ptr<GenericClientAsyncReaderWriter> Call(
-      ClientContext* context, const grpc::string& method, CompletionQueue* cq,
-      void* tag);
-
- private:
-  std::shared_ptr<ChannelInterface> channel_;
-};
-
-}  // namespace grpc
+#include <grpcpp/generic/generic_stub.h>
 
 #endif  // GRPCXX_GENERIC_GENERIC_STUB_H
diff --git a/include/grpc++/grpc++.h b/include/grpc++/grpc++.h
index 31ed436c5e..9f1d7b1bc1 100644
--- a/include/grpc++/grpc++.h
+++ b/include/grpc++/grpc++.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,53 +16,13 @@
  *
  */
 
-/// \mainpage gRPC C++ API
-///
-/// The gRPC C++ API mainly consists of the following classes:
-/// <br>
-/// - grpc::Channel, which represents the connection to an endpoint. See [the
-/// gRPC Concepts page](https://grpc.io/docs/guides/concepts.html) for more
-/// details. Channels are created by the factory function grpc::CreateChannel.
-///
-/// - grpc::CompletionQueue, the producer-consumer queue used for all
-/// asynchronous communication with the gRPC runtime.
-///
-/// - grpc::ClientContext and grpc::ServerContext, where optional configuration
-/// for an RPC can be set, such as setting custom metadata to be conveyed to the
-/// peer, compression settings, authentication, etc.
-///
-/// - grpc::Server, representing a gRPC server, created by grpc::ServerBuilder.
-///
-/// Streaming calls are handled with the streaming classes in
-/// \ref sync_stream.h and
-/// \ref async_stream.h.
-///
-/// Refer to the
-/// [examples](https://github.com/grpc/grpc/blob/master/examples/cpp)
-/// for code putting these pieces into play.
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
 
 #ifndef GRPCXX_GRPCXX_H
 #define GRPCXX_GRPCXX_H
 
-// Pragma for http://include-what-you-use.org/ tool, tells that following
-// headers are not private for grpc++.h and are part of its interface.
-// IWYU pragma: begin_exports
-#include <grpc/grpc.h>
-
-#include <grpc++/channel.h>
-#include <grpc++/client_context.h>
-#include <grpc++/completion_queue.h>
-#include <grpc++/create_channel.h>
-#include <grpc++/create_channel_posix.h>
-#include <grpc++/server.h>
-#include <grpc++/server_builder.h>
-#include <grpc++/server_context.h>
-#include <grpc++/server_posix.h>
-// IWYU pragma: end_exports
-
-namespace grpc {
-/// Return gRPC library version.
-grpc::string Version();
-}  // namespace grpc
+#include <grpcpp/grpcpp.h>
 
 #endif  // GRPCXX_GRPCXX_H
diff --git a/include/grpc++/health_check_service_interface.h b/include/grpc++/health_check_service_interface.h
index 7d4d36abb9..0cb0668e48 100644
--- a/include/grpc++/health_check_service_interface.h
+++ b/include/grpc++/health_check_service_interface.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,39 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_HEALTH_CHECK_SERVICE_INTERFACE_H
 #define GRPCXX_HEALTH_CHECK_SERVICE_INTERFACE_H
 
-#include <grpc++/support/config.h>
-
-namespace grpc {
-
-const char kHealthCheckServiceInterfaceArg[] =
-    "grpc.health_check_service_interface";
-
-/// The gRPC server uses this interface to expose the health checking service
-/// without depending on protobuf.
-class HealthCheckServiceInterface {
- public:
-  virtual ~HealthCheckServiceInterface() {}
-
-  /// Set or change the serving status of the given \a service_name.
-  virtual void SetServingStatus(const grpc::string& service_name,
-                                bool serving) = 0;
-  /// Apply to all registered service names.
-  virtual void SetServingStatus(bool serving) = 0;
-};
-
-/// Enable/disable the default health checking service. This applies to all C++
-/// servers created afterwards. For each server, user can override the default
-/// with a HealthCheckServiceServerBuilderOption.
-/// NOT thread safe.
-void EnableDefaultHealthCheckService(bool enable);
-
-/// Returns whether the default health checking service is enabled.
-/// NOT thread safe.
-bool DefaultHealthCheckServiceEnabled();
-
-}  // namespace grpc
+#include <grpcpp/health_check_service_interface.h>
 
 #endif  // GRPCXX_HEALTH_CHECK_SERVICE_INTERFACE_H
diff --git a/include/grpc++/impl/README.md b/include/grpc++/impl/README.md
deleted file mode 100644
index 612150caa0..0000000000
--- a/include/grpc++/impl/README.md
+++ /dev/null
@@ -1,4 +0,0 @@
-**The APIs in this directory are not stable!**
-
-This directory contains header files that need to be installed but are not part
-of the public API. Users should not use these headers directly.
diff --git a/include/grpc++/impl/call.h b/include/grpc++/impl/call.h
index fceaa3b0f9..b1da2b6358 100644
--- a/include/grpc++/impl/call.h
+++ b/include/grpc++/impl/call.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CALL_H
 #define GRPCXX_IMPL_CALL_H
 
-#include <grpc++/impl/codegen/call.h>
+#include <grpcpp/impl/call.h>
 
 #endif  // GRPCXX_IMPL_CALL_H
diff --git a/include/grpc++/impl/channel_argument_option.h b/include/grpc++/impl/channel_argument_option.h
index f157ec1d7e..3468378de6 100644
--- a/include/grpc++/impl/channel_argument_option.h
+++ b/include/grpc++/impl/channel_argument_option.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2017 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,22 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CHANNEL_ARGUMENT_OPTION_H
 #define GRPCXX_IMPL_CHANNEL_ARGUMENT_OPTION_H
 
-#include <map>
-#include <memory>
-
-#include <grpc++/impl/server_builder_option.h>
-#include <grpc++/support/channel_arguments.h>
-
-namespace grpc {
-
-std::unique_ptr<ServerBuilderOption> MakeChannelArgumentOption(
-    const grpc::string& name, const grpc::string& value);
-std::unique_ptr<ServerBuilderOption> MakeChannelArgumentOption(
-    const grpc::string& name, int value);
-
-}  // namespace grpc
+#include <grpcpp/impl/channel_argument_option.h>
 
 #endif  // GRPCXX_IMPL_CHANNEL_ARGUMENT_OPTION_H
diff --git a/include/grpc++/impl/client_unary_call.h b/include/grpc++/impl/client_unary_call.h
index d679727907..75e656071f 100644
--- a/include/grpc++/impl/client_unary_call.h
+++ b/include/grpc++/impl/client_unary_call.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CLIENT_UNARY_CALL_H
 #define GRPCXX_IMPL_CLIENT_UNARY_CALL_H
 
-#include <grpc++/impl/codegen/client_unary_call.h>
+#include <grpcpp/impl/client_unary_call.h>
 
 #endif  // GRPCXX_IMPL_CLIENT_UNARY_CALL_H
diff --git a/include/grpc++/impl/codegen/async_stream.h b/include/grpc++/impl/codegen/async_stream.h
index 4476033463..a034470a70 100644
--- a/include/grpc++/impl/codegen/async_stream.h
+++ b/include/grpc++/impl/codegen/async_stream.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,1053 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_ASYNC_STREAM_H
 #define GRPCXX_IMPL_CODEGEN_ASYNC_STREAM_H
 
-#include <grpc++/impl/codegen/call.h>
-#include <grpc++/impl/codegen/channel_interface.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/server_context.h>
-#include <grpc++/impl/codegen/service_type.h>
-#include <grpc++/impl/codegen/status.h>
-
-namespace grpc {
-
-class CompletionQueue;
-
-namespace internal {
-/// Common interface for all client side asynchronous streaming.
-class ClientAsyncStreamingInterface {
- public:
-  virtual ~ClientAsyncStreamingInterface() {}
-
-  /// Start the call that was set up by the constructor, but only if the
-  /// constructor was invoked through the "Prepare" API which doesn't actually
-  /// start the call
-  virtual void StartCall(void* tag) = 0;
-
-  /// Request notification of the reading of the initial metadata. Completion
-  /// will be notified by \a tag on the associated completion queue.
-  /// This call is optional, but if it is used, it cannot be used concurrently
-  /// with or after the \a AsyncReaderInterface::Read method.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  virtual void ReadInitialMetadata(void* tag) = 0;
-
-  /// Indicate that the stream is to be finished and request notification for
-  /// when the call has been ended.
-  /// Should not be used concurrently with other operations.
-  ///
-  /// It is appropriate to call this method when both:
-  ///   * the client side has no more message to send
-  ///     (this can be declared implicitly by calling this method, or
-  ///     explicitly through an earlier call to the <i>WritesDone</i> method
-  ///     of the class in use, e.g. \a ClientAsyncWriterInterface::WritesDone or
-  ///     \a ClientAsyncReaderWriterInterface::WritesDone).
-  ///   * there are no more messages to be received from the server (this can
-  ///     be known implicitly by the calling code, or explicitly from an
-  ///     earlier call to \a AsyncReaderInterface::Read that yielded a failed
-  ///     result, e.g. cq->Next(&read_tag, &ok) filled in 'ok' with 'false').
-  ///
-  /// This function will return when either:
-  /// - all incoming messages have been read and the server has returned
-  ///   a status.
-  /// - the server has returned a non-OK status.
-  /// - the call failed for some reason and the library generated a
-  ///   status.
-  ///
-  /// Note that implementations of this method attempt to receive initial
-  /// metadata from the server if initial metadata hasn't yet been received.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  /// \param[out] status To be updated with the operation status.
-  virtual void Finish(Status* status, void* tag) = 0;
-};
-
-/// An interface that yields a sequence of messages of type \a R.
-template <class R>
-class AsyncReaderInterface {
- public:
-  virtual ~AsyncReaderInterface() {}
-
-  /// Read a message of type \a R into \a msg. Completion will be notified by \a
-  /// tag on the associated completion queue.
-  /// This is thread-safe with respect to \a Write or \a WritesDone methods. It
-  /// should not be called concurrently with other streaming APIs
-  /// on the same stream. It is not meaningful to call it concurrently
-  /// with another \a AsyncReaderInterface::Read on the same stream since reads
-  /// on the same stream are delivered in order.
-  ///
-  /// \param[out] msg Where to eventually store the read message.
-  /// \param[in] tag The tag identifying the operation.
-  ///
-  /// Side effect: note that this method attempt to receive initial metadata for
-  /// a stream if it hasn't yet been received.
-  virtual void Read(R* msg, void* tag) = 0;
-};
-
-/// An interface that can be fed a sequence of messages of type \a W.
-template <class W>
-class AsyncWriterInterface {
- public:
-  virtual ~AsyncWriterInterface() {}
-
-  /// Request the writing of \a msg with identifying tag \a tag.
-  ///
-  /// Only one write may be outstanding at any given time. This means that
-  /// after calling Write, one must wait to receive \a tag from the completion
-  /// queue BEFORE calling Write again.
-  /// This is thread-safe with respect to \a AsyncReaderInterface::Read
-  ///
-  /// \param[in] msg The message to be written.
-  /// \param[in] tag The tag identifying the operation.
-  virtual void Write(const W& msg, void* tag) = 0;
-
-  /// Request the writing of \a msg using WriteOptions \a options with
-  /// identifying tag \a tag.
-  ///
-  /// Only one write may be outstanding at any given time. This means that
-  /// after calling Write, one must wait to receive \a tag from the completion
-  /// queue BEFORE calling Write again.
-  /// WriteOptions \a options is used to set the write options of this message.
-  /// This is thread-safe with respect to \a AsyncReaderInterface::Read
-  ///
-  /// \param[in] msg The message to be written.
-  /// \param[in] options The WriteOptions to be used to write this message.
-  /// \param[in] tag The tag identifying the operation.
-  virtual void Write(const W& msg, WriteOptions options, void* tag) = 0;
-
-  /// Request the writing of \a msg and coalesce it with the writing
-  /// of trailing metadata, using WriteOptions \a options with
-  /// identifying tag \a tag.
-  ///
-  /// For client, WriteLast is equivalent of performing Write and
-  /// WritesDone in a single step.
-  /// For server, WriteLast buffers the \a msg. The writing of \a msg is held
-  /// until Finish is called, where \a msg and trailing metadata are coalesced
-  /// and write is initiated. Note that WriteLast can only buffer \a msg up to
-  /// the flow control window size. If \a msg size is larger than the window
-  /// size, it will be sent on wire without buffering.
-  ///
-  /// \param[in] msg The message to be written.
-  /// \param[in] options The WriteOptions to be used to write this message.
-  /// \param[in] tag The tag identifying the operation.
-  void WriteLast(const W& msg, WriteOptions options, void* tag) {
-    Write(msg, options.set_last_message(), tag);
-  }
-};
-
-}  // namespace internal
-
-template <class R>
-class ClientAsyncReaderInterface
-    : public internal::ClientAsyncStreamingInterface,
-      public internal::AsyncReaderInterface<R> {};
-
-namespace internal {
-template <class R>
-class ClientAsyncReaderFactory {
- public:
-  /// Create a stream object.
-  /// Write the first request out if \a start is set.
-  /// \a tag will be notified on \a cq when the call has been started and
-  /// \a request has been written out. If \a start is not set, \a tag must be
-  /// nullptr and the actual call must be initiated by StartCall
-  /// Note that \a context will be used to fill in custom initial metadata
-  /// used to send to the server when starting the call.
-  template <class W>
-  static ClientAsyncReader<R>* Create(ChannelInterface* channel,
-                                      CompletionQueue* cq,
-                                      const ::grpc::internal::RpcMethod& method,
-                                      ClientContext* context, const W& request,
-                                      bool start, void* tag) {
-    ::grpc::internal::Call call = channel->CreateCall(method, context, cq);
-    return new (g_core_codegen_interface->grpc_call_arena_alloc(
-        call.call(), sizeof(ClientAsyncReader<R>)))
-        ClientAsyncReader<R>(call, context, request, start, tag);
-  }
-};
-}  // namespace internal
-
-/// Async client-side API for doing server-streaming RPCs,
-/// where the incoming message stream coming from the server has
-/// messages of type \a R.
-template <class R>
-class ClientAsyncReader final : public ClientAsyncReaderInterface<R> {
- public:
-  // always allocated against a call arena, no memory free required
-  static void operator delete(void* ptr, std::size_t size) {
-    assert(size == sizeof(ClientAsyncReader));
-  }
-
-  void StartCall(void* tag) override {
-    assert(!started_);
-    started_ = true;
-    StartCallInternal(tag);
-  }
-
-  /// See the \a ClientAsyncStreamingInterface.ReadInitialMetadata
-  /// method for semantics.
-  ///
-  /// Side effect:
-  ///   - upon receiving initial metadata from the server,
-  ///     the \a ClientContext associated with this call is updated, and the
-  ///     calling code can access the received metadata through the
-  ///     \a ClientContext.
-  void ReadInitialMetadata(void* tag) override {
-    assert(started_);
-    GPR_CODEGEN_ASSERT(!context_->initial_metadata_received_);
-
-    meta_ops_.set_output_tag(tag);
-    meta_ops_.RecvInitialMetadata(context_);
-    call_.PerformOps(&meta_ops_);
-  }
-
-  void Read(R* msg, void* tag) override {
-    assert(started_);
-    read_ops_.set_output_tag(tag);
-    if (!context_->initial_metadata_received_) {
-      read_ops_.RecvInitialMetadata(context_);
-    }
-    read_ops_.RecvMessage(msg);
-    call_.PerformOps(&read_ops_);
-  }
-
-  /// See the \a ClientAsyncStreamingInterface.Finish method for semantics.
-  ///
-  /// Side effect:
-  ///   - the \a ClientContext associated with this call is updated with
-  ///     possible initial and trailing metadata received from the server.
-  void Finish(Status* status, void* tag) override {
-    assert(started_);
-    finish_ops_.set_output_tag(tag);
-    if (!context_->initial_metadata_received_) {
-      finish_ops_.RecvInitialMetadata(context_);
-    }
-    finish_ops_.ClientRecvStatus(context_, status);
-    call_.PerformOps(&finish_ops_);
-  }
-
- private:
-  friend class internal::ClientAsyncReaderFactory<R>;
-  template <class W>
-  ClientAsyncReader(::grpc::internal::Call call, ClientContext* context,
-                    const W& request, bool start, void* tag)
-      : context_(context), call_(call), started_(start) {
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(init_ops_.SendMessage(request).ok());
-    init_ops_.ClientSendClose();
-    if (start) {
-      StartCallInternal(tag);
-    } else {
-      assert(tag == nullptr);
-    }
-  }
-
-  void StartCallInternal(void* tag) {
-    init_ops_.SendInitialMetadata(context_->send_initial_metadata_,
-                                  context_->initial_metadata_flags());
-    init_ops_.set_output_tag(tag);
-    call_.PerformOps(&init_ops_);
-  }
-
-  ClientContext* context_;
-  ::grpc::internal::Call call_;
-  bool started_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpSendMessage,
-                              ::grpc::internal::CallOpClientSendClose>
-      init_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata>
-      meta_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                              ::grpc::internal::CallOpRecvMessage<R>>
-      read_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                              ::grpc::internal::CallOpClientRecvStatus>
-      finish_ops_;
-};
-
-/// Common interface for client side asynchronous writing.
-template <class W>
-class ClientAsyncWriterInterface
-    : public internal::ClientAsyncStreamingInterface,
-      public internal::AsyncWriterInterface<W> {
- public:
-  /// Signal the client is done with the writes (half-close the client stream).
-  /// Thread-safe with respect to \a AsyncReaderInterface::Read
-  ///
-  /// \param[in] tag The tag identifying the operation.
-  virtual void WritesDone(void* tag) = 0;
-};
-
-namespace internal {
-template <class W>
-class ClientAsyncWriterFactory {
- public:
-  /// Create a stream object.
-  /// Start the RPC if \a start is set
-  /// \a tag will be notified on \a cq when the call has been started (i.e.
-  /// intitial metadata sent) and \a request has been written out.
-  /// If \a start is not set, \a tag must be nullptr and the actual call
-  /// must be initiated by StartCall
-  /// Note that \a context will be used to fill in custom initial metadata
-  /// used to send to the server when starting the call.
-  /// \a response will be filled in with the single expected response
-  /// message from the server upon a successful call to the \a Finish
-  /// method of this instance.
-  template <class R>
-  static ClientAsyncWriter<W>* Create(ChannelInterface* channel,
-                                      CompletionQueue* cq,
-                                      const ::grpc::internal::RpcMethod& method,
-                                      ClientContext* context, R* response,
-                                      bool start, void* tag) {
-    ::grpc::internal::Call call = channel->CreateCall(method, context, cq);
-    return new (g_core_codegen_interface->grpc_call_arena_alloc(
-        call.call(), sizeof(ClientAsyncWriter<W>)))
-        ClientAsyncWriter<W>(call, context, response, start, tag);
-  }
-};
-}  // namespace internal
-
-/// Async API on the client side for doing client-streaming RPCs,
-/// where the outgoing message stream going to the server contains
-/// messages of type \a W.
-template <class W>
-class ClientAsyncWriter final : public ClientAsyncWriterInterface<W> {
- public:
-  // always allocated against a call arena, no memory free required
-  static void operator delete(void* ptr, std::size_t size) {
-    assert(size == sizeof(ClientAsyncWriter));
-  }
-
-  void StartCall(void* tag) override {
-    assert(!started_);
-    started_ = true;
-    StartCallInternal(tag);
-  }
-
-  /// See the \a ClientAsyncStreamingInterface.ReadInitialMetadata method for
-  /// semantics.
-  ///
-  /// Side effect:
-  ///   - upon receiving initial metadata from the server, the \a ClientContext
-  ///     associated with this call is updated, and the calling code can access
-  ///     the received metadata through the \a ClientContext.
-  void ReadInitialMetadata(void* tag) override {
-    assert(started_);
-    GPR_CODEGEN_ASSERT(!context_->initial_metadata_received_);
-
-    meta_ops_.set_output_tag(tag);
-    meta_ops_.RecvInitialMetadata(context_);
-    call_.PerformOps(&meta_ops_);
-  }
-
-  void Write(const W& msg, void* tag) override {
-    assert(started_);
-    write_ops_.set_output_tag(tag);
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg).ok());
-    call_.PerformOps(&write_ops_);
-  }
-
-  void Write(const W& msg, WriteOptions options, void* tag) override {
-    assert(started_);
-    write_ops_.set_output_tag(tag);
-    if (options.is_last_message()) {
-      options.set_buffer_hint();
-      write_ops_.ClientSendClose();
-    }
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg, options).ok());
-    call_.PerformOps(&write_ops_);
-  }
-
-  void WritesDone(void* tag) override {
-    assert(started_);
-    write_ops_.set_output_tag(tag);
-    write_ops_.ClientSendClose();
-    call_.PerformOps(&write_ops_);
-  }
-
-  /// See the \a ClientAsyncStreamingInterface.Finish method for semantics.
-  ///
-  /// Side effect:
-  ///   - the \a ClientContext associated with this call is updated with
-  ///     possible initial and trailing metadata received from the server.
-  ///   - attempts to fill in the \a response parameter passed to this class's
-  ///     constructor with the server's response message.
-  void Finish(Status* status, void* tag) override {
-    assert(started_);
-    finish_ops_.set_output_tag(tag);
-    if (!context_->initial_metadata_received_) {
-      finish_ops_.RecvInitialMetadata(context_);
-    }
-    finish_ops_.ClientRecvStatus(context_, status);
-    call_.PerformOps(&finish_ops_);
-  }
-
- private:
-  friend class internal::ClientAsyncWriterFactory<W>;
-  template <class R>
-  ClientAsyncWriter(::grpc::internal::Call call, ClientContext* context,
-                    R* response, bool start, void* tag)
-      : context_(context), call_(call), started_(start) {
-    finish_ops_.RecvMessage(response);
-    finish_ops_.AllowNoMessage();
-    if (start) {
-      StartCallInternal(tag);
-    } else {
-      assert(tag == nullptr);
-    }
-  }
-
-  void StartCallInternal(void* tag) {
-    write_ops_.SendInitialMetadata(context_->send_initial_metadata_,
-                                   context_->initial_metadata_flags());
-    // if corked bit is set in context, we just keep the initial metadata
-    // buffered up to coalesce with later message send. No op is performed.
-    if (!context_->initial_metadata_corked_) {
-      write_ops_.set_output_tag(tag);
-      call_.PerformOps(&write_ops_);
-    }
-  }
-
-  ClientContext* context_;
-  ::grpc::internal::Call call_;
-  bool started_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata>
-      meta_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpSendMessage,
-                              ::grpc::internal::CallOpClientSendClose>
-      write_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                              ::grpc::internal::CallOpGenericRecvMessage,
-                              ::grpc::internal::CallOpClientRecvStatus>
-      finish_ops_;
-};
-
-/// Async client-side interface for bi-directional streaming,
-/// where the client-to-server message stream has messages of type \a W,
-/// and the server-to-client message stream has messages of type \a R.
-template <class W, class R>
-class ClientAsyncReaderWriterInterface
-    : public internal::ClientAsyncStreamingInterface,
-      public internal::AsyncWriterInterface<W>,
-      public internal::AsyncReaderInterface<R> {
- public:
-  /// Signal the client is done with the writes (half-close the client stream).
-  /// Thread-safe with respect to \a AsyncReaderInterface::Read
-  ///
-  /// \param[in] tag The tag identifying the operation.
-  virtual void WritesDone(void* tag) = 0;
-};
-
-namespace internal {
-template <class W, class R>
-class ClientAsyncReaderWriterFactory {
- public:
-  /// Create a stream object.
-  /// Start the RPC request if \a start is set.
-  /// \a tag will be notified on \a cq when the call has been started (i.e.
-  /// intitial metadata sent). If \a start is not set, \a tag must be
-  /// nullptr and the actual call must be initiated by StartCall
-  /// Note that \a context will be used to fill in custom initial metadata
-  /// used to send to the server when starting the call.
-  static ClientAsyncReaderWriter<W, R>* Create(
-      ChannelInterface* channel, CompletionQueue* cq,
-      const ::grpc::internal::RpcMethod& method, ClientContext* context,
-      bool start, void* tag) {
-    ::grpc::internal::Call call = channel->CreateCall(method, context, cq);
-
-    return new (g_core_codegen_interface->grpc_call_arena_alloc(
-        call.call(), sizeof(ClientAsyncReaderWriter<W, R>)))
-        ClientAsyncReaderWriter<W, R>(call, context, start, tag);
-  }
-};
-}  // namespace internal
-
-/// Async client-side interface for bi-directional streaming,
-/// where the outgoing message stream going to the server
-/// has messages of type \a W,  and the incoming message stream coming
-/// from the server has messages of type \a R.
-template <class W, class R>
-class ClientAsyncReaderWriter final
-    : public ClientAsyncReaderWriterInterface<W, R> {
- public:
-  // always allocated against a call arena, no memory free required
-  static void operator delete(void* ptr, std::size_t size) {
-    assert(size == sizeof(ClientAsyncReaderWriter));
-  }
-
-  void StartCall(void* tag) override {
-    assert(!started_);
-    started_ = true;
-    StartCallInternal(tag);
-  }
-
-  /// See the \a ClientAsyncStreamingInterface.ReadInitialMetadata method
-  /// for semantics of this method.
-  ///
-  /// Side effect:
-  ///   - upon receiving initial metadata from the server, the \a ClientContext
-  ///     is updated with it, and then the receiving initial metadata can
-  ///     be accessed through this \a ClientContext.
-  void ReadInitialMetadata(void* tag) override {
-    assert(started_);
-    GPR_CODEGEN_ASSERT(!context_->initial_metadata_received_);
-
-    meta_ops_.set_output_tag(tag);
-    meta_ops_.RecvInitialMetadata(context_);
-    call_.PerformOps(&meta_ops_);
-  }
-
-  void Read(R* msg, void* tag) override {
-    assert(started_);
-    read_ops_.set_output_tag(tag);
-    if (!context_->initial_metadata_received_) {
-      read_ops_.RecvInitialMetadata(context_);
-    }
-    read_ops_.RecvMessage(msg);
-    call_.PerformOps(&read_ops_);
-  }
-
-  void Write(const W& msg, void* tag) override {
-    assert(started_);
-    write_ops_.set_output_tag(tag);
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg).ok());
-    call_.PerformOps(&write_ops_);
-  }
-
-  void Write(const W& msg, WriteOptions options, void* tag) override {
-    assert(started_);
-    write_ops_.set_output_tag(tag);
-    if (options.is_last_message()) {
-      options.set_buffer_hint();
-      write_ops_.ClientSendClose();
-    }
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg, options).ok());
-    call_.PerformOps(&write_ops_);
-  }
-
-  void WritesDone(void* tag) override {
-    assert(started_);
-    write_ops_.set_output_tag(tag);
-    write_ops_.ClientSendClose();
-    call_.PerformOps(&write_ops_);
-  }
-
-  /// See the \a ClientAsyncStreamingInterface.Finish method for semantics.
-  /// Side effect
-  ///   - the \a ClientContext associated with this call is updated with
-  ///     possible initial and trailing metadata sent from the server.
-  void Finish(Status* status, void* tag) override {
-    assert(started_);
-    finish_ops_.set_output_tag(tag);
-    if (!context_->initial_metadata_received_) {
-      finish_ops_.RecvInitialMetadata(context_);
-    }
-    finish_ops_.ClientRecvStatus(context_, status);
-    call_.PerformOps(&finish_ops_);
-  }
-
- private:
-  friend class internal::ClientAsyncReaderWriterFactory<W, R>;
-  ClientAsyncReaderWriter(::grpc::internal::Call call, ClientContext* context,
-                          bool start, void* tag)
-      : context_(context), call_(call), started_(start) {
-    if (start) {
-      StartCallInternal(tag);
-    } else {
-      assert(tag == nullptr);
-    }
-  }
-
-  void StartCallInternal(void* tag) {
-    write_ops_.SendInitialMetadata(context_->send_initial_metadata_,
-                                   context_->initial_metadata_flags());
-    // if corked bit is set in context, we just keep the initial metadata
-    // buffered up to coalesce with later message send. No op is performed.
-    if (!context_->initial_metadata_corked_) {
-      write_ops_.set_output_tag(tag);
-      call_.PerformOps(&write_ops_);
-    }
-  }
-
-  ClientContext* context_;
-  ::grpc::internal::Call call_;
-  bool started_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata>
-      meta_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                              ::grpc::internal::CallOpRecvMessage<R>>
-      read_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpSendMessage,
-                              ::grpc::internal::CallOpClientSendClose>
-      write_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                              ::grpc::internal::CallOpClientRecvStatus>
-      finish_ops_;
-};
-
-template <class W, class R>
-class ServerAsyncReaderInterface
-    : public internal::ServerAsyncStreamingInterface,
-      public internal::AsyncReaderInterface<R> {
- public:
-  /// Indicate that the stream is to be finished with a certain status code
-  /// and also send out \a msg response to the client.
-  /// Request notification for when the server has sent the response and the
-  /// appropriate signals to the client to end the call.
-  /// Should not be used concurrently with other operations.
-  ///
-  /// It is appropriate to call this method when:
-  ///   * all messages from the client have been received (either known
-  ///     implictly, or explicitly because a previous
-  ///     \a AsyncReaderInterface::Read operation with a non-ok result,
-  ///     e.g., cq->Next(&read_tag, &ok) filled in 'ok' with 'false').
-  ///
-  /// This operation will end when the server has finished sending out initial
-  /// metadata (if not sent already), response message, and status, or if
-  /// some failure occurred when trying to do so.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  /// \param[in] status To be sent to the client as the result of this call.
-  /// \param[in] msg To be sent to the client as the response for this call.
-  virtual void Finish(const W& msg, const Status& status, void* tag) = 0;
-
-  /// Indicate that the stream is to be finished with a certain
-  /// non-OK status code.
-  /// Request notification for when the server has sent the appropriate
-  /// signals to the client to end the call.
-  /// Should not be used concurrently with other operations.
-  ///
-  /// This call is meant to end the call with some error, and can be called at
-  /// any point that the server would like to "fail" the call (though note
-  /// this shouldn't be called concurrently with any other "sending" call, like
-  /// \a AsyncWriterInterface::Write).
-  ///
-  /// This operation will end when the server has finished sending out initial
-  /// metadata (if not sent already), and status, or if some failure occurred
-  /// when trying to do so.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  /// \param[in] status To be sent to the client as the result of this call.
-  ///     - Note: \a status must have a non-OK code.
-  virtual void FinishWithError(const Status& status, void* tag) = 0;
-};
-
-/// Async server-side API for doing client-streaming RPCs,
-/// where the incoming message stream from the client has messages of type \a R,
-/// and the single response message sent from the server is type \a W.
-template <class W, class R>
-class ServerAsyncReader final : public ServerAsyncReaderInterface<W, R> {
- public:
-  explicit ServerAsyncReader(ServerContext* ctx)
-      : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
-
-  /// See \a ServerAsyncStreamingInterface::SendInitialMetadata for semantics.
-  ///
-  /// Implicit input parameter:
-  ///   - The initial metadata that will be sent to the client from this op will
-  ///     be taken from the \a ServerContext associated with the call.
-  void SendInitialMetadata(void* tag) override {
-    GPR_CODEGEN_ASSERT(!ctx_->sent_initial_metadata_);
-
-    meta_ops_.set_output_tag(tag);
-    meta_ops_.SendInitialMetadata(ctx_->initial_metadata_,
-                                  ctx_->initial_metadata_flags());
-    if (ctx_->compression_level_set()) {
-      meta_ops_.set_compression_level(ctx_->compression_level());
-    }
-    ctx_->sent_initial_metadata_ = true;
-    call_.PerformOps(&meta_ops_);
-  }
-
-  void Read(R* msg, void* tag) override {
-    read_ops_.set_output_tag(tag);
-    read_ops_.RecvMessage(msg);
-    call_.PerformOps(&read_ops_);
-  }
-
-  /// See the \a ServerAsyncReaderInterface.Read method for semantics
-  ///
-  /// Side effect:
-  ///   - also sends initial metadata if not alreay sent.
-  ///   - uses the \a ServerContext associated with this call to send possible
-  ///     initial and trailing metadata.
-  ///
-  /// Note: \a msg is not sent if \a status has a non-OK code.
-  void Finish(const W& msg, const Status& status, void* tag) override {
-    finish_ops_.set_output_tag(tag);
-    if (!ctx_->sent_initial_metadata_) {
-      finish_ops_.SendInitialMetadata(ctx_->initial_metadata_,
-                                      ctx_->initial_metadata_flags());
-      if (ctx_->compression_level_set()) {
-        finish_ops_.set_compression_level(ctx_->compression_level());
-      }
-      ctx_->sent_initial_metadata_ = true;
-    }
-    // The response is dropped if the status is not OK.
-    if (status.ok()) {
-      finish_ops_.ServerSendStatus(ctx_->trailing_metadata_,
-                                   finish_ops_.SendMessage(msg));
-    } else {
-      finish_ops_.ServerSendStatus(ctx_->trailing_metadata_, status);
-    }
-    call_.PerformOps(&finish_ops_);
-  }
-
-  /// See the \a ServerAsyncReaderInterface.Read method for semantics
-  ///
-  /// Side effect:
-  ///   - also sends initial metadata if not alreay sent.
-  ///   - uses the \a ServerContext associated with this call to send possible
-  ///     initial and trailing metadata.
-  void FinishWithError(const Status& status, void* tag) override {
-    GPR_CODEGEN_ASSERT(!status.ok());
-    finish_ops_.set_output_tag(tag);
-    if (!ctx_->sent_initial_metadata_) {
-      finish_ops_.SendInitialMetadata(ctx_->initial_metadata_,
-                                      ctx_->initial_metadata_flags());
-      if (ctx_->compression_level_set()) {
-        finish_ops_.set_compression_level(ctx_->compression_level());
-      }
-      ctx_->sent_initial_metadata_ = true;
-    }
-    finish_ops_.ServerSendStatus(ctx_->trailing_metadata_, status);
-    call_.PerformOps(&finish_ops_);
-  }
-
- private:
-  void BindCall(::grpc::internal::Call* call) override { call_ = *call; }
-
-  ::grpc::internal::Call call_;
-  ServerContext* ctx_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata>
-      meta_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvMessage<R>> read_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpSendMessage,
-                              ::grpc::internal::CallOpServerSendStatus>
-      finish_ops_;
-};
-
-template <class W>
-class ServerAsyncWriterInterface
-    : public internal::ServerAsyncStreamingInterface,
-      public internal::AsyncWriterInterface<W> {
- public:
-  /// Indicate that the stream is to be finished with a certain status code.
-  /// Request notification for when the server has sent the appropriate
-  /// signals to the client to end the call.
-  /// Should not be used concurrently with other operations.
-  ///
-  /// It is appropriate to call this method when either:
-  ///   * all messages from the client have been received (either known
-  ///     implictly, or explicitly because a previous \a
-  ///     AsyncReaderInterface::Read operation with a non-ok
-  ///     result (e.g., cq->Next(&read_tag, &ok) filled in 'ok' with 'false'.
-  ///   * it is desired to end the call early with some non-OK status code.
-  ///
-  /// This operation will end when the server has finished sending out initial
-  /// metadata (if not sent already), response message, and status, or if
-  /// some failure occurred when trying to do so.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  /// \param[in] status To be sent to the client as the result of this call.
-  virtual void Finish(const Status& status, void* tag) = 0;
-
-  /// Request the writing of \a msg and coalesce it with trailing metadata which
-  /// contains \a status, using WriteOptions options with
-  /// identifying tag \a tag.
-  ///
-  /// WriteAndFinish is equivalent of performing WriteLast and Finish
-  /// in a single step.
-  ///
-  /// \param[in] msg The message to be written.
-  /// \param[in] options The WriteOptions to be used to write this message.
-  /// \param[in] status The Status that server returns to client.
-  /// \param[in] tag The tag identifying the operation.
-  virtual void WriteAndFinish(const W& msg, WriteOptions options,
-                              const Status& status, void* tag) = 0;
-};
-
-/// Async server-side API for doing server streaming RPCs,
-/// where the outgoing message stream from the server has messages of type \a W.
-template <class W>
-class ServerAsyncWriter final : public ServerAsyncWriterInterface<W> {
- public:
-  explicit ServerAsyncWriter(ServerContext* ctx)
-      : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
-
-  /// See \a ServerAsyncStreamingInterface::SendInitialMetadata for semantics.
-  ///
-  /// Implicit input parameter:
-  ///   - The initial metadata that will be sent to the client from this op will
-  ///     be taken from the \a ServerContext associated with the call.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  void SendInitialMetadata(void* tag) override {
-    GPR_CODEGEN_ASSERT(!ctx_->sent_initial_metadata_);
-
-    meta_ops_.set_output_tag(tag);
-    meta_ops_.SendInitialMetadata(ctx_->initial_metadata_,
-                                  ctx_->initial_metadata_flags());
-    if (ctx_->compression_level_set()) {
-      meta_ops_.set_compression_level(ctx_->compression_level());
-    }
-    ctx_->sent_initial_metadata_ = true;
-    call_.PerformOps(&meta_ops_);
-  }
-
-  void Write(const W& msg, void* tag) override {
-    write_ops_.set_output_tag(tag);
-    EnsureInitialMetadataSent(&write_ops_);
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg).ok());
-    call_.PerformOps(&write_ops_);
-  }
-
-  void Write(const W& msg, WriteOptions options, void* tag) override {
-    write_ops_.set_output_tag(tag);
-    if (options.is_last_message()) {
-      options.set_buffer_hint();
-    }
-
-    EnsureInitialMetadataSent(&write_ops_);
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg, options).ok());
-    call_.PerformOps(&write_ops_);
-  }
-
-  /// See the \a ServerAsyncWriterInterface.WriteAndFinish method for semantics.
-  ///
-  /// Implicit input parameter:
-  ///   - the \a ServerContext associated with this call is used
-  ///     for sending trailing (and initial) metadata to the client.
-  ///
-  /// Note: \a status must have an OK code.
-  void WriteAndFinish(const W& msg, WriteOptions options, const Status& status,
-                      void* tag) override {
-    write_ops_.set_output_tag(tag);
-    EnsureInitialMetadataSent(&write_ops_);
-    options.set_buffer_hint();
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg, options).ok());
-    write_ops_.ServerSendStatus(ctx_->trailing_metadata_, status);
-    call_.PerformOps(&write_ops_);
-  }
-
-  /// See the \a ServerAsyncWriterInterface.Finish method for semantics.
-  ///
-  /// Implicit input parameter:
-  ///   - the \a ServerContext associated with this call is used for sending
-  ///     trailing (and initial if not already sent) metadata to the client.
-  ///
-  /// Note: there are no restrictions are the code of
-  /// \a status,it may be non-OK
-  void Finish(const Status& status, void* tag) override {
-    finish_ops_.set_output_tag(tag);
-    EnsureInitialMetadataSent(&finish_ops_);
-    finish_ops_.ServerSendStatus(ctx_->trailing_metadata_, status);
-    call_.PerformOps(&finish_ops_);
-  }
-
- private:
-  void BindCall(::grpc::internal::Call* call) override { call_ = *call; }
-
-  template <class T>
-  void EnsureInitialMetadataSent(T* ops) {
-    if (!ctx_->sent_initial_metadata_) {
-      ops->SendInitialMetadata(ctx_->initial_metadata_,
-                               ctx_->initial_metadata_flags());
-      if (ctx_->compression_level_set()) {
-        ops->set_compression_level(ctx_->compression_level());
-      }
-      ctx_->sent_initial_metadata_ = true;
-    }
-  }
-
-  ::grpc::internal::Call call_;
-  ServerContext* ctx_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata>
-      meta_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpSendMessage,
-                              ::grpc::internal::CallOpServerSendStatus>
-      write_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpServerSendStatus>
-      finish_ops_;
-};
-
-/// Server-side interface for asynchronous bi-directional streaming.
-template <class W, class R>
-class ServerAsyncReaderWriterInterface
-    : public internal::ServerAsyncStreamingInterface,
-      public internal::AsyncWriterInterface<W>,
-      public internal::AsyncReaderInterface<R> {
- public:
-  /// Indicate that the stream is to be finished with a certain status code.
-  /// Request notification for when the server has sent the appropriate
-  /// signals to the client to end the call.
-  /// Should not be used concurrently with other operations.
-  ///
-  /// It is appropriate to call this method when either:
-  ///   * all messages from the client have been received (either known
-  ///     implictly, or explicitly because a previous \a
-  ///     AsyncReaderInterface::Read operation
-  ///     with a non-ok result (e.g., cq->Next(&read_tag, &ok) filled in 'ok'
-  ///     with 'false'.
-  ///   * it is desired to end the call early with some non-OK status code.
-  ///
-  /// This operation will end when the server has finished sending out initial
-  /// metadata (if not sent already), response message, and status, or if some
-  /// failure occurred when trying to do so.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  /// \param[in] status To be sent to the client as the result of this call.
-  virtual void Finish(const Status& status, void* tag) = 0;
-
-  /// Request the writing of \a msg and coalesce it with trailing metadata which
-  /// contains \a status, using WriteOptions options with
-  /// identifying tag \a tag.
-  ///
-  /// WriteAndFinish is equivalent of performing WriteLast and Finish in a
-  /// single step.
-  ///
-  /// \param[in] msg The message to be written.
-  /// \param[in] options The WriteOptions to be used to write this message.
-  /// \param[in] status The Status that server returns to client.
-  /// \param[in] tag The tag identifying the operation.
-  virtual void WriteAndFinish(const W& msg, WriteOptions options,
-                              const Status& status, void* tag) = 0;
-};
-
-/// Async server-side API for doing bidirectional streaming RPCs,
-/// where the incoming message stream coming from the client has messages of
-/// type \a R, and the outgoing message stream coming from the server has
-/// messages of type \a W.
-template <class W, class R>
-class ServerAsyncReaderWriter final
-    : public ServerAsyncReaderWriterInterface<W, R> {
- public:
-  explicit ServerAsyncReaderWriter(ServerContext* ctx)
-      : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
-
-  /// See \a ServerAsyncStreamingInterface::SendInitialMetadata for semantics.
-  ///
-  /// Implicit input parameter:
-  ///   - The initial metadata that will be sent to the client from this op will
-  ///     be taken from the \a ServerContext associated with the call.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  void SendInitialMetadata(void* tag) override {
-    GPR_CODEGEN_ASSERT(!ctx_->sent_initial_metadata_);
-
-    meta_ops_.set_output_tag(tag);
-    meta_ops_.SendInitialMetadata(ctx_->initial_metadata_,
-                                  ctx_->initial_metadata_flags());
-    if (ctx_->compression_level_set()) {
-      meta_ops_.set_compression_level(ctx_->compression_level());
-    }
-    ctx_->sent_initial_metadata_ = true;
-    call_.PerformOps(&meta_ops_);
-  }
-
-  void Read(R* msg, void* tag) override {
-    read_ops_.set_output_tag(tag);
-    read_ops_.RecvMessage(msg);
-    call_.PerformOps(&read_ops_);
-  }
-
-  void Write(const W& msg, void* tag) override {
-    write_ops_.set_output_tag(tag);
-    EnsureInitialMetadataSent(&write_ops_);
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg).ok());
-    call_.PerformOps(&write_ops_);
-  }
-
-  void Write(const W& msg, WriteOptions options, void* tag) override {
-    write_ops_.set_output_tag(tag);
-    if (options.is_last_message()) {
-      options.set_buffer_hint();
-    }
-    EnsureInitialMetadataSent(&write_ops_);
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg, options).ok());
-    call_.PerformOps(&write_ops_);
-  }
-
-  /// See the \a ServerAsyncReaderWriterInterface.WriteAndFinish
-  /// method for semantics.
-  ///
-  /// Implicit input parameter:
-  ///   - the \a ServerContext associated with this call is used
-  ///     for sending trailing (and initial) metadata to the client.
-  ///
-  /// Note: \a status must have an OK code.
-  void WriteAndFinish(const W& msg, WriteOptions options, const Status& status,
-                      void* tag) override {
-    write_ops_.set_output_tag(tag);
-    EnsureInitialMetadataSent(&write_ops_);
-    options.set_buffer_hint();
-    GPR_CODEGEN_ASSERT(write_ops_.SendMessage(msg, options).ok());
-    write_ops_.ServerSendStatus(ctx_->trailing_metadata_, status);
-    call_.PerformOps(&write_ops_);
-  }
-
-  /// See the \a ServerAsyncReaderWriterInterface.Finish method for semantics.
-  ///
-  /// Implicit input parameter:
-  ///   - the \a ServerContext associated with this call is used for sending
-  ///     trailing (and initial if not already sent) metadata to the client.
-  ///
-  /// Note: there are no restrictions are the code of \a status,
-  /// it may be non-OK
-  void Finish(const Status& status, void* tag) override {
-    finish_ops_.set_output_tag(tag);
-    EnsureInitialMetadataSent(&finish_ops_);
-
-    finish_ops_.ServerSendStatus(ctx_->trailing_metadata_, status);
-    call_.PerformOps(&finish_ops_);
-  }
-
- private:
-  friend class ::grpc::Server;
-
-  void BindCall(::grpc::internal::Call* call) override { call_ = *call; }
-
-  template <class T>
-  void EnsureInitialMetadataSent(T* ops) {
-    if (!ctx_->sent_initial_metadata_) {
-      ops->SendInitialMetadata(ctx_->initial_metadata_,
-                               ctx_->initial_metadata_flags());
-      if (ctx_->compression_level_set()) {
-        ops->set_compression_level(ctx_->compression_level());
-      }
-      ctx_->sent_initial_metadata_ = true;
-    }
-  }
-
-  ::grpc::internal::Call call_;
-  ServerContext* ctx_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata>
-      meta_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvMessage<R>> read_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpSendMessage,
-                              ::grpc::internal::CallOpServerSendStatus>
-      write_ops_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpServerSendStatus>
-      finish_ops_;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/async_stream.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_ASYNC_STREAM_H
diff --git a/include/grpc++/impl/codegen/async_unary_call.h b/include/grpc++/impl/codegen/async_unary_call.h
index fb573004cb..2b08920a30 100644
--- a/include/grpc++/impl/codegen/async_unary_call.h
+++ b/include/grpc++/impl/codegen/async_unary_call.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,294 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_ASYNC_UNARY_CALL_H
 #define GRPCXX_IMPL_CODEGEN_ASYNC_UNARY_CALL_H
 
-#include <assert.h>
-#include <grpc++/impl/codegen/call.h>
-#include <grpc++/impl/codegen/channel_interface.h>
-#include <grpc++/impl/codegen/client_context.h>
-#include <grpc++/impl/codegen/server_context.h>
-#include <grpc++/impl/codegen/service_type.h>
-#include <grpc++/impl/codegen/status.h>
-
-namespace grpc {
-
-class CompletionQueue;
-extern CoreCodegenInterface* g_core_codegen_interface;
-
-/// An interface relevant for async client side unary RPCs (which send
-/// one request message to a server and receive one response message).
-template <class R>
-class ClientAsyncResponseReaderInterface {
- public:
-  virtual ~ClientAsyncResponseReaderInterface() {}
-
-  /// Start the call that was set up by the constructor, but only if the
-  /// constructor was invoked through the "Prepare" API which doesn't actually
-  /// start the call
-  virtual void StartCall() = 0;
-
-  /// Request notification of the reading of initial metadata. Completion
-  /// will be notified by \a tag on the associated completion queue.
-  /// This call is optional, but if it is used, it cannot be used concurrently
-  /// with or after the \a Finish method.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  virtual void ReadInitialMetadata(void* tag) = 0;
-
-  /// Request to receive the server's response \a msg and final \a status for
-  /// the call, and to notify \a tag on this call's completion queue when
-  /// finished.
-  ///
-  /// This function will return when either:
-  /// - when the server's response message and status have been received.
-  /// - when the server has returned a non-OK status (no message expected in
-  ///   this case).
-  /// - when the call failed for some reason and the library generated a
-  ///   non-OK status.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  /// \param[out] status To be updated with the operation status.
-  /// \param[out] msg To be filled in with the server's response message.
-  virtual void Finish(R* msg, Status* status, void* tag) = 0;
-};
-
-namespace internal {
-template <class R>
-class ClientAsyncResponseReaderFactory {
- public:
-  /// Start a call and write the request out if \a start is set.
-  /// \a tag will be notified on \a cq when the call has been started (i.e.
-  /// intitial metadata sent) and \a request has been written out.
-  /// If \a start is not set, the actual call must be initiated by StartCall
-  /// Note that \a context will be used to fill in custom initial metadata
-  /// used to send to the server when starting the call.
-  template <class W>
-  static ClientAsyncResponseReader<R>* Create(
-      ChannelInterface* channel, CompletionQueue* cq,
-      const ::grpc::internal::RpcMethod& method, ClientContext* context,
-      const W& request, bool start) {
-    ::grpc::internal::Call call = channel->CreateCall(method, context, cq);
-    return new (g_core_codegen_interface->grpc_call_arena_alloc(
-        call.call(), sizeof(ClientAsyncResponseReader<R>)))
-        ClientAsyncResponseReader<R>(call, context, request, start);
-  }
-};
-}  // namespace internal
-
-/// Async API for client-side unary RPCs, where the message response
-/// received from the server is of type \a R.
-template <class R>
-class ClientAsyncResponseReader final
-    : public ClientAsyncResponseReaderInterface<R> {
- public:
-  // always allocated against a call arena, no memory free required
-  static void operator delete(void* ptr, std::size_t size) {
-    assert(size == sizeof(ClientAsyncResponseReader));
-  }
-
-  // This operator should never be called as the memory should be freed as part
-  // of the arena destruction. It only exists to provide a matching operator
-  // delete to the operator new so that some compilers will not complain (see
-  // https://github.com/grpc/grpc/issues/11301) Note at the time of adding this
-  // there are no tests catching the compiler warning.
-  static void operator delete(void*, void*) { assert(0); }
-
-  void StartCall() override {
-    assert(!started_);
-    started_ = true;
-    StartCallInternal();
-  }
-
-  /// See \a ClientAsyncResponseReaderInterface::ReadInitialMetadata for
-  /// semantics.
-  ///
-  /// Side effect:
-  ///   - the \a ClientContext associated with this call is updated with
-  ///     possible initial and trailing metadata sent from the server.
-  void ReadInitialMetadata(void* tag) override {
-    assert(started_);
-    GPR_CODEGEN_ASSERT(!context_->initial_metadata_received_);
-
-    meta_buf.set_output_tag(tag);
-    meta_buf.RecvInitialMetadata(context_);
-    call_.PerformOps(&meta_buf);
-  }
-
-  /// See \a ClientAysncResponseReaderInterface::Finish for semantics.
-  ///
-  /// Side effect:
-  ///   - the \a ClientContext associated with this call is updated with
-  ///     possible initial and trailing metadata sent from the server.
-  void Finish(R* msg, Status* status, void* tag) override {
-    assert(started_);
-    finish_buf.set_output_tag(tag);
-    if (!context_->initial_metadata_received_) {
-      finish_buf.RecvInitialMetadata(context_);
-    }
-    finish_buf.RecvMessage(msg);
-    finish_buf.AllowNoMessage();
-    finish_buf.ClientRecvStatus(context_, status);
-    call_.PerformOps(&finish_buf);
-  }
-
- private:
-  friend class internal::ClientAsyncResponseReaderFactory<R>;
-  ClientContext* const context_;
-  ::grpc::internal::Call call_;
-  bool started_;
-
-  template <class W>
-  ClientAsyncResponseReader(::grpc::internal::Call call, ClientContext* context,
-                            const W& request, bool start)
-      : context_(context), call_(call), started_(start) {
-    // Bind the metadata at time of StartCallInternal but set up the rest here
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(init_buf.SendMessage(request).ok());
-    init_buf.ClientSendClose();
-    if (start) StartCallInternal();
-  }
-
-  void StartCallInternal() {
-    init_buf.SendInitialMetadata(context_->send_initial_metadata_,
-                                 context_->initial_metadata_flags());
-    call_.PerformOps(&init_buf);
-  }
-
-  // disable operator new
-  static void* operator new(std::size_t size);
-  static void* operator new(std::size_t size, void* p) { return p; }
-
-  ::grpc::internal::SneakyCallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                                    ::grpc::internal::CallOpSendMessage,
-                                    ::grpc::internal::CallOpClientSendClose>
-      init_buf;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata>
-      meta_buf;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                              ::grpc::internal::CallOpRecvMessage<R>,
-                              ::grpc::internal::CallOpClientRecvStatus>
-      finish_buf;
-};
-
-/// Async server-side API for handling unary calls, where the single
-/// response message sent to the client is of type \a W.
-template <class W>
-class ServerAsyncResponseWriter final
-    : public internal::ServerAsyncStreamingInterface {
- public:
-  explicit ServerAsyncResponseWriter(ServerContext* ctx)
-      : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
-
-  /// See \a ServerAsyncStreamingInterface::SendInitialMetadata for semantics.
-  ///
-  /// Side effect:
-  ///   The initial metadata that will be sent to the client from this op will
-  ///   be taken from the \a ServerContext associated with the call.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  void SendInitialMetadata(void* tag) override {
-    GPR_CODEGEN_ASSERT(!ctx_->sent_initial_metadata_);
-
-    meta_buf_.set_output_tag(tag);
-    meta_buf_.SendInitialMetadata(ctx_->initial_metadata_,
-                                  ctx_->initial_metadata_flags());
-    if (ctx_->compression_level_set()) {
-      meta_buf_.set_compression_level(ctx_->compression_level());
-    }
-    ctx_->sent_initial_metadata_ = true;
-    call_.PerformOps(&meta_buf_);
-  }
-
-  /// Indicate that the stream is to be finished and request notification
-  /// when the server has sent the appropriate signals to the client to
-  /// end the call. Should not be used concurrently with other operations.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  /// \param[in] status To be sent to the client as the result of the call.
-  /// \param[in] msg Message to be sent to the client.
-  ///
-  /// Side effect:
-  ///   - also sends initial metadata if not already sent (using the
-  ///     \a ServerContext associated with this call).
-  ///
-  /// Note: if \a status has a non-OK code, then \a msg will not be sent,
-  /// and the client will receive only the status with possible trailing
-  /// metadata.
-  void Finish(const W& msg, const Status& status, void* tag) {
-    finish_buf_.set_output_tag(tag);
-    if (!ctx_->sent_initial_metadata_) {
-      finish_buf_.SendInitialMetadata(ctx_->initial_metadata_,
-                                      ctx_->initial_metadata_flags());
-      if (ctx_->compression_level_set()) {
-        finish_buf_.set_compression_level(ctx_->compression_level());
-      }
-      ctx_->sent_initial_metadata_ = true;
-    }
-    // The response is dropped if the status is not OK.
-    if (status.ok()) {
-      finish_buf_.ServerSendStatus(ctx_->trailing_metadata_,
-                                   finish_buf_.SendMessage(msg));
-    } else {
-      finish_buf_.ServerSendStatus(ctx_->trailing_metadata_, status);
-    }
-    call_.PerformOps(&finish_buf_);
-  }
-
-  /// Indicate that the stream is to be finished with a non-OK status,
-  /// and request notification for when the server has finished sending the
-  /// appropriate signals to the client to end the call.
-  /// Should not be used concurrently with other operations.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  /// \param[in] status To be sent to the client as the result of the call.
-  ///   - Note: \a status must have a non-OK code.
-  ///
-  /// Side effect:
-  ///   - also sends initial metadata if not already sent (using the
-  ///     \a ServerContext associated with this call).
-  void FinishWithError(const Status& status, void* tag) {
-    GPR_CODEGEN_ASSERT(!status.ok());
-    finish_buf_.set_output_tag(tag);
-    if (!ctx_->sent_initial_metadata_) {
-      finish_buf_.SendInitialMetadata(ctx_->initial_metadata_,
-                                      ctx_->initial_metadata_flags());
-      if (ctx_->compression_level_set()) {
-        finish_buf_.set_compression_level(ctx_->compression_level());
-      }
-      ctx_->sent_initial_metadata_ = true;
-    }
-    finish_buf_.ServerSendStatus(ctx_->trailing_metadata_, status);
-    call_.PerformOps(&finish_buf_);
-  }
-
- private:
-  void BindCall(::grpc::internal::Call* call) override { call_ = *call; }
-
-  ::grpc::internal::Call call_;
-  ServerContext* ctx_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata>
-      meta_buf_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                              ::grpc::internal::CallOpSendMessage,
-                              ::grpc::internal::CallOpServerSendStatus>
-      finish_buf_;
-};
-
-}  // namespace grpc
-
-namespace std {
-template <class R>
-class default_delete<grpc::ClientAsyncResponseReader<R>> {
- public:
-  void operator()(void* p) {}
-};
-template <class R>
-class default_delete<grpc::ClientAsyncResponseReaderInterface<R>> {
- public:
-  void operator()(void* p) {}
-};
-}  // namespace std
+#include <grpcpp/impl/codegen/async_unary_call.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_ASYNC_UNARY_CALL_H
diff --git a/include/grpc++/impl/codegen/byte_buffer.h b/include/grpc++/impl/codegen/byte_buffer.h
index fe73ce7a83..b754fa24e9 100644
--- a/include/grpc++/impl/codegen/byte_buffer.h
+++ b/include/grpc++/impl/codegen/byte_buffer.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2017 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,142 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_BYTE_BUFFER_H
 #define GRPCXX_IMPL_CODEGEN_BYTE_BUFFER_H
 
-#include <grpc/impl/codegen/byte_buffer.h>
-
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/serialization_traits.h>
-#include <grpc++/impl/codegen/slice.h>
-#include <grpc++/impl/codegen/status.h>
-
-#include <vector>
-
-namespace grpc {
-
-namespace internal {
-class CallOpSendMessage;
-template <class R>
-class CallOpRecvMessage;
-class CallOpGenericRecvMessage;
-class MethodHandler;
-template <class ServiceType, class RequestType, class ResponseType>
-class RpcMethodHandler;
-template <class ServiceType, class RequestType, class ResponseType>
-class ServerStreamingHandler;
-template <class R>
-class DeserializeFuncType;
-}  // namespace internal
-/// A sequence of bytes.
-class ByteBuffer final {
- public:
-  /// Constuct an empty buffer.
-  ByteBuffer() : buffer_(nullptr) {}
-
-  /// Construct buffer from \a slices, of which there are \a nslices.
-  ByteBuffer(const Slice* slices, size_t nslices);
-
-  /// Constuct a byte buffer by referencing elements of existing buffer
-  /// \a buf. Wrapper of core function grpc_byte_buffer_copy
-  ByteBuffer(const ByteBuffer& buf);
-
-  ~ByteBuffer() {
-    if (buffer_) {
-      g_core_codegen_interface->grpc_byte_buffer_destroy(buffer_);
-    }
-  }
-
-  ByteBuffer& operator=(const ByteBuffer&);
-
-  /// Dump (read) the buffer contents into \a slices.
-  Status Dump(std::vector<Slice>* slices) const;
-
-  /// Remove all data.
-  void Clear() {
-    if (buffer_) {
-      g_core_codegen_interface->grpc_byte_buffer_destroy(buffer_);
-      buffer_ = nullptr;
-    }
-  }
-
-  /// Make a duplicate copy of the internals of this byte
-  /// buffer so that we have our own owned version of it.
-  /// bbuf.Duplicate(); is equivalent to bbuf=bbuf; but is actually readable
-  void Duplicate() {
-    buffer_ = g_core_codegen_interface->grpc_byte_buffer_copy(buffer_);
-  }
-
-  /// Forget underlying byte buffer without destroying
-  /// Use this only for un-owned byte buffers
-  void Release() { buffer_ = nullptr; }
-
-  /// Buffer size in bytes.
-  size_t Length() const;
-
-  /// Swap the state of *this and *other.
-  void Swap(ByteBuffer* other);
-
-  /// Is this ByteBuffer valid?
-  bool Valid() const { return (buffer_ != nullptr); }
-
- private:
-  friend class SerializationTraits<ByteBuffer, void>;
-  friend class internal::CallOpSendMessage;
-  template <class R>
-  friend class internal::CallOpRecvMessage;
-  friend class internal::CallOpGenericRecvMessage;
-  friend class internal::MethodHandler;
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class internal::RpcMethodHandler;
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class internal::ServerStreamingHandler;
-  template <class R>
-  friend class internal::DeserializeFuncType;
-
-  grpc_byte_buffer* buffer_;
-
-  // takes ownership
-  void set_buffer(grpc_byte_buffer* buf) {
-    if (buffer_) {
-      Clear();
-    }
-    buffer_ = buf;
-  }
-
-  grpc_byte_buffer* c_buffer() { return buffer_; }
-  grpc_byte_buffer** c_buffer_ptr() { return &buffer_; }
-
-  class ByteBufferPointer {
-   public:
-    ByteBufferPointer(const ByteBuffer* b)
-        : bbuf_(const_cast<ByteBuffer*>(b)) {}
-    operator ByteBuffer*() { return bbuf_; }
-    operator grpc_byte_buffer*() { return bbuf_->buffer_; }
-    operator grpc_byte_buffer**() { return &bbuf_->buffer_; }
-
-   private:
-    ByteBuffer* bbuf_;
-  };
-  ByteBufferPointer bbuf_ptr() const { return ByteBufferPointer(this); }
-};
-
-template <>
-class SerializationTraits<ByteBuffer, void> {
- public:
-  static Status Deserialize(ByteBuffer* byte_buffer, ByteBuffer* dest) {
-    dest->set_buffer(byte_buffer->buffer_);
-    return Status::OK;
-  }
-  static Status Serialize(const ByteBuffer& source, ByteBuffer* buffer,
-                          bool* own_buffer) {
-    *buffer = source;
-    *own_buffer = true;
-    return Status::OK;
-  }
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/byte_buffer.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_BYTE_BUFFER_H
diff --git a/include/grpc++/impl/codegen/call.h b/include/grpc++/impl/codegen/call.h
index c04526c59b..dadab5454a 100644
--- a/include/grpc++/impl/codegen/call.h
+++ b/include/grpc++/impl/codegen/call.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,694 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CALL_H
 #define GRPCXX_IMPL_CODEGEN_CALL_H
 
-#include <assert.h>
-#include <cstring>
-#include <functional>
-#include <map>
-#include <memory>
-
-#include <grpc++/impl/codegen/byte_buffer.h>
-#include <grpc++/impl/codegen/call_hook.h>
-#include <grpc++/impl/codegen/client_context.h>
-#include <grpc++/impl/codegen/completion_queue_tag.h>
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/serialization_traits.h>
-#include <grpc++/impl/codegen/slice.h>
-#include <grpc++/impl/codegen/status.h>
-#include <grpc++/impl/codegen/string_ref.h>
-
-#include <grpc/impl/codegen/atm.h>
-#include <grpc/impl/codegen/compression_types.h>
-#include <grpc/impl/codegen/grpc_types.h>
-
-namespace grpc {
-
-class ByteBuffer;
-class CompletionQueue;
-extern CoreCodegenInterface* g_core_codegen_interface;
-
-namespace internal {
-class Call;
-class CallHook;
-
-const char kBinaryErrorDetailsKey[] = "grpc-status-details-bin";
-
-// TODO(yangg) if the map is changed before we send, the pointers will be a
-// mess. Make sure it does not happen.
-inline grpc_metadata* FillMetadataArray(
-    const std::multimap<grpc::string, grpc::string>& metadata,
-    size_t* metadata_count, const grpc::string& optional_error_details) {
-  *metadata_count = metadata.size() + (optional_error_details.empty() ? 0 : 1);
-  if (*metadata_count == 0) {
-    return nullptr;
-  }
-  grpc_metadata* metadata_array =
-      (grpc_metadata*)(g_core_codegen_interface->gpr_malloc(
-          (*metadata_count) * sizeof(grpc_metadata)));
-  size_t i = 0;
-  for (auto iter = metadata.cbegin(); iter != metadata.cend(); ++iter, ++i) {
-    metadata_array[i].key = SliceReferencingString(iter->first);
-    metadata_array[i].value = SliceReferencingString(iter->second);
-  }
-  if (!optional_error_details.empty()) {
-    metadata_array[i].key =
-        g_core_codegen_interface->grpc_slice_from_static_buffer(
-            kBinaryErrorDetailsKey, sizeof(kBinaryErrorDetailsKey) - 1);
-    metadata_array[i].value = SliceReferencingString(optional_error_details);
-  }
-  return metadata_array;
-}
-}  // namespace internal
-
-/// Per-message write options.
-class WriteOptions {
- public:
-  WriteOptions() : flags_(0), last_message_(false) {}
-  WriteOptions(const WriteOptions& other)
-      : flags_(other.flags_), last_message_(other.last_message_) {}
-
-  /// Clear all flags.
-  inline void Clear() { flags_ = 0; }
-
-  /// Returns raw flags bitset.
-  inline uint32_t flags() const { return flags_; }
-
-  /// Sets flag for the disabling of compression for the next message write.
-  ///
-  /// \sa GRPC_WRITE_NO_COMPRESS
-  inline WriteOptions& set_no_compression() {
-    SetBit(GRPC_WRITE_NO_COMPRESS);
-    return *this;
-  }
-
-  /// Clears flag for the disabling of compression for the next message write.
-  ///
-  /// \sa GRPC_WRITE_NO_COMPRESS
-  inline WriteOptions& clear_no_compression() {
-    ClearBit(GRPC_WRITE_NO_COMPRESS);
-    return *this;
-  }
-
-  /// Get value for the flag indicating whether compression for the next
-  /// message write is forcefully disabled.
-  ///
-  /// \sa GRPC_WRITE_NO_COMPRESS
-  inline bool get_no_compression() const {
-    return GetBit(GRPC_WRITE_NO_COMPRESS);
-  }
-
-  /// Sets flag indicating that the write may be buffered and need not go out on
-  /// the wire immediately.
-  ///
-  /// \sa GRPC_WRITE_BUFFER_HINT
-  inline WriteOptions& set_buffer_hint() {
-    SetBit(GRPC_WRITE_BUFFER_HINT);
-    return *this;
-  }
-
-  /// Clears flag indicating that the write may be buffered and need not go out
-  /// on the wire immediately.
-  ///
-  /// \sa GRPC_WRITE_BUFFER_HINT
-  inline WriteOptions& clear_buffer_hint() {
-    ClearBit(GRPC_WRITE_BUFFER_HINT);
-    return *this;
-  }
-
-  /// Get value for the flag indicating that the write may be buffered and need
-  /// not go out on the wire immediately.
-  ///
-  /// \sa GRPC_WRITE_BUFFER_HINT
-  inline bool get_buffer_hint() const { return GetBit(GRPC_WRITE_BUFFER_HINT); }
-
-  /// corked bit: aliases set_buffer_hint currently, with the intent that
-  /// set_buffer_hint will be removed in the future
-  inline WriteOptions& set_corked() {
-    SetBit(GRPC_WRITE_BUFFER_HINT);
-    return *this;
-  }
-
-  inline WriteOptions& clear_corked() {
-    ClearBit(GRPC_WRITE_BUFFER_HINT);
-    return *this;
-  }
-
-  inline bool is_corked() const { return GetBit(GRPC_WRITE_BUFFER_HINT); }
-
-  /// last-message bit: indicates this is the last message in a stream
-  /// client-side:  makes Write the equivalent of performing Write, WritesDone
-  /// in a single step
-  /// server-side:  hold the Write until the service handler returns (sync api)
-  /// or until Finish is called (async api)
-  inline WriteOptions& set_last_message() {
-    last_message_ = true;
-    return *this;
-  }
-
-  /// Clears flag indicating that this is the last message in a stream,
-  /// disabling coalescing.
-  inline WriteOptions& clear_last_message() {
-    last_message_ = false;
-    return *this;
-  }
-
-  /// Guarantee that all bytes have been written to the wire before completing
-  /// this write (usually writes are completed when they pass flow control)
-  inline WriteOptions& set_write_through() {
-    SetBit(GRPC_WRITE_THROUGH);
-    return *this;
-  }
-
-  inline bool is_write_through() const { return GetBit(GRPC_WRITE_THROUGH); }
-
-  /// Get value for the flag indicating that this is the last message, and
-  /// should be coalesced with trailing metadata.
-  ///
-  /// \sa GRPC_WRITE_LAST_MESSAGE
-  bool is_last_message() const { return last_message_; }
-
-  WriteOptions& operator=(const WriteOptions& rhs) {
-    flags_ = rhs.flags_;
-    return *this;
-  }
-
- private:
-  void SetBit(const uint32_t mask) { flags_ |= mask; }
-
-  void ClearBit(const uint32_t mask) { flags_ &= ~mask; }
-
-  bool GetBit(const uint32_t mask) const { return (flags_ & mask) != 0; }
-
-  uint32_t flags_;
-  bool last_message_;
-};
-
-namespace internal {
-/// Default argument for CallOpSet. I is unused by the class, but can be
-/// used for generating multiple names for the same thing.
-template <int I>
-class CallNoOp {
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {}
-  void FinishOp(bool* status) {}
-};
-
-class CallOpSendInitialMetadata {
- public:
-  CallOpSendInitialMetadata() : send_(false) {
-    maybe_compression_level_.is_set = false;
-  }
-
-  void SendInitialMetadata(
-      const std::multimap<grpc::string, grpc::string>& metadata,
-      uint32_t flags) {
-    maybe_compression_level_.is_set = false;
-    send_ = true;
-    flags_ = flags;
-    initial_metadata_ =
-        FillMetadataArray(metadata, &initial_metadata_count_, "");
-  }
-
-  void set_compression_level(grpc_compression_level level) {
-    maybe_compression_level_.is_set = true;
-    maybe_compression_level_.level = level;
-  }
-
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {
-    if (!send_) return;
-    grpc_op* op = &ops[(*nops)++];
-    op->op = GRPC_OP_SEND_INITIAL_METADATA;
-    op->flags = flags_;
-    op->reserved = NULL;
-    op->data.send_initial_metadata.count = initial_metadata_count_;
-    op->data.send_initial_metadata.metadata = initial_metadata_;
-    op->data.send_initial_metadata.maybe_compression_level.is_set =
-        maybe_compression_level_.is_set;
-    if (maybe_compression_level_.is_set) {
-      op->data.send_initial_metadata.maybe_compression_level.level =
-          maybe_compression_level_.level;
-    }
-  }
-  void FinishOp(bool* status) {
-    if (!send_) return;
-    g_core_codegen_interface->gpr_free(initial_metadata_);
-    send_ = false;
-  }
-
-  bool send_;
-  uint32_t flags_;
-  size_t initial_metadata_count_;
-  grpc_metadata* initial_metadata_;
-  struct {
-    bool is_set;
-    grpc_compression_level level;
-  } maybe_compression_level_;
-};
-
-class CallOpSendMessage {
- public:
-  CallOpSendMessage() : send_buf_() {}
-
-  /// Send \a message using \a options for the write. The \a options are cleared
-  /// after use.
-  template <class M>
-  Status SendMessage(const M& message,
-                     WriteOptions options) GRPC_MUST_USE_RESULT;
-
-  template <class M>
-  Status SendMessage(const M& message) GRPC_MUST_USE_RESULT;
-
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {
-    if (!send_buf_.Valid()) return;
-    grpc_op* op = &ops[(*nops)++];
-    op->op = GRPC_OP_SEND_MESSAGE;
-    op->flags = write_options_.flags();
-    op->reserved = NULL;
-    op->data.send_message.send_message = send_buf_.c_buffer();
-    // Flags are per-message: clear them after use.
-    write_options_.Clear();
-  }
-  void FinishOp(bool* status) { send_buf_.Clear(); }
-
- private:
-  ByteBuffer send_buf_;
-  WriteOptions write_options_;
-};
-
-template <class M>
-Status CallOpSendMessage::SendMessage(const M& message, WriteOptions options) {
-  write_options_ = options;
-  bool own_buf;
-  // TODO(vjpai): Remove the void below when possible
-  // The void in the template parameter below should not be needed
-  // (since it should be implicit) but is needed due to an observed
-  // difference in behavior between clang and gcc for certain internal users
-  Status result = SerializationTraits<M, void>::Serialize(
-      message, send_buf_.bbuf_ptr(), &own_buf);
-  if (!own_buf) {
-    send_buf_.Duplicate();
-  }
-  return result;
-}
-
-template <class M>
-Status CallOpSendMessage::SendMessage(const M& message) {
-  return SendMessage(message, WriteOptions());
-}
-
-template <class R>
-class CallOpRecvMessage {
- public:
-  CallOpRecvMessage()
-      : got_message(false),
-        message_(nullptr),
-        allow_not_getting_message_(false) {}
-
-  void RecvMessage(R* message) { message_ = message; }
-
-  // Do not change status if no message is received.
-  void AllowNoMessage() { allow_not_getting_message_ = true; }
-
-  bool got_message;
-
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {
-    if (message_ == nullptr) return;
-    grpc_op* op = &ops[(*nops)++];
-    op->op = GRPC_OP_RECV_MESSAGE;
-    op->flags = 0;
-    op->reserved = NULL;
-    op->data.recv_message.recv_message = recv_buf_.c_buffer_ptr();
-  }
-
-  void FinishOp(bool* status) {
-    if (message_ == nullptr) return;
-    if (recv_buf_.Valid()) {
-      if (*status) {
-        got_message = *status =
-            SerializationTraits<R>::Deserialize(recv_buf_.bbuf_ptr(), message_)
-                .ok();
-        recv_buf_.Release();
-      } else {
-        got_message = false;
-        recv_buf_.Clear();
-      }
-    } else {
-      got_message = false;
-      if (!allow_not_getting_message_) {
-        *status = false;
-      }
-    }
-    message_ = nullptr;
-  }
-
- private:
-  R* message_;
-  ByteBuffer recv_buf_;
-  bool allow_not_getting_message_;
-};
-
-class DeserializeFunc {
- public:
-  virtual Status Deserialize(ByteBuffer* buf) = 0;
-  virtual ~DeserializeFunc() {}
-};
-
-template <class R>
-class DeserializeFuncType final : public DeserializeFunc {
- public:
-  DeserializeFuncType(R* message) : message_(message) {}
-  Status Deserialize(ByteBuffer* buf) override {
-    return SerializationTraits<R>::Deserialize(buf->bbuf_ptr(), message_);
-  }
-
-  ~DeserializeFuncType() override {}
-
- private:
-  R* message_;  // Not a managed pointer because management is external to this
-};
-
-class CallOpGenericRecvMessage {
- public:
-  CallOpGenericRecvMessage()
-      : got_message(false), allow_not_getting_message_(false) {}
-
-  template <class R>
-  void RecvMessage(R* message) {
-    // Use an explicit base class pointer to avoid resolution error in the
-    // following unique_ptr::reset for some old implementations.
-    DeserializeFunc* func = new DeserializeFuncType<R>(message);
-    deserialize_.reset(func);
-  }
-
-  // Do not change status if no message is received.
-  void AllowNoMessage() { allow_not_getting_message_ = true; }
-
-  bool got_message;
-
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {
-    if (!deserialize_) return;
-    grpc_op* op = &ops[(*nops)++];
-    op->op = GRPC_OP_RECV_MESSAGE;
-    op->flags = 0;
-    op->reserved = NULL;
-    op->data.recv_message.recv_message = recv_buf_.c_buffer_ptr();
-  }
-
-  void FinishOp(bool* status) {
-    if (!deserialize_) return;
-    if (recv_buf_.Valid()) {
-      if (*status) {
-        got_message = true;
-        *status = deserialize_->Deserialize(&recv_buf_).ok();
-        recv_buf_.Release();
-      } else {
-        got_message = false;
-        recv_buf_.Clear();
-      }
-    } else {
-      got_message = false;
-      if (!allow_not_getting_message_) {
-        *status = false;
-      }
-    }
-    deserialize_.reset();
-  }
-
- private:
-  std::unique_ptr<DeserializeFunc> deserialize_;
-  ByteBuffer recv_buf_;
-  bool allow_not_getting_message_;
-};
-
-class CallOpClientSendClose {
- public:
-  CallOpClientSendClose() : send_(false) {}
-
-  void ClientSendClose() { send_ = true; }
-
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {
-    if (!send_) return;
-    grpc_op* op = &ops[(*nops)++];
-    op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
-    op->flags = 0;
-    op->reserved = NULL;
-  }
-  void FinishOp(bool* status) { send_ = false; }
-
- private:
-  bool send_;
-};
-
-class CallOpServerSendStatus {
- public:
-  CallOpServerSendStatus() : send_status_available_(false) {}
-
-  void ServerSendStatus(
-      const std::multimap<grpc::string, grpc::string>& trailing_metadata,
-      const Status& status) {
-    send_error_details_ = status.error_details();
-    trailing_metadata_ = FillMetadataArray(
-        trailing_metadata, &trailing_metadata_count_, send_error_details_);
-    send_status_available_ = true;
-    send_status_code_ = static_cast<grpc_status_code>(status.error_code());
-    send_error_message_ = status.error_message();
-  }
-
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {
-    if (!send_status_available_) return;
-    grpc_op* op = &ops[(*nops)++];
-    op->op = GRPC_OP_SEND_STATUS_FROM_SERVER;
-    op->data.send_status_from_server.trailing_metadata_count =
-        trailing_metadata_count_;
-    op->data.send_status_from_server.trailing_metadata = trailing_metadata_;
-    op->data.send_status_from_server.status = send_status_code_;
-    error_message_slice_ = SliceReferencingString(send_error_message_);
-    op->data.send_status_from_server.status_details =
-        send_error_message_.empty() ? nullptr : &error_message_slice_;
-    op->flags = 0;
-    op->reserved = NULL;
-  }
-
-  void FinishOp(bool* status) {
-    if (!send_status_available_) return;
-    g_core_codegen_interface->gpr_free(trailing_metadata_);
-    send_status_available_ = false;
-  }
-
- private:
-  bool send_status_available_;
-  grpc_status_code send_status_code_;
-  grpc::string send_error_details_;
-  grpc::string send_error_message_;
-  size_t trailing_metadata_count_;
-  grpc_metadata* trailing_metadata_;
-  grpc_slice error_message_slice_;
-};
-
-class CallOpRecvInitialMetadata {
- public:
-  CallOpRecvInitialMetadata() : metadata_map_(nullptr) {}
-
-  void RecvInitialMetadata(ClientContext* context) {
-    context->initial_metadata_received_ = true;
-    metadata_map_ = &context->recv_initial_metadata_;
-  }
-
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {
-    if (metadata_map_ == nullptr) return;
-    grpc_op* op = &ops[(*nops)++];
-    op->op = GRPC_OP_RECV_INITIAL_METADATA;
-    op->data.recv_initial_metadata.recv_initial_metadata = metadata_map_->arr();
-    op->flags = 0;
-    op->reserved = NULL;
-  }
-
-  void FinishOp(bool* status) {
-    if (metadata_map_ == nullptr) return;
-    metadata_map_->FillMap();
-    metadata_map_ = nullptr;
-  }
-
- private:
-  MetadataMap* metadata_map_;
-};
-
-class CallOpClientRecvStatus {
- public:
-  CallOpClientRecvStatus()
-      : recv_status_(nullptr), debug_error_string_(nullptr) {}
-
-  void ClientRecvStatus(ClientContext* context, Status* status) {
-    client_context_ = context;
-    metadata_map_ = &client_context_->trailing_metadata_;
-    recv_status_ = status;
-    error_message_ = g_core_codegen_interface->grpc_empty_slice();
-  }
-
- protected:
-  void AddOp(grpc_op* ops, size_t* nops) {
-    if (recv_status_ == nullptr) return;
-    grpc_op* op = &ops[(*nops)++];
-    op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
-    op->data.recv_status_on_client.trailing_metadata = metadata_map_->arr();
-    op->data.recv_status_on_client.status = &status_code_;
-    op->data.recv_status_on_client.status_details = &error_message_;
-    op->data.recv_status_on_client.error_string = &debug_error_string_;
-    op->flags = 0;
-    op->reserved = NULL;
-  }
-
-  void FinishOp(bool* status) {
-    if (recv_status_ == nullptr) return;
-    metadata_map_->FillMap();
-    grpc::string binary_error_details;
-    auto iter = metadata_map_->map()->find(kBinaryErrorDetailsKey);
-    if (iter != metadata_map_->map()->end()) {
-      binary_error_details =
-          grpc::string(iter->second.begin(), iter->second.length());
-    }
-    *recv_status_ = Status(static_cast<StatusCode>(status_code_),
-                           grpc::string(GRPC_SLICE_START_PTR(error_message_),
-                                        GRPC_SLICE_END_PTR(error_message_)),
-                           binary_error_details);
-    client_context_->set_debug_error_string(
-        debug_error_string_ != nullptr ? debug_error_string_ : "");
-    g_core_codegen_interface->grpc_slice_unref(error_message_);
-    if (debug_error_string_ != nullptr) {
-      g_core_codegen_interface->gpr_free((void*)debug_error_string_);
-    }
-    recv_status_ = nullptr;
-  }
-
- private:
-  ClientContext* client_context_;
-  MetadataMap* metadata_map_;
-  Status* recv_status_;
-  const char* debug_error_string_;
-  grpc_status_code status_code_;
-  grpc_slice error_message_;
-};
-
-/// An abstract collection of call ops, used to generate the
-/// grpc_call_op structure to pass down to the lower layers,
-/// and as it is-a CompletionQueueTag, also massages the final
-/// completion into the correct form for consumption in the C++
-/// API.
-class CallOpSetInterface : public CompletionQueueTag {
- public:
-  /// Fills in grpc_op, starting from ops[*nops] and moving
-  /// upwards.
-  virtual void FillOps(grpc_call* call, grpc_op* ops, size_t* nops) = 0;
-};
-
-/// Primary implementation of CallOpSetInterface.
-/// Since we cannot use variadic templates, we declare slots up to
-/// the maximum count of ops we'll need in a set. We leverage the
-/// empty base class optimization to slim this class (especially
-/// when there are many unused slots used). To avoid duplicate base classes,
-/// the template parmeter for CallNoOp is varied by argument position.
-template <class Op1 = CallNoOp<1>, class Op2 = CallNoOp<2>,
-          class Op3 = CallNoOp<3>, class Op4 = CallNoOp<4>,
-          class Op5 = CallNoOp<5>, class Op6 = CallNoOp<6>>
-class CallOpSet : public CallOpSetInterface,
-                  public Op1,
-                  public Op2,
-                  public Op3,
-                  public Op4,
-                  public Op5,
-                  public Op6 {
- public:
-  CallOpSet() : return_tag_(this), call_(nullptr) {}
-  void FillOps(grpc_call* call, grpc_op* ops, size_t* nops) override {
-    this->Op1::AddOp(ops, nops);
-    this->Op2::AddOp(ops, nops);
-    this->Op3::AddOp(ops, nops);
-    this->Op4::AddOp(ops, nops);
-    this->Op5::AddOp(ops, nops);
-    this->Op6::AddOp(ops, nops);
-    g_core_codegen_interface->grpc_call_ref(call);
-    call_ = call;
-  }
-
-  bool FinalizeResult(void** tag, bool* status) override {
-    this->Op1::FinishOp(status);
-    this->Op2::FinishOp(status);
-    this->Op3::FinishOp(status);
-    this->Op4::FinishOp(status);
-    this->Op5::FinishOp(status);
-    this->Op6::FinishOp(status);
-    *tag = return_tag_;
-
-    g_core_codegen_interface->grpc_call_unref(call_);
-    return true;
-  }
-
-  void set_output_tag(void* return_tag) { return_tag_ = return_tag; }
-
- private:
-  void* return_tag_;
-  grpc_call* call_;
-};
-
-/// A CallOpSet that does not post completions to the completion queue.
-///
-/// Allows hiding some completions that the C core must generate from
-/// C++ users.
-template <class Op1 = CallNoOp<1>, class Op2 = CallNoOp<2>,
-          class Op3 = CallNoOp<3>, class Op4 = CallNoOp<4>,
-          class Op5 = CallNoOp<5>, class Op6 = CallNoOp<6>>
-class SneakyCallOpSet : public CallOpSet<Op1, Op2, Op3, Op4, Op5, Op6> {
- public:
-  bool FinalizeResult(void** tag, bool* status) override {
-    typedef CallOpSet<Op1, Op2, Op3, Op4, Op5, Op6> Base;
-    return Base::FinalizeResult(tag, status) && false;
-  }
-};
-
-/// Straightforward wrapping of the C call object
-class Call final {
- public:
-  /** call is owned by the caller */
-  Call(grpc_call* call, CallHook* call_hook, CompletionQueue* cq)
-      : call_hook_(call_hook),
-        cq_(cq),
-        call_(call),
-        max_receive_message_size_(-1) {}
-
-  Call(grpc_call* call, CallHook* call_hook, CompletionQueue* cq,
-       int max_receive_message_size)
-      : call_hook_(call_hook),
-        cq_(cq),
-        call_(call),
-        max_receive_message_size_(max_receive_message_size) {}
-
-  void PerformOps(CallOpSetInterface* ops) {
-    call_hook_->PerformOpsOnCall(ops, this);
-  }
-
-  grpc_call* call() const { return call_; }
-  CompletionQueue* cq() const { return cq_; }
-
-  int max_receive_message_size() const { return max_receive_message_size_; }
-
- private:
-  CallHook* call_hook_;
-  CompletionQueue* cq_;
-  grpc_call* call_;
-  int max_receive_message_size_;
-};
-}  // namespace internal
-}  // namespace grpc
+#include <grpcpp/impl/codegen/call.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CALL_H
diff --git a/include/grpc++/impl/codegen/call_hook.h b/include/grpc++/impl/codegen/call_hook.h
index 44e9de220e..cf5ed571b2 100644
--- a/include/grpc++/impl/codegen/call_hook.h
+++ b/include/grpc++/impl/codegen/call_hook.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,24 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CALL_HOOK_H
 #define GRPCXX_IMPL_CODEGEN_CALL_HOOK_H
 
-namespace grpc {
-
-namespace internal {
-class CallOpSetInterface;
-class Call;
-
-/// This is an interface that Channel and Server implement to allow them to hook
-/// performing ops.
-class CallHook {
- public:
-  virtual ~CallHook() {}
-  virtual void PerformOpsOnCall(CallOpSetInterface* ops, Call* call) = 0;
-};
-}  // namespace internal
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/call_hook.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CALL_HOOK_H
diff --git a/include/grpc++/impl/codegen/channel_interface.h b/include/grpc++/impl/codegen/channel_interface.h
index 769f853974..c6e782e9c4 100644
--- a/include/grpc++/impl/codegen/channel_interface.h
+++ b/include/grpc++/impl/codegen/channel_interface.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,106 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CHANNEL_INTERFACE_H
 #define GRPCXX_IMPL_CODEGEN_CHANNEL_INTERFACE_H
 
-#include <grpc++/impl/codegen/status.h>
-#include <grpc++/impl/codegen/time.h>
-#include <grpc/impl/codegen/connectivity_state.h>
-
-namespace grpc {
-class ChannelInterface;
-class ClientContext;
-class CompletionQueue;
-
-template <class R>
-class ClientReader;
-template <class W>
-class ClientWriter;
-template <class W, class R>
-class ClientReaderWriter;
-
-namespace internal {
-class Call;
-class CallOpSetInterface;
-class RpcMethod;
-template <class InputMessage, class OutputMessage>
-class BlockingUnaryCallImpl;
-template <class R>
-class ClientAsyncReaderFactory;
-template <class W>
-class ClientAsyncWriterFactory;
-template <class W, class R>
-class ClientAsyncReaderWriterFactory;
-template <class R>
-class ClientAsyncResponseReaderFactory;
-}  // namespace internal
-
-/// Codegen interface for \a grpc::Channel.
-class ChannelInterface {
- public:
-  virtual ~ChannelInterface() {}
-  /// Get the current channel state. If the channel is in IDLE and
-  /// \a try_to_connect is set to true, try to connect.
-  virtual grpc_connectivity_state GetState(bool try_to_connect) = 0;
-
-  /// Return the \a tag on \a cq when the channel state is changed or \a
-  /// deadline expires. \a GetState needs to called to get the current state.
-  template <typename T>
-  void NotifyOnStateChange(grpc_connectivity_state last_observed, T deadline,
-                           CompletionQueue* cq, void* tag) {
-    TimePoint<T> deadline_tp(deadline);
-    NotifyOnStateChangeImpl(last_observed, deadline_tp.raw_time(), cq, tag);
-  }
-
-  /// Blocking wait for channel state change or \a deadline expiration.
-  /// \a GetState needs to called to get the current state.
-  template <typename T>
-  bool WaitForStateChange(grpc_connectivity_state last_observed, T deadline) {
-    TimePoint<T> deadline_tp(deadline);
-    return WaitForStateChangeImpl(last_observed, deadline_tp.raw_time());
-  }
-
-  /// Wait for this channel to be connected
-  template <typename T>
-  bool WaitForConnected(T deadline) {
-    grpc_connectivity_state state;
-    while ((state = GetState(true)) != GRPC_CHANNEL_READY) {
-      if (!WaitForStateChange(state, deadline)) return false;
-    }
-    return true;
-  }
-
- private:
-  template <class R>
-  friend class ::grpc::ClientReader;
-  template <class W>
-  friend class ::grpc::ClientWriter;
-  template <class W, class R>
-  friend class ::grpc::ClientReaderWriter;
-  template <class R>
-  friend class ::grpc::internal::ClientAsyncReaderFactory;
-  template <class W>
-  friend class ::grpc::internal::ClientAsyncWriterFactory;
-  template <class W, class R>
-  friend class ::grpc::internal::ClientAsyncReaderWriterFactory;
-  template <class R>
-  friend class ::grpc::internal::ClientAsyncResponseReaderFactory;
-  template <class InputMessage, class OutputMessage>
-  friend class ::grpc::internal::BlockingUnaryCallImpl;
-  friend class ::grpc::internal::RpcMethod;
-  virtual internal::Call CreateCall(const internal::RpcMethod& method,
-                                    ClientContext* context,
-                                    CompletionQueue* cq) = 0;
-  virtual void PerformOpsOnCall(internal::CallOpSetInterface* ops,
-                                internal::Call* call) = 0;
-  virtual void* RegisterMethod(const char* method) = 0;
-  virtual void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
-                                       gpr_timespec deadline,
-                                       CompletionQueue* cq, void* tag) = 0;
-  virtual bool WaitForStateChangeImpl(grpc_connectivity_state last_observed,
-                                      gpr_timespec deadline) = 0;
-};
-}  // namespace grpc
+#include <grpcpp/impl/codegen/channel_interface.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CHANNEL_INTERFACE_H
diff --git a/include/grpc++/impl/codegen/client_context.h b/include/grpc++/impl/codegen/client_context.h
index 38cce27b99..107532cb6b 100644
--- a/include/grpc++/impl/codegen/client_context.h
+++ b/include/grpc++/impl/codegen/client_context.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,427 +16,13 @@
  *
  */
 
-/// A ClientContext allows the person implementing a service client to:
-///
-/// - Add custom metadata key-value pairs that will propagated to the server
-/// side.
-/// - Control call settings such as compression and authentication.
-/// - Initial and trailing metadata coming from the server.
-/// - Get performance metrics (ie, census).
-///
-/// Context settings are only relevant to the call they are invoked with, that
-/// is to say, they aren't sticky. Some of these settings, such as the
-/// compression options, can be made persistent at channel construction time
-/// (see \a grpc::CreateCustomChannel).
-///
-/// \warning ClientContext instances should \em not be reused across rpcs.
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
 
 #ifndef GRPCXX_IMPL_CODEGEN_CLIENT_CONTEXT_H
 #define GRPCXX_IMPL_CODEGEN_CLIENT_CONTEXT_H
 
-#include <map>
-#include <memory>
-#include <mutex>
-#include <string>
-
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/create_auth_context.h>
-#include <grpc++/impl/codegen/metadata_map.h>
-#include <grpc++/impl/codegen/security/auth_context.h>
-#include <grpc++/impl/codegen/slice.h>
-#include <grpc++/impl/codegen/status.h>
-#include <grpc++/impl/codegen/string_ref.h>
-#include <grpc++/impl/codegen/time.h>
-#include <grpc/impl/codegen/compression_types.h>
-#include <grpc/impl/codegen/propagation_bits.h>
-
-struct census_context;
-struct grpc_call;
-
-namespace grpc {
-
-class Channel;
-class ChannelInterface;
-class CompletionQueue;
-class CallCredentials;
-class ClientContext;
-
-namespace internal {
-class RpcMethod;
-class CallOpClientRecvStatus;
-class CallOpRecvInitialMetadata;
-template <class InputMessage, class OutputMessage>
-class BlockingUnaryCallImpl;
-}  // namespace internal
-
-template <class R>
-class ClientReader;
-template <class W>
-class ClientWriter;
-template <class W, class R>
-class ClientReaderWriter;
-template <class R>
-class ClientAsyncReader;
-template <class W>
-class ClientAsyncWriter;
-template <class W, class R>
-class ClientAsyncReaderWriter;
-template <class R>
-class ClientAsyncResponseReader;
-class ServerContext;
-
-/// Options for \a ClientContext::FromServerContext specifying which traits from
-/// the \a ServerContext to propagate (copy) from it into a new \a
-/// ClientContext.
-///
-/// \see ClientContext::FromServerContext
-class PropagationOptions {
- public:
-  PropagationOptions() : propagate_(GRPC_PROPAGATE_DEFAULTS) {}
-
-  PropagationOptions& enable_deadline_propagation() {
-    propagate_ |= GRPC_PROPAGATE_DEADLINE;
-    return *this;
-  }
-
-  PropagationOptions& disable_deadline_propagation() {
-    propagate_ &= ~GRPC_PROPAGATE_DEADLINE;
-    return *this;
-  }
-
-  PropagationOptions& enable_census_stats_propagation() {
-    propagate_ |= GRPC_PROPAGATE_CENSUS_STATS_CONTEXT;
-    return *this;
-  }
-
-  PropagationOptions& disable_census_stats_propagation() {
-    propagate_ &= ~GRPC_PROPAGATE_CENSUS_STATS_CONTEXT;
-    return *this;
-  }
-
-  PropagationOptions& enable_census_tracing_propagation() {
-    propagate_ |= GRPC_PROPAGATE_CENSUS_TRACING_CONTEXT;
-    return *this;
-  }
-
-  PropagationOptions& disable_census_tracing_propagation() {
-    propagate_ &= ~GRPC_PROPAGATE_CENSUS_TRACING_CONTEXT;
-    return *this;
-  }
-
-  PropagationOptions& enable_cancellation_propagation() {
-    propagate_ |= GRPC_PROPAGATE_CANCELLATION;
-    return *this;
-  }
-
-  PropagationOptions& disable_cancellation_propagation() {
-    propagate_ &= ~GRPC_PROPAGATE_CANCELLATION;
-    return *this;
-  }
-
-  uint32_t c_bitmask() const { return propagate_; }
-
- private:
-  uint32_t propagate_;
-};
-
-namespace testing {
-class InteropClientContextInspector;
-}  // namespace testing
-
-/// A ClientContext allows the person implementing a service client to:
-///
-/// - Add custom metadata key-value pairs that will propagated to the server
-///   side.
-/// - Control call settings such as compression and authentication.
-/// - Initial and trailing metadata coming from the server.
-/// - Get performance metrics (ie, census).
-///
-/// Context settings are only relevant to the call they are invoked with, that
-/// is to say, they aren't sticky. Some of these settings, such as the
-/// compression options, can be made persistent at channel construction time
-/// (see \a grpc::CreateCustomChannel).
-///
-/// \warning ClientContext instances should \em not be reused across rpcs.
-class ClientContext {
- public:
-  ClientContext();
-  ~ClientContext();
-
-  /// Create a new \a ClientContext as a child of an incoming server call,
-  /// according to \a options (\see PropagationOptions).
-  ///
-  /// \param server_context The source server context to use as the basis for
-  /// constructing the client context.
-  /// \param options The options controlling what to copy from the \a
-  /// server_context.
-  ///
-  /// \return A newly constructed \a ClientContext instance based on \a
-  /// server_context, with traits propagated (copied) according to \a options.
-  static std::unique_ptr<ClientContext> FromServerContext(
-      const ServerContext& server_context,
-      PropagationOptions options = PropagationOptions());
-
-  /// Add the (\a meta_key, \a meta_value) pair to the metadata associated with
-  /// a client call. These are made available at the server side by the \a
-  /// grpc::ServerContext::client_metadata() method.
-  ///
-  /// \warning This method should only be called before invoking the rpc.
-  ///
-  /// \param meta_key The metadata key. If \a meta_value is binary data, it must
-  /// end in "-bin".
-  /// \param meta_value The metadata value. If its value is binary, the key name
-  /// must end in "-bin".
-  void AddMetadata(const grpc::string& meta_key,
-                   const grpc::string& meta_value);
-
-  /// Return a collection of initial metadata key-value pairs. Note that keys
-  /// may happen more than once (ie, a \a std::multimap is returned).
-  ///
-  /// \warning This method should only be called after initial metadata has been
-  /// received. For streaming calls, see \a
-  /// ClientReaderInterface::WaitForInitialMetadata().
-  ///
-  /// \return A multimap of initial metadata key-value pairs from the server.
-  const std::multimap<grpc::string_ref, grpc::string_ref>&
-  GetServerInitialMetadata() const {
-    GPR_CODEGEN_ASSERT(initial_metadata_received_);
-    return *recv_initial_metadata_.map();
-  }
-
-  /// Return a collection of trailing metadata key-value pairs. Note that keys
-  /// may happen more than once (ie, a \a std::multimap is returned).
-  ///
-  /// \warning This method is only callable once the stream has finished.
-  ///
-  /// \return A multimap of metadata trailing key-value pairs from the server.
-  const std::multimap<grpc::string_ref, grpc::string_ref>&
-  GetServerTrailingMetadata() const {
-    // TODO(yangg) check finished
-    return *trailing_metadata_.map();
-  }
-
-  /// Set the deadline for the client call.
-  ///
-  /// \warning This method should only be called before invoking the rpc.
-  ///
-  /// \param deadline the deadline for the client call. Units are determined by
-  /// the type used.
-  template <typename T>
-  void set_deadline(const T& deadline) {
-    TimePoint<T> deadline_tp(deadline);
-    deadline_ = deadline_tp.raw_time();
-  }
-
-  /// EXPERIMENTAL: Indicate that this request is idempotent.
-  /// By default, RPCs are assumed to <i>not</i> be idempotent.
-  ///
-  /// If true, the gRPC library assumes that it's safe to initiate
-  /// this RPC multiple times.
-  void set_idempotent(bool idempotent) { idempotent_ = idempotent; }
-
-  /// EXPERIMENTAL: Set this request to be cacheable.
-  /// If set, grpc is free to use the HTTP GET verb for sending the request,
-  /// with the possibility of receiving a cached response.
-  void set_cacheable(bool cacheable) { cacheable_ = cacheable; }
-
-  /// EXPERIMENTAL: Trigger wait-for-ready or not on this request.
-  /// See https://github.com/grpc/grpc/blob/master/doc/wait-for-ready.md.
-  /// If set, if an RPC is made when a channel's connectivity state is
-  /// TRANSIENT_FAILURE or CONNECTING, the call will not "fail fast",
-  /// and the channel will wait until the channel is READY before making the
-  /// call.
-  void set_wait_for_ready(bool wait_for_ready) {
-    wait_for_ready_ = wait_for_ready;
-    wait_for_ready_explicitly_set_ = true;
-  }
-
-  /// DEPRECATED: Use set_wait_for_ready() instead.
-  void set_fail_fast(bool fail_fast) { set_wait_for_ready(!fail_fast); }
-
-  /// Return the deadline for the client call.
-  std::chrono::system_clock::time_point deadline() const {
-    return Timespec2Timepoint(deadline_);
-  }
-
-  /// Return a \a gpr_timespec representation of the client call's deadline.
-  gpr_timespec raw_deadline() const { return deadline_; }
-
-  /// Set the per call authority header (see
-  /// https://tools.ietf.org/html/rfc7540#section-8.1.2.3).
-  void set_authority(const grpc::string& authority) { authority_ = authority; }
-
-  /// Return the authentication context for this client call.
-  ///
-  /// \see grpc::AuthContext.
-  std::shared_ptr<const AuthContext> auth_context() const {
-    if (auth_context_.get() == nullptr) {
-      auth_context_ = CreateAuthContext(call_);
-    }
-    return auth_context_;
-  }
-
-  /// Set credentials for the client call.
-  ///
-  /// A credentials object encapsulates all the state needed by a client to
-  /// authenticate with a server and make various assertions, e.g., about the
-  /// client’s identity, role, or whether it is authorized to make a particular
-  /// call.
-  ///
-  /// \see  https://grpc.io/docs/guides/auth.html
-  void set_credentials(const std::shared_ptr<CallCredentials>& creds) {
-    creds_ = creds;
-  }
-
-  /// Return the compression algorithm the client call will request be used.
-  /// Note that the gRPC runtime may decide to ignore this request, for example,
-  /// due to resource constraints.
-  grpc_compression_algorithm compression_algorithm() const {
-    return compression_algorithm_;
-  }
-
-  /// Set \a algorithm to be the compression algorithm used for the client call.
-  ///
-  /// \param algorithm The compression algorithm used for the client call.
-  void set_compression_algorithm(grpc_compression_algorithm algorithm);
-
-  /// Flag whether the initial metadata should be \a corked
-  ///
-  /// If \a corked is true, then the initial metadata will be coalesced with the
-  /// write of first message in the stream. As a result, any tag set for the
-  /// initial metadata operation (starting a client-streaming or bidi-streaming
-  /// RPC) will not actually be sent to the completion queue or delivered
-  /// via Next.
-  ///
-  /// \param corked The flag indicating whether the initial metadata is to be
-  /// corked or not.
-  void set_initial_metadata_corked(bool corked) {
-    initial_metadata_corked_ = corked;
-  }
-
-  /// Return the peer uri in a string.
-  ///
-  /// \warning This value is never authenticated or subject to any security
-  /// related code. It must not be used for any authentication related
-  /// functionality. Instead, use auth_context.
-  ///
-  /// \return The call's peer URI.
-  grpc::string peer() const;
-
-  /// Get and set census context.
-  void set_census_context(struct census_context* ccp) { census_context_ = ccp; }
-  struct census_context* census_context() const {
-    return census_context_;
-  }
-
-  /// Send a best-effort out-of-band cancel on the call associated with
-  /// this client context.  The call could be in any stage; e.g., if it is
-  /// already finished, it may still return success.
-  ///
-  /// There is no guarantee the call will be cancelled.
-  ///
-  /// Note that TryCancel() does not change any of the tags that are pending
-  /// on the completion queue. All pending tags will still be delivered
-  /// (though their ok result may reflect the effect of cancellation).
-  void TryCancel();
-
-  /// Global Callbacks
-  ///
-  /// Can be set exactly once per application to install hooks whenever
-  /// a client context is constructed and destructed.
-  class GlobalCallbacks {
-   public:
-    virtual ~GlobalCallbacks() {}
-    virtual void DefaultConstructor(ClientContext* context) = 0;
-    virtual void Destructor(ClientContext* context) = 0;
-  };
-  static void SetGlobalCallbacks(GlobalCallbacks* callbacks);
-
-  /// Should be used for framework-level extensions only.
-  /// Applications never need to call this method.
-  grpc_call* c_call() { return call_; }
-
-  /// EXPERIMENTAL debugging API
-  ///
-  /// if status is not ok() for an RPC, this will return a detailed string
-  /// of the gRPC Core error that led to the failure. It should not be relied
-  /// upon for anything other than gaining more debug data in failure cases.
-  grpc::string debug_error_string() const { return debug_error_string_; }
-
- private:
-  // Disallow copy and assign.
-  ClientContext(const ClientContext&);
-  ClientContext& operator=(const ClientContext&);
-
-  friend class ::grpc::testing::InteropClientContextInspector;
-  friend class ::grpc::internal::CallOpClientRecvStatus;
-  friend class ::grpc::internal::CallOpRecvInitialMetadata;
-  friend class Channel;
-  template <class R>
-  friend class ::grpc::ClientReader;
-  template <class W>
-  friend class ::grpc::ClientWriter;
-  template <class W, class R>
-  friend class ::grpc::ClientReaderWriter;
-  template <class R>
-  friend class ::grpc::ClientAsyncReader;
-  template <class W>
-  friend class ::grpc::ClientAsyncWriter;
-  template <class W, class R>
-  friend class ::grpc::ClientAsyncReaderWriter;
-  template <class R>
-  friend class ::grpc::ClientAsyncResponseReader;
-  template <class InputMessage, class OutputMessage>
-  friend class ::grpc::internal::BlockingUnaryCallImpl;
-
-  // Used by friend class CallOpClientRecvStatus
-  void set_debug_error_string(const grpc::string& debug_error_string) {
-    debug_error_string_ = debug_error_string;
-  }
-
-  grpc_call* call() const { return call_; }
-  void set_call(grpc_call* call, const std::shared_ptr<Channel>& channel);
-
-  uint32_t initial_metadata_flags() const {
-    return (idempotent_ ? GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST : 0) |
-           (wait_for_ready_ ? GRPC_INITIAL_METADATA_WAIT_FOR_READY : 0) |
-           (cacheable_ ? GRPC_INITIAL_METADATA_CACHEABLE_REQUEST : 0) |
-           (wait_for_ready_explicitly_set_
-                ? GRPC_INITIAL_METADATA_WAIT_FOR_READY_EXPLICITLY_SET
-                : 0) |
-           (initial_metadata_corked_ ? GRPC_INITIAL_METADATA_CORKED : 0);
-  }
-
-  grpc::string authority() { return authority_; }
-
-  bool initial_metadata_received_;
-  bool wait_for_ready_;
-  bool wait_for_ready_explicitly_set_;
-  bool idempotent_;
-  bool cacheable_;
-  std::shared_ptr<Channel> channel_;
-  std::mutex mu_;
-  grpc_call* call_;
-  bool call_canceled_;
-  gpr_timespec deadline_;
-  grpc::string authority_;
-  std::shared_ptr<CallCredentials> creds_;
-  mutable std::shared_ptr<const AuthContext> auth_context_;
-  struct census_context* census_context_;
-  std::multimap<grpc::string, grpc::string> send_initial_metadata_;
-  internal::MetadataMap recv_initial_metadata_;
-  internal::MetadataMap trailing_metadata_;
-
-  grpc_call* propagate_from_call_;
-  PropagationOptions propagation_options_;
-
-  grpc_compression_algorithm compression_algorithm_;
-  bool initial_metadata_corked_;
-
-  grpc::string debug_error_string_;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/client_context.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CLIENT_CONTEXT_H
diff --git a/include/grpc++/impl/codegen/client_unary_call.h b/include/grpc++/impl/codegen/client_unary_call.h
index 543e54b972..f7dff1f1f0 100644
--- a/include/grpc++/impl/codegen/client_unary_call.h
+++ b/include/grpc++/impl/codegen/client_unary_call.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,75 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CLIENT_UNARY_CALL_H
 #define GRPCXX_IMPL_CODEGEN_CLIENT_UNARY_CALL_H
 
-#include <grpc++/impl/codegen/call.h>
-#include <grpc++/impl/codegen/channel_interface.h>
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/status.h>
-
-namespace grpc {
-
-class Channel;
-class ClientContext;
-class CompletionQueue;
-
-namespace internal {
-class RpcMethod;
-/// Wrapper that performs a blocking unary call
-template <class InputMessage, class OutputMessage>
-Status BlockingUnaryCall(ChannelInterface* channel, const RpcMethod& method,
-                         ClientContext* context, const InputMessage& request,
-                         OutputMessage* result) {
-  return BlockingUnaryCallImpl<InputMessage, OutputMessage>(
-             channel, method, context, request, result)
-      .status();
-}
-
-template <class InputMessage, class OutputMessage>
-class BlockingUnaryCallImpl {
- public:
-  BlockingUnaryCallImpl(ChannelInterface* channel, const RpcMethod& method,
-                        ClientContext* context, const InputMessage& request,
-                        OutputMessage* result) {
-    CompletionQueue cq(grpc_completion_queue_attributes{
-        GRPC_CQ_CURRENT_VERSION, GRPC_CQ_PLUCK,
-        GRPC_CQ_DEFAULT_POLLING});  // Pluckable completion queue
-    Call call(channel->CreateCall(method, context, &cq));
-    CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage,
-              CallOpRecvInitialMetadata, CallOpRecvMessage<OutputMessage>,
-              CallOpClientSendClose, CallOpClientRecvStatus>
-        ops;
-    status_ = ops.SendMessage(request);
-    if (!status_.ok()) {
-      return;
-    }
-    ops.SendInitialMetadata(context->send_initial_metadata_,
-                            context->initial_metadata_flags());
-    ops.RecvInitialMetadata(context);
-    ops.RecvMessage(result);
-    ops.AllowNoMessage();
-    ops.ClientSendClose();
-    ops.ClientRecvStatus(context, &status_);
-    call.PerformOps(&ops);
-    if (cq.Pluck(&ops)) {
-      if (!ops.got_message && status_.ok()) {
-        status_ = Status(StatusCode::UNIMPLEMENTED,
-                         "No message returned for unary request");
-      }
-    } else {
-      GPR_CODEGEN_ASSERT(!status_.ok());
-    }
-  }
-  Status status() { return status_; }
-
- private:
-  Status status_;
-};
-
-}  // namespace internal
-}  // namespace grpc
+#include <grpcpp/impl/codegen/client_unary_call.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CLIENT_UNARY_CALL_H
diff --git a/include/grpc++/impl/codegen/completion_queue.h b/include/grpc++/impl/codegen/completion_queue.h
index 83477d0489..107549550b 100644
--- a/include/grpc++/impl/codegen/completion_queue.h
+++ b/include/grpc++/impl/codegen/completion_queue.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015-2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,368 +16,13 @@
  *
  */
 
-/// A completion queue implements a concurrent producer-consumer queue, with
-/// two main API-exposed methods: \a Next and \a AsyncNext. These
-/// methods are the essential component of the gRPC C++ asynchronous API.
-/// There is also a \a Shutdown method to indicate that a given completion queue
-/// will no longer have regular events. This must be called before the
-/// completion queue is destroyed.
-/// All completion queue APIs are thread-safe and may be used concurrently with
-/// any other completion queue API invocation; it is acceptable to have
-/// multiple threads calling \a Next or \a AsyncNext on the same or different
-/// completion queues, or to call these methods concurrently with a \a Shutdown
-/// elsewhere.
-/// \remark{All other API calls on completion queue should be completed before
-/// a completion queue destructor is called.}
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_COMPLETION_QUEUE_H
 #define GRPCXX_IMPL_CODEGEN_COMPLETION_QUEUE_H
 
-#include <grpc++/impl/codegen/completion_queue_tag.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/grpc_library.h>
-#include <grpc++/impl/codegen/status.h>
-#include <grpc++/impl/codegen/time.h>
-#include <grpc/impl/codegen/atm.h>
-
-struct grpc_completion_queue;
-
-namespace grpc {
-
-template <class R>
-class ClientReader;
-template <class W>
-class ClientWriter;
-template <class W, class R>
-class ClientReaderWriter;
-template <class R>
-class ServerReader;
-template <class W>
-class ServerWriter;
-namespace internal {
-template <class W, class R>
-class ServerReaderWriterBody;
-}  // namespace internal
-
-class Channel;
-class ChannelInterface;
-class ClientContext;
-class CompletionQueue;
-class Server;
-class ServerBuilder;
-class ServerContext;
-class ServerInterface;
-
-namespace internal {
-class CompletionQueueTag;
-class RpcMethod;
-template <class ServiceType, class RequestType, class ResponseType>
-class RpcMethodHandler;
-template <class ServiceType, class RequestType, class ResponseType>
-class ClientStreamingHandler;
-template <class ServiceType, class RequestType, class ResponseType>
-class ServerStreamingHandler;
-template <class ServiceType, class RequestType, class ResponseType>
-class BidiStreamingHandler;
-class UnknownMethodHandler;
-template <class Streamer, bool WriteNeeded>
-class TemplatedBidiStreamingHandler;
-template <class InputMessage, class OutputMessage>
-class BlockingUnaryCallImpl;
-}  // namespace internal
-
-extern CoreCodegenInterface* g_core_codegen_interface;
-
-/// A thin wrapper around \ref grpc_completion_queue (see \ref
-/// src/core/lib/surface/completion_queue.h).
-/// See \ref doc/cpp/perf_notes.md for notes on best practices for high
-/// performance servers.
-class CompletionQueue : private GrpcLibraryCodegen {
- public:
-  /// Default constructor. Implicitly creates a \a grpc_completion_queue
-  /// instance.
-  CompletionQueue()
-      : CompletionQueue(grpc_completion_queue_attributes{
-            GRPC_CQ_CURRENT_VERSION, GRPC_CQ_NEXT, GRPC_CQ_DEFAULT_POLLING}) {}
-
-  /// Wrap \a take, taking ownership of the instance.
-  ///
-  /// \param take The completion queue instance to wrap. Ownership is taken.
-  explicit CompletionQueue(grpc_completion_queue* take);
-
-  /// Destructor. Destroys the owned wrapped completion queue / instance.
-  ~CompletionQueue() {
-    g_core_codegen_interface->grpc_completion_queue_destroy(cq_);
-  }
-
-  /// Tri-state return for AsyncNext: SHUTDOWN, GOT_EVENT, TIMEOUT.
-  enum NextStatus {
-    SHUTDOWN,   ///< The completion queue has been shutdown and fully-drained
-    GOT_EVENT,  ///< Got a new event; \a tag will be filled in with its
-                ///< associated value; \a ok indicating its success.
-    TIMEOUT     ///< deadline was reached.
-  };
-
-  /// Read from the queue, blocking until an event is available or the queue is
-  /// shutting down.
-  ///
-  /// \param tag[out] Updated to point to the read event's tag.
-  /// \param ok[out] true if read a successful event, false otherwise.
-  ///
-  /// Note that each tag sent to the completion queue (through RPC operations
-  /// or alarms) will be delivered out of the completion queue by a call to
-  /// Next (or a related method), regardless of whether the operation succeeded
-  /// or not. Success here means that this operation completed in the normal
-  /// valid manner.
-  ///
-  /// Server-side RPC request: \a ok indicates that the RPC has indeed
-  /// been started. If it is false, the server has been Shutdown
-  /// before this particular call got matched to an incoming RPC.
-  ///
-  /// Client-side StartCall/RPC invocation: \a ok indicates that the RPC is
-  /// going to go to the wire. If it is false, it not going to the wire. This
-  /// would happen if the channel is either permanently broken or
-  /// transiently broken but with the fail-fast option. (Note that async unary
-  /// RPCs don't post a CQ tag at this point, nor do client-streaming
-  /// or bidi-streaming RPCs that have the initial metadata corked option set.)
-  ///
-  /// Client-side Write, Client-side WritesDone, Server-side Write,
-  /// Server-side Finish, Server-side SendInitialMetadata (which is
-  /// typically included in Write or Finish when not done explicitly):
-  /// \a ok means that the data/metadata/status/etc is going to go to the
-  /// wire. If it is false, it not going to the wire because the call
-  /// is already dead (i.e., canceled, deadline expired, other side
-  /// dropped the channel, etc).
-  ///
-  /// Client-side Read, Server-side Read, Client-side
-  /// RecvInitialMetadata (which is typically included in Read if not
-  /// done explicitly): \a ok indicates whether there is a valid message
-  /// that got read. If not, you know that there are certainly no more
-  /// messages that can ever be read from this stream. For the client-side
-  /// operations, this only happens because the call is dead. For the
-  /// server-sider operation, though, this could happen because the client
-  /// has done a WritesDone already.
-  ///
-  /// Client-side Finish: \a ok should always be true
-  ///
-  /// Server-side AsyncNotifyWhenDone: \a ok should always be true
-  ///
-  /// Alarm: \a ok is true if it expired, false if it was canceled
-  ///
-  /// \return true if got an event, false if the queue is fully drained and
-  ///         shut down.
-  bool Next(void** tag, bool* ok) {
-    return (AsyncNextInternal(tag, ok,
-                              g_core_codegen_interface->gpr_inf_future(
-                                  GPR_CLOCK_REALTIME)) != SHUTDOWN);
-  }
-
-  /// Read from the queue, blocking up to \a deadline (or the queue's shutdown).
-  /// Both \a tag and \a ok are updated upon success (if an event is available
-  /// within the \a deadline).  A \a tag points to an arbitrary location usually
-  /// employed to uniquely identify an event.
-  ///
-  /// \param tag[out] Upon sucess, updated to point to the event's tag.
-  /// \param ok[out] Upon sucess, true if a successful event, false otherwise
-  ///        See documentation for CompletionQueue::Next for explanation of ok
-  /// \param deadline[in] How long to block in wait for an event.
-  ///
-  /// \return The type of event read.
-  template <typename T>
-  NextStatus AsyncNext(void** tag, bool* ok, const T& deadline) {
-    TimePoint<T> deadline_tp(deadline);
-    return AsyncNextInternal(tag, ok, deadline_tp.raw_time());
-  }
-
-  /// EXPERIMENTAL
-  /// First executes \a F, then reads from the queue, blocking up to
-  /// \a deadline (or the queue's shutdown).
-  /// Both \a tag and \a ok are updated upon success (if an event is available
-  /// within the \a deadline).  A \a tag points to an arbitrary location usually
-  /// employed to uniquely identify an event.
-  ///
-  /// \param F[in] Function to execute before calling AsyncNext on this queue.
-  /// \param tag[out] Upon sucess, updated to point to the event's tag.
-  /// \param ok[out] Upon sucess, true if read a regular event, false otherwise.
-  /// \param deadline[in] How long to block in wait for an event.
-  ///
-  /// \return The type of event read.
-  template <typename T, typename F>
-  NextStatus DoThenAsyncNext(F&& f, void** tag, bool* ok, const T& deadline) {
-    CompletionQueueTLSCache cache = CompletionQueueTLSCache(this);
-    f();
-    if (cache.Flush(tag, ok)) {
-      return GOT_EVENT;
-    } else {
-      return AsyncNext(tag, ok, deadline);
-    }
-  }
-
-  /// Request the shutdown of the queue.
-  ///
-  /// \warning This method must be called at some point if this completion queue
-  /// is accessed with Next or AsyncNext. \a Next will not return false
-  /// until this method has been called and all pending tags have been drained.
-  /// (Likewise for \a AsyncNext returning \a NextStatus::SHUTDOWN .)
-  /// Only once either one of these methods does that (that is, once the queue
-  /// has been \em drained) can an instance of this class be destroyed.
-  /// Also note that applications must ensure that no work is enqueued on this
-  /// completion queue after this method is called.
-  void Shutdown();
-
-  /// Returns a \em raw pointer to the underlying \a grpc_completion_queue
-  /// instance.
-  ///
-  /// \warning Remember that the returned instance is owned. No transfer of
-  /// owership is performed.
-  grpc_completion_queue* cq() { return cq_; }
-
- protected:
-  /// Private constructor of CompletionQueue only visible to friend classes
-  CompletionQueue(const grpc_completion_queue_attributes& attributes) {
-    cq_ = g_core_codegen_interface->grpc_completion_queue_create(
-        g_core_codegen_interface->grpc_completion_queue_factory_lookup(
-            &attributes),
-        &attributes, NULL);
-    InitialAvalanching();  // reserve this for the future shutdown
-  }
-
- private:
-  // Friend synchronous wrappers so that they can access Pluck(), which is
-  // a semi-private API geared towards the synchronous implementation.
-  template <class R>
-  friend class ::grpc::ClientReader;
-  template <class W>
-  friend class ::grpc::ClientWriter;
-  template <class W, class R>
-  friend class ::grpc::ClientReaderWriter;
-  template <class R>
-  friend class ::grpc::ServerReader;
-  template <class W>
-  friend class ::grpc::ServerWriter;
-  template <class W, class R>
-  friend class ::grpc::internal::ServerReaderWriterBody;
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class ::grpc::internal::RpcMethodHandler;
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class ::grpc::internal::ClientStreamingHandler;
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class ::grpc::internal::ServerStreamingHandler;
-  template <class Streamer, bool WriteNeeded>
-  friend class ::grpc::internal::TemplatedBidiStreamingHandler;
-  friend class ::grpc::internal::UnknownMethodHandler;
-  friend class ::grpc::Server;
-  friend class ::grpc::ServerContext;
-  friend class ::grpc::ServerInterface;
-  template <class InputMessage, class OutputMessage>
-  friend class ::grpc::internal::BlockingUnaryCallImpl;
-
-  /// EXPERIMENTAL
-  /// Creates a Thread Local cache to store the first event
-  /// On this completion queue queued from this thread.  Once
-  /// initialized, it must be flushed on the same thread.
-  class CompletionQueueTLSCache {
-   public:
-    CompletionQueueTLSCache(CompletionQueue* cq);
-    ~CompletionQueueTLSCache();
-    bool Flush(void** tag, bool* ok);
-
-   private:
-    CompletionQueue* cq_;
-    bool flushed_;
-  };
-
-  NextStatus AsyncNextInternal(void** tag, bool* ok, gpr_timespec deadline);
-
-  /// Wraps \a grpc_completion_queue_pluck.
-  /// \warning Must not be mixed with calls to \a Next.
-  bool Pluck(internal::CompletionQueueTag* tag) {
-    auto deadline =
-        g_core_codegen_interface->gpr_inf_future(GPR_CLOCK_REALTIME);
-    auto ev = g_core_codegen_interface->grpc_completion_queue_pluck(
-        cq_, tag, deadline, nullptr);
-    bool ok = ev.success != 0;
-    void* ignored = tag;
-    GPR_CODEGEN_ASSERT(tag->FinalizeResult(&ignored, &ok));
-    GPR_CODEGEN_ASSERT(ignored == tag);
-    // Ignore mutations by FinalizeResult: Pluck returns the C API status
-    return ev.success != 0;
-  }
-
-  /// Performs a single polling pluck on \a tag.
-  /// \warning Must not be mixed with calls to \a Next.
-  ///
-  /// TODO: sreek - This calls tag->FinalizeResult() even if the cq_ is already
-  /// shutdown. This is most likely a bug and if it is a bug, then change this
-  /// implementation to simple call the other TryPluck function with a zero
-  /// timeout. i.e:
-  ///      TryPluck(tag, gpr_time_0(GPR_CLOCK_REALTIME))
-  void TryPluck(internal::CompletionQueueTag* tag) {
-    auto deadline = g_core_codegen_interface->gpr_time_0(GPR_CLOCK_REALTIME);
-    auto ev = g_core_codegen_interface->grpc_completion_queue_pluck(
-        cq_, tag, deadline, nullptr);
-    if (ev.type == GRPC_QUEUE_TIMEOUT) return;
-    bool ok = ev.success != 0;
-    void* ignored = tag;
-    // the tag must be swallowed if using TryPluck
-    GPR_CODEGEN_ASSERT(!tag->FinalizeResult(&ignored, &ok));
-  }
-
-  /// Performs a single polling pluck on \a tag. Calls tag->FinalizeResult if
-  /// the pluck() was successful and returned the tag.
-  ///
-  /// This exects tag->FinalizeResult (if called) to return 'false' i.e expects
-  /// that the tag is internal not something that is returned to the user.
-  void TryPluck(internal::CompletionQueueTag* tag, gpr_timespec deadline) {
-    auto ev = g_core_codegen_interface->grpc_completion_queue_pluck(
-        cq_, tag, deadline, nullptr);
-    if (ev.type == GRPC_QUEUE_TIMEOUT || ev.type == GRPC_QUEUE_SHUTDOWN) {
-      return;
-    }
-
-    bool ok = ev.success != 0;
-    void* ignored = tag;
-    GPR_CODEGEN_ASSERT(!tag->FinalizeResult(&ignored, &ok));
-  }
-
-  /// Manage state of avalanching operations : completion queue tags that
-  /// trigger other completion queue operations. The underlying core completion
-  /// queue should not really shutdown until all avalanching operations have
-  /// been finalized. Note that we maintain the requirement that an avalanche
-  /// registration must take place before CQ shutdown (which must be maintained
-  /// elsehwere)
-  void InitialAvalanching() {
-    gpr_atm_rel_store(&avalanches_in_flight_, static_cast<gpr_atm>(1));
-  }
-  void RegisterAvalanching() {
-    gpr_atm_no_barrier_fetch_add(&avalanches_in_flight_,
-                                 static_cast<gpr_atm>(1));
-  }
-  void CompleteAvalanching();
-
-  grpc_completion_queue* cq_;  // owned
-
-  gpr_atm avalanches_in_flight_;
-};
-
-/// A specific type of completion queue used by the processing of notifications
-/// by servers. Instantiated by \a ServerBuilder.
-class ServerCompletionQueue : public CompletionQueue {
- public:
-  bool IsFrequentlyPolled() { return polling_type_ != GRPC_CQ_NON_LISTENING; }
-
- private:
-  grpc_cq_polling_type polling_type_;
-  friend class ServerBuilder;
-  /// \param is_frequently_polled Informs the GRPC library about whether the
-  /// server completion queue would be actively polled (by calling Next() or
-  /// AsyncNext()). By default all server completion queues are assumed to be
-  /// frequently polled.
-  ServerCompletionQueue(grpc_cq_polling_type polling_type)
-      : CompletionQueue(grpc_completion_queue_attributes{
-            GRPC_CQ_CURRENT_VERSION, GRPC_CQ_NEXT, polling_type}),
-        polling_type_(polling_type) {}
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/completion_queue.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_COMPLETION_QUEUE_H
diff --git a/include/grpc++/impl/codegen/completion_queue_tag.h b/include/grpc++/impl/codegen/completion_queue_tag.h
index cb16bcf9ff..994fa2a904 100644
--- a/include/grpc++/impl/codegen/completion_queue_tag.h
+++ b/include/grpc++/impl/codegen/completion_queue_tag.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,24 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_COMPLETION_QUEUE_TAG_H
 #define GRPCXX_IMPL_CODEGEN_COMPLETION_QUEUE_TAG_H
 
-namespace grpc {
-
-namespace internal {
-/// An interface allowing implementors to process and filter event tags.
-class CompletionQueueTag {
- public:
-  virtual ~CompletionQueueTag() {}
-  /// Called prior to returning from Next(), return value is the status of the
-  /// operation (return status is the default thing to do). If this function
-  /// returns false, the tag is dropped and not returned from the completion
-  /// queue
-  virtual bool FinalizeResult(void** tag, bool* status) = 0;
-};
-}  // namespace internal
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/completion_queue_tag.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_COMPLETION_QUEUE_TAG_H
diff --git a/include/grpc++/impl/codegen/config.h b/include/grpc++/impl/codegen/config.h
index b5ac9a752e..237bf38d3e 100644
--- a/include/grpc++/impl/codegen/config.h
+++ b/include/grpc++/impl/codegen/config.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,26 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CONFIG_H
 #define GRPCXX_IMPL_CODEGEN_CONFIG_H
 
-#ifndef GRPC_CUSTOM_STRING
-#include <string>
-#define GRPC_CUSTOM_STRING std::string
-#endif
-
-/// The following macros are deprecated and appear only for users
-/// with PB files generated using gRPC 1.0.x plugins. They should
-/// not be used in new code
-#define GRPC_OVERRIDE override  // deprecated
-#define GRPC_FINAL final        // deprecated
-
-namespace grpc {
-
-typedef GRPC_CUSTOM_STRING string;
-
-using std::to_string;
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/config.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CONFIG_H
diff --git a/include/grpc++/impl/codegen/config_protobuf.h b/include/grpc++/impl/codegen/config_protobuf.h
index 7387fa25c6..debd74aae7 100644
--- a/include/grpc++/impl/codegen/config_protobuf.h
+++ b/include/grpc++/impl/codegen/config_protobuf.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,80 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CONFIG_PROTOBUF_H
 #define GRPCXX_IMPL_CODEGEN_CONFIG_PROTOBUF_H
 
-#define GRPC_OPEN_SOURCE_PROTO
-
-#ifndef GRPC_CUSTOM_PROTOBUF_INT64
-#include <google/protobuf/stubs/common.h>
-#define GRPC_CUSTOM_PROTOBUF_INT64 ::google::protobuf::int64
-#endif
-
-#ifndef GRPC_CUSTOM_MESSAGE
-#ifdef GRPC_USE_PROTO_LITE
-#include <google/protobuf/message_lite.h>
-#define GRPC_CUSTOM_MESSAGE ::google::protobuf::MessageLite
-#else
-#include <google/protobuf/message.h>
-#define GRPC_CUSTOM_MESSAGE ::google::protobuf::Message
-#endif
-#endif
-
-#ifndef GRPC_CUSTOM_DESCRIPTOR
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/descriptor.pb.h>
-#define GRPC_CUSTOM_DESCRIPTOR ::google::protobuf::Descriptor
-#define GRPC_CUSTOM_DESCRIPTORPOOL ::google::protobuf::DescriptorPool
-#define GRPC_CUSTOM_FIELDDESCRIPTOR ::google::protobuf::FieldDescriptor
-#define GRPC_CUSTOM_FILEDESCRIPTOR ::google::protobuf::FileDescriptor
-#define GRPC_CUSTOM_FILEDESCRIPTORPROTO ::google::protobuf::FileDescriptorProto
-#define GRPC_CUSTOM_METHODDESCRIPTOR ::google::protobuf::MethodDescriptor
-#define GRPC_CUSTOM_SERVICEDESCRIPTOR ::google::protobuf::ServiceDescriptor
-#define GRPC_CUSTOM_SOURCELOCATION ::google::protobuf::SourceLocation
-#endif
-
-#ifndef GRPC_CUSTOM_DESCRIPTORDATABASE
-#include <google/protobuf/descriptor_database.h>
-#define GRPC_CUSTOM_DESCRIPTORDATABASE ::google::protobuf::DescriptorDatabase
-#define GRPC_CUSTOM_SIMPLEDESCRIPTORDATABASE \
-  ::google::protobuf::SimpleDescriptorDatabase
-#endif
-
-#ifndef GRPC_CUSTOM_ZEROCOPYOUTPUTSTREAM
-#include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/io/zero_copy_stream.h>
-#define GRPC_CUSTOM_ZEROCOPYOUTPUTSTREAM \
-  ::google::protobuf::io::ZeroCopyOutputStream
-#define GRPC_CUSTOM_ZEROCOPYINPUTSTREAM \
-  ::google::protobuf::io::ZeroCopyInputStream
-#define GRPC_CUSTOM_CODEDINPUTSTREAM ::google::protobuf::io::CodedInputStream
-#endif
-
-namespace grpc {
-namespace protobuf {
-
-typedef GRPC_CUSTOM_MESSAGE Message;
-typedef GRPC_CUSTOM_PROTOBUF_INT64 int64;
-
-typedef GRPC_CUSTOM_DESCRIPTOR Descriptor;
-typedef GRPC_CUSTOM_DESCRIPTORPOOL DescriptorPool;
-typedef GRPC_CUSTOM_DESCRIPTORDATABASE DescriptorDatabase;
-typedef GRPC_CUSTOM_FIELDDESCRIPTOR FieldDescriptor;
-typedef GRPC_CUSTOM_FILEDESCRIPTOR FileDescriptor;
-typedef GRPC_CUSTOM_FILEDESCRIPTORPROTO FileDescriptorProto;
-typedef GRPC_CUSTOM_METHODDESCRIPTOR MethodDescriptor;
-typedef GRPC_CUSTOM_SERVICEDESCRIPTOR ServiceDescriptor;
-typedef GRPC_CUSTOM_SIMPLEDESCRIPTORDATABASE SimpleDescriptorDatabase;
-typedef GRPC_CUSTOM_SOURCELOCATION SourceLocation;
-
-namespace io {
-typedef GRPC_CUSTOM_ZEROCOPYOUTPUTSTREAM ZeroCopyOutputStream;
-typedef GRPC_CUSTOM_ZEROCOPYINPUTSTREAM ZeroCopyInputStream;
-typedef GRPC_CUSTOM_CODEDINPUTSTREAM CodedInputStream;
-}  // namespace io
-
-}  // namespace protobuf
-}  // namespace grpc
+#include <grpcpp/impl/codegen/config_protobuf.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CONFIG_PROTOBUF_H
diff --git a/include/grpc++/impl/codegen/core_codegen.h b/include/grpc++/impl/codegen/core_codegen.h
index d7c57bebb9..ee600a9d12 100644
--- a/include/grpc++/impl/codegen/core_codegen.h
+++ b/include/grpc++/impl/codegen/core_codegen.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,102 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CORE_CODEGEN_H
 #define GRPCXX_IMPL_CODEGEN_CORE_CODEGEN_H
 
-// This file should be compiled as part of grpc++.
-
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc/byte_buffer.h>
-#include <grpc/grpc.h>
-#include <grpc/impl/codegen/grpc_types.h>
-
-namespace grpc {
-
-/// Implementation of the core codegen interface.
-class CoreCodegen final : public CoreCodegenInterface {
- private:
-  virtual const grpc_completion_queue_factory*
-  grpc_completion_queue_factory_lookup(
-      const grpc_completion_queue_attributes* attributes) override;
-  virtual grpc_completion_queue* grpc_completion_queue_create(
-      const grpc_completion_queue_factory* factory,
-      const grpc_completion_queue_attributes* attributes,
-      void* reserved) override;
-  grpc_completion_queue* grpc_completion_queue_create_for_next(
-      void* reserved) override;
-  grpc_completion_queue* grpc_completion_queue_create_for_pluck(
-      void* reserved) override;
-  void grpc_completion_queue_destroy(grpc_completion_queue* cq) override;
-  grpc_event grpc_completion_queue_pluck(grpc_completion_queue* cq, void* tag,
-                                         gpr_timespec deadline,
-                                         void* reserved) override;
-
-  void* gpr_malloc(size_t size) override;
-  void gpr_free(void* p) override;
-
-  void grpc_init() override;
-  void grpc_shutdown() override;
-
-  void gpr_mu_init(gpr_mu* mu) override;
-  void gpr_mu_destroy(gpr_mu* mu) override;
-  void gpr_mu_lock(gpr_mu* mu) override;
-  void gpr_mu_unlock(gpr_mu* mu) override;
-  void gpr_cv_init(gpr_cv* cv) override;
-  void gpr_cv_destroy(gpr_cv* cv) override;
-  int gpr_cv_wait(gpr_cv* cv, gpr_mu* mu, gpr_timespec abs_deadline) override;
-  void gpr_cv_signal(gpr_cv* cv) override;
-  void gpr_cv_broadcast(gpr_cv* cv) override;
-
-  grpc_call_error grpc_call_cancel_with_status(grpc_call* call,
-                                               grpc_status_code status,
-                                               const char* description,
-                                               void* reserved) override;
-  void grpc_call_ref(grpc_call* call) override;
-  void grpc_call_unref(grpc_call* call) override;
-  virtual void* grpc_call_arena_alloc(grpc_call* call, size_t length) override;
-
-  grpc_byte_buffer* grpc_byte_buffer_copy(grpc_byte_buffer* bb) override;
-  void grpc_byte_buffer_destroy(grpc_byte_buffer* bb) override;
-
-  int grpc_byte_buffer_reader_init(grpc_byte_buffer_reader* reader,
-                                   grpc_byte_buffer* buffer) override;
-  void grpc_byte_buffer_reader_destroy(
-      grpc_byte_buffer_reader* reader) override;
-  int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader* reader,
-                                   grpc_slice* slice) override;
-
-  grpc_byte_buffer* grpc_raw_byte_buffer_create(grpc_slice* slice,
-                                                size_t nslices) override;
-  grpc_slice grpc_slice_new_with_user_data(void* p, size_t len,
-                                           void (*destroy)(void*),
-                                           void* user_data) override;
-  grpc_slice grpc_empty_slice() override;
-  grpc_slice grpc_slice_malloc(size_t length) override;
-  void grpc_slice_unref(grpc_slice slice) override;
-  grpc_slice grpc_slice_ref(grpc_slice slice) override;
-  grpc_slice grpc_slice_split_tail(grpc_slice* s, size_t split) override;
-  grpc_slice grpc_slice_split_head(grpc_slice* s, size_t split) override;
-  grpc_slice grpc_slice_sub(grpc_slice s, size_t begin, size_t end) override;
-  void grpc_slice_buffer_add(grpc_slice_buffer* sb, grpc_slice slice) override;
-  void grpc_slice_buffer_pop(grpc_slice_buffer* sb) override;
-  grpc_slice grpc_slice_from_static_buffer(const void* buffer,
-                                           size_t length) override;
-  grpc_slice grpc_slice_from_copied_buffer(const void* buffer,
-                                           size_t length) override;
-  void grpc_metadata_array_init(grpc_metadata_array* array) override;
-  void grpc_metadata_array_destroy(grpc_metadata_array* array) override;
-
-  gpr_timespec gpr_inf_future(gpr_clock_type type) override;
-  gpr_timespec gpr_time_0(gpr_clock_type type) override;
-
-  virtual const Status& ok() override;
-  virtual const Status& cancelled() override;
-
-  void assert_fail(const char* failed_assertion, const char* file,
-                   int line) override;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/core_codegen.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CORE_CODEGEN_H
diff --git a/include/grpc++/impl/codegen/core_codegen_interface.h b/include/grpc++/impl/codegen/core_codegen_interface.h
index d7ad7a4b57..03b3f675e1 100644
--- a/include/grpc++/impl/codegen/core_codegen_interface.h
+++ b/include/grpc++/impl/codegen/core_codegen_interface.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,125 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CORE_CODEGEN_INTERFACE_H
 #define GRPCXX_IMPL_CODEGEN_CORE_CODEGEN_INTERFACE_H
 
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/status.h>
-#include <grpc/impl/codegen/byte_buffer_reader.h>
-#include <grpc/impl/codegen/grpc_types.h>
-#include <grpc/impl/codegen/sync.h>
-
-namespace grpc {
-
-/// Interface between the codegen library and the minimal subset of core
-/// features required by the generated code.
-///
-/// All undocumented methods are simply forwarding the call to their namesakes.
-/// Please refer to their corresponding documentation for details.
-///
-/// \warning This interface should be considered internal and private.
-class CoreCodegenInterface {
- public:
-  /// Upon a failed assertion, log the error.
-  virtual void assert_fail(const char* failed_assertion, const char* file,
-                           int line) = 0;
-
-  virtual const grpc_completion_queue_factory*
-  grpc_completion_queue_factory_lookup(
-      const grpc_completion_queue_attributes* attributes) = 0;
-  virtual grpc_completion_queue* grpc_completion_queue_create(
-      const grpc_completion_queue_factory* factory,
-      const grpc_completion_queue_attributes* attributes, void* reserved) = 0;
-  virtual grpc_completion_queue* grpc_completion_queue_create_for_next(
-      void* reserved) = 0;
-  virtual grpc_completion_queue* grpc_completion_queue_create_for_pluck(
-      void* reserved) = 0;
-  virtual void grpc_completion_queue_destroy(grpc_completion_queue* cq) = 0;
-  virtual grpc_event grpc_completion_queue_pluck(grpc_completion_queue* cq,
-                                                 void* tag,
-                                                 gpr_timespec deadline,
-                                                 void* reserved) = 0;
-
-  virtual void* gpr_malloc(size_t size) = 0;
-  virtual void gpr_free(void* p) = 0;
-
-  // These are only to be used to fix edge cases involving grpc_init and
-  // grpc_shutdown. Calling grpc_init from the codegen interface before
-  // the real grpc_init is called will cause a crash, so if you use this
-  // function, ensure that it is not the first call to grpc_init.
-  virtual void grpc_init() = 0;
-  virtual void grpc_shutdown() = 0;
-
-  virtual void gpr_mu_init(gpr_mu* mu) = 0;
-  virtual void gpr_mu_destroy(gpr_mu* mu) = 0;
-  virtual void gpr_mu_lock(gpr_mu* mu) = 0;
-  virtual void gpr_mu_unlock(gpr_mu* mu) = 0;
-  virtual void gpr_cv_init(gpr_cv* cv) = 0;
-  virtual void gpr_cv_destroy(gpr_cv* cv) = 0;
-  virtual int gpr_cv_wait(gpr_cv* cv, gpr_mu* mu,
-                          gpr_timespec abs_deadline) = 0;
-  virtual void gpr_cv_signal(gpr_cv* cv) = 0;
-  virtual void gpr_cv_broadcast(gpr_cv* cv) = 0;
-
-  virtual grpc_byte_buffer* grpc_byte_buffer_copy(grpc_byte_buffer* bb) = 0;
-  virtual void grpc_byte_buffer_destroy(grpc_byte_buffer* bb) = 0;
-
-  virtual int grpc_byte_buffer_reader_init(grpc_byte_buffer_reader* reader,
-                                           grpc_byte_buffer* buffer)
-      GRPC_MUST_USE_RESULT = 0;
-  virtual void grpc_byte_buffer_reader_destroy(
-      grpc_byte_buffer_reader* reader) = 0;
-  virtual int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader* reader,
-                                           grpc_slice* slice) = 0;
-
-  virtual grpc_byte_buffer* grpc_raw_byte_buffer_create(grpc_slice* slice,
-                                                        size_t nslices) = 0;
-  virtual grpc_slice grpc_slice_new_with_user_data(void* p, size_t len,
-                                                   void (*destroy)(void*),
-                                                   void* user_data) = 0;
-  virtual grpc_call_error grpc_call_cancel_with_status(grpc_call* call,
-                                                       grpc_status_code status,
-                                                       const char* description,
-                                                       void* reserved) = 0;
-  virtual void grpc_call_ref(grpc_call* call) = 0;
-  virtual void grpc_call_unref(grpc_call* call) = 0;
-  virtual void* grpc_call_arena_alloc(grpc_call* call, size_t length) = 0;
-  virtual grpc_slice grpc_empty_slice() = 0;
-  virtual grpc_slice grpc_slice_malloc(size_t length) = 0;
-  virtual void grpc_slice_unref(grpc_slice slice) = 0;
-  virtual grpc_slice grpc_slice_ref(grpc_slice slice) = 0;
-  virtual grpc_slice grpc_slice_split_tail(grpc_slice* s, size_t split) = 0;
-  virtual grpc_slice grpc_slice_split_head(grpc_slice* s, size_t split) = 0;
-  virtual grpc_slice grpc_slice_sub(grpc_slice s, size_t begin, size_t end) = 0;
-  virtual void grpc_slice_buffer_add(grpc_slice_buffer* sb,
-                                     grpc_slice slice) = 0;
-  virtual void grpc_slice_buffer_pop(grpc_slice_buffer* sb) = 0;
-  virtual grpc_slice grpc_slice_from_static_buffer(const void* buffer,
-                                                   size_t length) = 0;
-  virtual grpc_slice grpc_slice_from_copied_buffer(const void* buffer,
-                                                   size_t length) = 0;
-
-  virtual void grpc_metadata_array_init(grpc_metadata_array* array) = 0;
-  virtual void grpc_metadata_array_destroy(grpc_metadata_array* array) = 0;
-
-  virtual const Status& ok() = 0;
-  virtual const Status& cancelled() = 0;
-
-  virtual gpr_timespec gpr_inf_future(gpr_clock_type type) = 0;
-  virtual gpr_timespec gpr_time_0(gpr_clock_type type) = 0;
-};
-
-extern CoreCodegenInterface* g_core_codegen_interface;
-
-/// Codegen specific version of \a GPR_ASSERT.
-#define GPR_CODEGEN_ASSERT(x)                                              \
-  do {                                                                     \
-    if (!(x)) {                                                            \
-      grpc::g_core_codegen_interface->assert_fail(#x, __FILE__, __LINE__); \
-    }                                                                      \
-  } while (0)
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/core_codegen_interface.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CORE_CODEGEN_INTERFACE_H
diff --git a/include/grpc++/impl/codegen/create_auth_context.h b/include/grpc++/impl/codegen/create_auth_context.h
index afa6302c00..ef89229f4d 100644
--- a/include/grpc++/impl/codegen/create_auth_context.h
+++ b/include/grpc++/impl/codegen/create_auth_context.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,18 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_CREATE_AUTH_CONTEXT_H
 #define GRPCXX_IMPL_CODEGEN_CREATE_AUTH_CONTEXT_H
 
-#include <memory>
-
-#include <grpc++/impl/codegen/security/auth_context.h>
-#include <grpc/impl/codegen/grpc_types.h>
-
-namespace grpc {
-
-std::shared_ptr<const AuthContext> CreateAuthContext(grpc_call* call);
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/create_auth_context.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_CREATE_AUTH_CONTEXT_H
diff --git a/include/grpc++/impl/codegen/grpc_library.h b/include/grpc++/impl/codegen/grpc_library.h
index 6036ad7eaa..33c3e2546c 100644
--- a/include/grpc++/impl/codegen/grpc_library.h
+++ b/include/grpc++/impl/codegen/grpc_library.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,48 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_GRPC_LIBRARY_H
 #define GRPCXX_IMPL_CODEGEN_GRPC_LIBRARY_H
 
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-
-namespace grpc {
-
-class GrpcLibraryInterface {
- public:
-  virtual void init() = 0;
-  virtual void shutdown() = 0;
-};
-
-/// Initialized by \a grpc::GrpcLibraryInitializer from
-/// <grpc++/impl/grpc_library.h>
-extern GrpcLibraryInterface* g_glip;
-
-/// Classes that require gRPC to be initialized should inherit from this class.
-class GrpcLibraryCodegen {
- public:
-  GrpcLibraryCodegen(bool call_grpc_init = true) : grpc_init_called_(false) {
-    if (call_grpc_init) {
-      GPR_CODEGEN_ASSERT(g_glip &&
-                         "gRPC library not initialized. See "
-                         "grpc::internal::GrpcLibraryInitializer.");
-      g_glip->init();
-      grpc_init_called_ = true;
-    }
-  }
-  virtual ~GrpcLibraryCodegen() {
-    if (grpc_init_called_) {
-      GPR_CODEGEN_ASSERT(g_glip &&
-                         "gRPC library not initialized. See "
-                         "grpc::internal::GrpcLibraryInitializer.");
-      g_glip->shutdown();
-    }
-  }
-
- private:
-  bool grpc_init_called_;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/grpc_library.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_GRPC_LIBRARY_H
diff --git a/include/grpc++/impl/codegen/metadata_map.h b/include/grpc++/impl/codegen/metadata_map.h
index 8dc7211ba8..41c5ad375e 100644
--- a/include/grpc++/impl/codegen/metadata_map.h
+++ b/include/grpc++/impl/codegen/metadata_map.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,43 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_METADATA_MAP_H
 #define GRPCXX_IMPL_CODEGEN_METADATA_MAP_H
 
-#include <grpc++/impl/codegen/slice.h>
-
-namespace grpc {
-
-namespace internal {
-class MetadataMap {
- public:
-  MetadataMap() { memset(&arr_, 0, sizeof(arr_)); }
-
-  ~MetadataMap() {
-    g_core_codegen_interface->grpc_metadata_array_destroy(&arr_);
-  }
-
-  void FillMap() {
-    for (size_t i = 0; i < arr_.count; i++) {
-      // TODO(yangg) handle duplicates?
-      map_.insert(std::pair<grpc::string_ref, grpc::string_ref>(
-          StringRefFromSlice(&arr_.metadata[i].key),
-          StringRefFromSlice(&arr_.metadata[i].value)));
-    }
-  }
-
-  std::multimap<grpc::string_ref, grpc::string_ref>* map() { return &map_; }
-  const std::multimap<grpc::string_ref, grpc::string_ref>* map() const {
-    return &map_;
-  }
-  grpc_metadata_array* arr() { return &arr_; }
-
- private:
-  grpc_metadata_array arr_;
-  std::multimap<grpc::string_ref, grpc::string_ref> map_;
-};
-}  // namespace internal
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/metadata_map.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_METADATA_MAP_H
diff --git a/include/grpc++/impl/codegen/method_handler_impl.h b/include/grpc++/impl/codegen/method_handler_impl.h
index daf090f86c..0bdb620616 100644
--- a/include/grpc++/impl/codegen/method_handler_impl.h
+++ b/include/grpc++/impl/codegen/method_handler_impl.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,287 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_METHOD_HANDLER_IMPL_H
 #define GRPCXX_IMPL_CODEGEN_METHOD_HANDLER_IMPL_H
 
-#include <grpc++/impl/codegen/byte_buffer.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/rpc_service_method.h>
-#include <grpc++/impl/codegen/sync_stream.h>
-
-namespace grpc {
-
-namespace internal {
-
-// Invoke the method handler, fill in the status, and
-// return whether or not we finished safely (without an exception).
-// Note that exception handling is 0-cost in most compiler/library
-// implementations (except when an exception is actually thrown),
-// so this process doesn't require additional overhead in the common case.
-// Additionally, we don't need to return if we caught an exception or not;
-// the handling is the same in either case.
-template <class Callable>
-Status CatchingFunctionHandler(Callable&& handler) {
-#if GRPC_ALLOW_EXCEPTIONS
-  try {
-    return handler();
-  } catch (...) {
-    return Status(StatusCode::UNKNOWN, "Unexpected error in RPC handling");
-  }
-#else   // GRPC_ALLOW_EXCEPTIONS
-  return handler();
-#endif  // GRPC_ALLOW_EXCEPTIONS
-}
-
-/// A wrapper class of an application provided rpc method handler.
-template <class ServiceType, class RequestType, class ResponseType>
-class RpcMethodHandler : public MethodHandler {
- public:
-  RpcMethodHandler(std::function<Status(ServiceType*, ServerContext*,
-                                        const RequestType*, ResponseType*)>
-                       func,
-                   ServiceType* service)
-      : func_(func), service_(service) {}
-
-  void RunHandler(const HandlerParameter& param) final {
-    RequestType req;
-    Status status = SerializationTraits<RequestType>::Deserialize(
-        param.request.bbuf_ptr(), &req);
-    ResponseType rsp;
-    if (status.ok()) {
-      status = CatchingFunctionHandler([this, &param, &req, &rsp] {
-        return func_(service_, param.server_context, &req, &rsp);
-      });
-    }
-
-    GPR_CODEGEN_ASSERT(!param.server_context->sent_initial_metadata_);
-    CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage,
-              CallOpServerSendStatus>
-        ops;
-    ops.SendInitialMetadata(param.server_context->initial_metadata_,
-                            param.server_context->initial_metadata_flags());
-    if (param.server_context->compression_level_set()) {
-      ops.set_compression_level(param.server_context->compression_level());
-    }
-    if (status.ok()) {
-      status = ops.SendMessage(rsp);
-    }
-    ops.ServerSendStatus(param.server_context->trailing_metadata_, status);
-    param.call->PerformOps(&ops);
-    param.call->cq()->Pluck(&ops);
-  }
-
- private:
-  /// Application provided rpc handler function.
-  std::function<Status(ServiceType*, ServerContext*, const RequestType*,
-                       ResponseType*)>
-      func_;
-  // The class the above handler function lives in.
-  ServiceType* service_;
-};
-
-/// A wrapper class of an application provided client streaming handler.
-template <class ServiceType, class RequestType, class ResponseType>
-class ClientStreamingHandler : public MethodHandler {
- public:
-  ClientStreamingHandler(
-      std::function<Status(ServiceType*, ServerContext*,
-                           ServerReader<RequestType>*, ResponseType*)>
-          func,
-      ServiceType* service)
-      : func_(func), service_(service) {}
-
-  void RunHandler(const HandlerParameter& param) final {
-    ServerReader<RequestType> reader(param.call, param.server_context);
-    ResponseType rsp;
-    Status status = CatchingFunctionHandler([this, &param, &reader, &rsp] {
-      return func_(service_, param.server_context, &reader, &rsp);
-    });
-
-    GPR_CODEGEN_ASSERT(!param.server_context->sent_initial_metadata_);
-    CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage,
-              CallOpServerSendStatus>
-        ops;
-    ops.SendInitialMetadata(param.server_context->initial_metadata_,
-                            param.server_context->initial_metadata_flags());
-    if (param.server_context->compression_level_set()) {
-      ops.set_compression_level(param.server_context->compression_level());
-    }
-    if (status.ok()) {
-      status = ops.SendMessage(rsp);
-    }
-    ops.ServerSendStatus(param.server_context->trailing_metadata_, status);
-    param.call->PerformOps(&ops);
-    param.call->cq()->Pluck(&ops);
-  }
-
- private:
-  std::function<Status(ServiceType*, ServerContext*, ServerReader<RequestType>*,
-                       ResponseType*)>
-      func_;
-  ServiceType* service_;
-};
-
-/// A wrapper class of an application provided server streaming handler.
-template <class ServiceType, class RequestType, class ResponseType>
-class ServerStreamingHandler : public MethodHandler {
- public:
-  ServerStreamingHandler(
-      std::function<Status(ServiceType*, ServerContext*, const RequestType*,
-                           ServerWriter<ResponseType>*)>
-          func,
-      ServiceType* service)
-      : func_(func), service_(service) {}
-
-  void RunHandler(const HandlerParameter& param) final {
-    RequestType req;
-    Status status = SerializationTraits<RequestType>::Deserialize(
-        param.request.bbuf_ptr(), &req);
-
-    if (status.ok()) {
-      ServerWriter<ResponseType> writer(param.call, param.server_context);
-      status = CatchingFunctionHandler([this, &param, &req, &writer] {
-        return func_(service_, param.server_context, &req, &writer);
-      });
-    }
-
-    CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops;
-    if (!param.server_context->sent_initial_metadata_) {
-      ops.SendInitialMetadata(param.server_context->initial_metadata_,
-                              param.server_context->initial_metadata_flags());
-      if (param.server_context->compression_level_set()) {
-        ops.set_compression_level(param.server_context->compression_level());
-      }
-    }
-    ops.ServerSendStatus(param.server_context->trailing_metadata_, status);
-    param.call->PerformOps(&ops);
-    if (param.server_context->has_pending_ops_) {
-      param.call->cq()->Pluck(&param.server_context->pending_ops_);
-    }
-    param.call->cq()->Pluck(&ops);
-  }
-
- private:
-  std::function<Status(ServiceType*, ServerContext*, const RequestType*,
-                       ServerWriter<ResponseType>*)>
-      func_;
-  ServiceType* service_;
-};
-
-/// A wrapper class of an application provided bidi-streaming handler.
-/// This also applies to server-streamed implementation of a unary method
-/// with the additional requirement that such methods must have done a
-/// write for status to be ok
-/// Since this is used by more than 1 class, the service is not passed in.
-/// Instead, it is expected to be an implicitly-captured argument of func
-/// (through bind or something along those lines)
-template <class Streamer, bool WriteNeeded>
-class TemplatedBidiStreamingHandler : public MethodHandler {
- public:
-  TemplatedBidiStreamingHandler(
-      std::function<Status(ServerContext*, Streamer*)> func)
-      : func_(func), write_needed_(WriteNeeded) {}
-
-  void RunHandler(const HandlerParameter& param) final {
-    Streamer stream(param.call, param.server_context);
-    Status status = CatchingFunctionHandler([this, &param, &stream] {
-      return func_(param.server_context, &stream);
-    });
-
-    CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops;
-    if (!param.server_context->sent_initial_metadata_) {
-      ops.SendInitialMetadata(param.server_context->initial_metadata_,
-                              param.server_context->initial_metadata_flags());
-      if (param.server_context->compression_level_set()) {
-        ops.set_compression_level(param.server_context->compression_level());
-      }
-      if (write_needed_ && status.ok()) {
-        // If we needed a write but never did one, we need to mark the
-        // status as a fail
-        status = Status(StatusCode::INTERNAL,
-                        "Service did not provide response message");
-      }
-    }
-    ops.ServerSendStatus(param.server_context->trailing_metadata_, status);
-    param.call->PerformOps(&ops);
-    if (param.server_context->has_pending_ops_) {
-      param.call->cq()->Pluck(&param.server_context->pending_ops_);
-    }
-    param.call->cq()->Pluck(&ops);
-  }
-
- private:
-  std::function<Status(ServerContext*, Streamer*)> func_;
-  const bool write_needed_;
-};
-
-template <class ServiceType, class RequestType, class ResponseType>
-class BidiStreamingHandler
-    : public TemplatedBidiStreamingHandler<
-          ServerReaderWriter<ResponseType, RequestType>, false> {
- public:
-  BidiStreamingHandler(
-      std::function<Status(ServiceType*, ServerContext*,
-                           ServerReaderWriter<ResponseType, RequestType>*)>
-          func,
-      ServiceType* service)
-      : TemplatedBidiStreamingHandler<
-            ServerReaderWriter<ResponseType, RequestType>, false>(std::bind(
-            func, service, std::placeholders::_1, std::placeholders::_2)) {}
-};
-
-template <class RequestType, class ResponseType>
-class StreamedUnaryHandler
-    : public TemplatedBidiStreamingHandler<
-          ServerUnaryStreamer<RequestType, ResponseType>, true> {
- public:
-  explicit StreamedUnaryHandler(
-      std::function<Status(ServerContext*,
-                           ServerUnaryStreamer<RequestType, ResponseType>*)>
-          func)
-      : TemplatedBidiStreamingHandler<
-            ServerUnaryStreamer<RequestType, ResponseType>, true>(func) {}
-};
-
-template <class RequestType, class ResponseType>
-class SplitServerStreamingHandler
-    : public TemplatedBidiStreamingHandler<
-          ServerSplitStreamer<RequestType, ResponseType>, false> {
- public:
-  explicit SplitServerStreamingHandler(
-      std::function<Status(ServerContext*,
-                           ServerSplitStreamer<RequestType, ResponseType>*)>
-          func)
-      : TemplatedBidiStreamingHandler<
-            ServerSplitStreamer<RequestType, ResponseType>, false>(func) {}
-};
-
-/// Handle unknown method by returning UNIMPLEMENTED error.
-class UnknownMethodHandler : public MethodHandler {
- public:
-  template <class T>
-  static void FillOps(ServerContext* context, T* ops) {
-    Status status(StatusCode::UNIMPLEMENTED, "");
-    if (!context->sent_initial_metadata_) {
-      ops->SendInitialMetadata(context->initial_metadata_,
-                               context->initial_metadata_flags());
-      if (context->compression_level_set()) {
-        ops->set_compression_level(context->compression_level());
-      }
-      context->sent_initial_metadata_ = true;
-    }
-    ops->ServerSendStatus(context->trailing_metadata_, status);
-  }
-
-  void RunHandler(const HandlerParameter& param) final {
-    CallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus> ops;
-    FillOps(param.server_context, &ops);
-    param.call->PerformOps(&ops);
-    param.call->cq()->Pluck(&ops);
-  }
-};
-
-}  // namespace internal
-}  // namespace grpc
+#include <grpcpp/impl/codegen/method_handler_impl.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_METHOD_HANDLER_IMPL_H
diff --git a/include/grpc++/impl/codegen/proto_utils.h b/include/grpc++/impl/codegen/proto_utils.h
index 209250bba2..1f47884abc 100644
--- a/include/grpc++/impl/codegen/proto_utils.h
+++ b/include/grpc++/impl/codegen/proto_utils.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,253 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_PROTO_UTILS_H
 #define GRPCXX_IMPL_CODEGEN_PROTO_UTILS_H
 
-#include <type_traits>
-
-#include <grpc++/impl/codegen/config_protobuf.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/serialization_traits.h>
-#include <grpc++/impl/codegen/status.h>
-#include <grpc/impl/codegen/byte_buffer_reader.h>
-#include <grpc/impl/codegen/grpc_types.h>
-#include <grpc/impl/codegen/slice.h>
-
-namespace grpc {
-
-extern CoreCodegenInterface* g_core_codegen_interface;
-
-namespace internal {
-
-class GrpcBufferWriterPeer;
-
-const int kGrpcBufferWriterMaxBufferLength = 1024 * 1024;
-
-class GrpcBufferWriter : public ::grpc::protobuf::io::ZeroCopyOutputStream {
- public:
-  GrpcBufferWriter(grpc_byte_buffer** bp, int block_size, int total_size)
-      : block_size_(block_size),
-        total_size_(total_size),
-        byte_count_(0),
-        have_backup_(false) {
-    *bp = g_core_codegen_interface->grpc_raw_byte_buffer_create(NULL, 0);
-    slice_buffer_ = &(*bp)->data.raw.slice_buffer;
-  }
-
-  ~GrpcBufferWriter() override {
-    if (have_backup_) {
-      g_core_codegen_interface->grpc_slice_unref(backup_slice_);
-    }
-  }
-
-  bool Next(void** data, int* size) override {
-    // Protobuf should not ask for more memory than total_size_.
-    GPR_CODEGEN_ASSERT(byte_count_ < total_size_);
-    size_t remain = total_size_ - byte_count_;
-    if (have_backup_) {
-      slice_ = backup_slice_;
-      have_backup_ = false;
-      if (GRPC_SLICE_LENGTH(slice_) > remain) {
-        GRPC_SLICE_SET_LENGTH(slice_, remain);
-      }
-    } else {
-      // When less than a whole block is needed, only allocate that much.
-      // But make sure the allocated slice is not inlined.
-      size_t allocate_length =
-          remain > static_cast<size_t>(block_size_) ? block_size_ : remain;
-      slice_ = g_core_codegen_interface->grpc_slice_malloc(
-          allocate_length > GRPC_SLICE_INLINED_SIZE
-              ? allocate_length
-              : GRPC_SLICE_INLINED_SIZE + 1);
-    }
-    *data = GRPC_SLICE_START_PTR(slice_);
-    // On win x64, int is only 32bit
-    GPR_CODEGEN_ASSERT(GRPC_SLICE_LENGTH(slice_) <= INT_MAX);
-    byte_count_ += * size = (int)GRPC_SLICE_LENGTH(slice_);
-    g_core_codegen_interface->grpc_slice_buffer_add(slice_buffer_, slice_);
-    return true;
-  }
-
-  void BackUp(int count) override {
-    g_core_codegen_interface->grpc_slice_buffer_pop(slice_buffer_);
-    if ((size_t)count == GRPC_SLICE_LENGTH(slice_)) {
-      backup_slice_ = slice_;
-    } else {
-      backup_slice_ = g_core_codegen_interface->grpc_slice_split_tail(
-          &slice_, GRPC_SLICE_LENGTH(slice_) - count);
-      g_core_codegen_interface->grpc_slice_buffer_add(slice_buffer_, slice_);
-    }
-    // It's dangerous to keep an inlined grpc_slice as the backup slice, since
-    // on a following Next() call, a reference will be returned to this slice
-    // via GRPC_SLICE_START_PTR, which will not be an adddress held by
-    // slice_buffer_.
-    have_backup_ = backup_slice_.refcount != NULL;
-    byte_count_ -= count;
-  }
-
-  grpc::protobuf::int64 ByteCount() const override { return byte_count_; }
-
- protected:
-  friend class GrpcBufferWriterPeer;
-  const int block_size_;
-  const int total_size_;
-  int64_t byte_count_;
-  grpc_slice_buffer* slice_buffer_;
-  bool have_backup_;
-  grpc_slice backup_slice_;
-  grpc_slice slice_;
-};
-
-class GrpcBufferReader : public ::grpc::protobuf::io::ZeroCopyInputStream {
- public:
-  explicit GrpcBufferReader(grpc_byte_buffer* buffer)
-      : byte_count_(0), backup_count_(0), status_() {
-    if (!g_core_codegen_interface->grpc_byte_buffer_reader_init(&reader_,
-                                                                buffer)) {
-      status_ = Status(StatusCode::INTERNAL,
-                       "Couldn't initialize byte buffer reader");
-    }
-  }
-  ~GrpcBufferReader() override {
-    g_core_codegen_interface->grpc_byte_buffer_reader_destroy(&reader_);
-  }
-
-  bool Next(const void** data, int* size) override {
-    if (!status_.ok()) {
-      return false;
-    }
-    if (backup_count_ > 0) {
-      *data = GRPC_SLICE_START_PTR(slice_) + GRPC_SLICE_LENGTH(slice_) -
-              backup_count_;
-      GPR_CODEGEN_ASSERT(backup_count_ <= INT_MAX);
-      *size = (int)backup_count_;
-      backup_count_ = 0;
-      return true;
-    }
-    if (!g_core_codegen_interface->grpc_byte_buffer_reader_next(&reader_,
-                                                                &slice_)) {
-      return false;
-    }
-    g_core_codegen_interface->grpc_slice_unref(slice_);
-    *data = GRPC_SLICE_START_PTR(slice_);
-    // On win x64, int is only 32bit
-    GPR_CODEGEN_ASSERT(GRPC_SLICE_LENGTH(slice_) <= INT_MAX);
-    byte_count_ += * size = (int)GRPC_SLICE_LENGTH(slice_);
-    return true;
-  }
-
-  Status status() const { return status_; }
-
-  void BackUp(int count) override { backup_count_ = count; }
-
-  bool Skip(int count) override {
-    const void* data;
-    int size;
-    while (Next(&data, &size)) {
-      if (size >= count) {
-        BackUp(size - count);
-        return true;
-      }
-      // size < count;
-      count -= size;
-    }
-    // error or we have too large count;
-    return false;
-  }
-
-  grpc::protobuf::int64 ByteCount() const override {
-    return byte_count_ - backup_count_;
-  }
-
- protected:
-  int64_t byte_count_;
-  int64_t backup_count_;
-  grpc_byte_buffer_reader reader_;
-  grpc_slice slice_;
-  Status status_;
-};
-
-// BufferWriter must be a subclass of io::ZeroCopyOutputStream.
-template <class BufferWriter, class T>
-Status GenericSerialize(const grpc::protobuf::Message& msg,
-                        grpc_byte_buffer** bp, bool* own_buffer) {
-  static_assert(
-      std::is_base_of<protobuf::io::ZeroCopyOutputStream, BufferWriter>::value,
-      "BufferWriter must be a subclass of io::ZeroCopyOutputStream");
-  *own_buffer = true;
-  int byte_size = msg.ByteSize();
-  if ((size_t)byte_size <= GRPC_SLICE_INLINED_SIZE) {
-    grpc_slice slice = g_core_codegen_interface->grpc_slice_malloc(byte_size);
-    GPR_CODEGEN_ASSERT(
-        GRPC_SLICE_END_PTR(slice) ==
-        msg.SerializeWithCachedSizesToArray(GRPC_SLICE_START_PTR(slice)));
-    *bp = g_core_codegen_interface->grpc_raw_byte_buffer_create(&slice, 1);
-    g_core_codegen_interface->grpc_slice_unref(slice);
-
-    return g_core_codegen_interface->ok();
-  }
-  BufferWriter writer(bp, kGrpcBufferWriterMaxBufferLength, byte_size);
-  return msg.SerializeToZeroCopyStream(&writer)
-             ? g_core_codegen_interface->ok()
-             : Status(StatusCode::INTERNAL, "Failed to serialize message");
-}
-
-// BufferReader must be a subclass of io::ZeroCopyInputStream.
-template <class BufferReader, class T>
-Status GenericDeserialize(grpc_byte_buffer* buffer,
-                          grpc::protobuf::Message* msg) {
-  static_assert(
-      std::is_base_of<protobuf::io::ZeroCopyInputStream, BufferReader>::value,
-      "BufferReader must be a subclass of io::ZeroCopyInputStream");
-  if (buffer == nullptr) {
-    return Status(StatusCode::INTERNAL, "No payload");
-  }
-  Status result = g_core_codegen_interface->ok();
-  {
-    BufferReader reader(buffer);
-    if (!reader.status().ok()) {
-      return reader.status();
-    }
-    ::grpc::protobuf::io::CodedInputStream decoder(&reader);
-    decoder.SetTotalBytesLimit(INT_MAX, INT_MAX);
-    if (!msg->ParseFromCodedStream(&decoder)) {
-      result = Status(StatusCode::INTERNAL, msg->InitializationErrorString());
-    }
-    if (!decoder.ConsumedEntireMessage()) {
-      result = Status(StatusCode::INTERNAL, "Did not read entire message");
-    }
-  }
-  g_core_codegen_interface->grpc_byte_buffer_destroy(buffer);
-  return result;
-}
-
-}  // namespace internal
-
-// this is needed so the following class does not conflict with protobuf
-// serializers that utilize internal-only tools.
-#ifdef GRPC_OPEN_SOURCE_PROTO
-// This class provides a protobuf serializer. It translates between protobuf
-// objects and grpc_byte_buffers. More information about SerializationTraits can
-// be found in include/grpc++/impl/codegen/serialization_traits.h.
-template <class T>
-class SerializationTraits<T, typename std::enable_if<std::is_base_of<
-                                 grpc::protobuf::Message, T>::value>::type> {
- public:
-  static Status Serialize(const grpc::protobuf::Message& msg,
-                          grpc_byte_buffer** bp, bool* own_buffer) {
-    return internal::GenericSerialize<internal::GrpcBufferWriter, T>(
-        msg, bp, own_buffer);
-  }
-
-  static Status Deserialize(grpc_byte_buffer* buffer,
-                            grpc::protobuf::Message* msg) {
-    return internal::GenericDeserialize<internal::GrpcBufferReader, T>(buffer,
-                                                                       msg);
-  }
-};
-#endif
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/proto_utils.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_PROTO_UTILS_H
diff --git a/include/grpc++/impl/codegen/rpc_method.h b/include/grpc++/impl/codegen/rpc_method.h
index 54e52364ef..2906c74dda 100644
--- a/include/grpc++/impl/codegen/rpc_method.h
+++ b/include/grpc++/impl/codegen/rpc_method.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,46 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_RPC_METHOD_H
 #define GRPCXX_IMPL_CODEGEN_RPC_METHOD_H
 
-#include <memory>
-
-#include <grpc++/impl/codegen/channel_interface.h>
-
-namespace grpc {
-namespace internal {
-/// Descriptor of an RPC method
-class RpcMethod {
- public:
-  enum RpcType {
-    NORMAL_RPC = 0,
-    CLIENT_STREAMING,  // request streaming
-    SERVER_STREAMING,  // response streaming
-    BIDI_STREAMING
-  };
-
-  RpcMethod(const char* name, RpcType type)
-      : name_(name), method_type_(type), channel_tag_(NULL) {}
-
-  RpcMethod(const char* name, RpcType type,
-            const std::shared_ptr<ChannelInterface>& channel)
-      : name_(name),
-        method_type_(type),
-        channel_tag_(channel->RegisterMethod(name)) {}
-
-  const char* name() const { return name_; }
-  RpcType method_type() const { return method_type_; }
-  void SetMethodType(RpcType type) { method_type_ = type; }
-  void* channel_tag() const { return channel_tag_; }
-
- private:
-  const char* const name_;
-  RpcType method_type_;
-  void* const channel_tag_;
-};
-
-}  // namespace internal
-}  // namespace grpc
+#include <grpcpp/impl/codegen/rpc_method.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_RPC_METHOD_H
diff --git a/include/grpc++/impl/codegen/rpc_service_method.h b/include/grpc++/impl/codegen/rpc_service_method.h
index 5ba11e8559..999c0d5e93 100644
--- a/include/grpc++/impl/codegen/rpc_service_method.h
+++ b/include/grpc++/impl/codegen/rpc_service_method.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,63 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_RPC_SERVICE_METHOD_H
 #define GRPCXX_IMPL_CODEGEN_RPC_SERVICE_METHOD_H
 
-#include <climits>
-#include <functional>
-#include <map>
-#include <memory>
-#include <vector>
-
-#include <grpc++/impl/codegen/byte_buffer.h>
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/rpc_method.h>
-#include <grpc++/impl/codegen/status.h>
-
-namespace grpc {
-class ServerContext;
-
-namespace internal {
-/// Base class for running an RPC handler.
-class MethodHandler {
- public:
-  virtual ~MethodHandler() {}
-  struct HandlerParameter {
-    HandlerParameter(Call* c, ServerContext* context, grpc_byte_buffer* req)
-        : call(c), server_context(context) {
-      request.set_buffer(req);
-    }
-    ~HandlerParameter() { request.Release(); }
-    Call* call;
-    ServerContext* server_context;
-    // Handler required to destroy these contents
-    ByteBuffer request;
-  };
-  virtual void RunHandler(const HandlerParameter& param) = 0;
-};
-
-/// Server side rpc method class
-class RpcServiceMethod : public RpcMethod {
- public:
-  /// Takes ownership of the handler
-  RpcServiceMethod(const char* name, RpcMethod::RpcType type,
-                   MethodHandler* handler)
-      : RpcMethod(name, type), server_tag_(nullptr), handler_(handler) {}
-
-  void set_server_tag(void* tag) { server_tag_ = tag; }
-  void* server_tag() const { return server_tag_; }
-  /// if MethodHandler is nullptr, then this is an async method
-  MethodHandler* handler() const { return handler_.get(); }
-  void ResetHandler() { handler_.reset(); }
-  void SetHandler(MethodHandler* handler) { handler_.reset(handler); }
-
- private:
-  void* server_tag_;
-  std::unique_ptr<MethodHandler> handler_;
-};
-}  // namespace internal
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/rpc_service_method.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_RPC_SERVICE_METHOD_H
diff --git a/include/grpc++/impl/codegen/security/auth_context.h b/include/grpc++/impl/codegen/security/auth_context.h
index 337da91347..b4663739a6 100644
--- a/include/grpc++/impl/codegen/security/auth_context.h
+++ b/include/grpc++/impl/codegen/security/auth_context.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,80 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_SECURITY_AUTH_CONTEXT_H
 #define GRPCXX_IMPL_CODEGEN_SECURITY_AUTH_CONTEXT_H
 
-#include <iterator>
-#include <vector>
-
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/string_ref.h>
-
-struct grpc_auth_context;
-struct grpc_auth_property;
-struct grpc_auth_property_iterator;
-
-namespace grpc {
-class SecureAuthContext;
-
-typedef std::pair<grpc::string_ref, grpc::string_ref> AuthProperty;
-
-class AuthPropertyIterator
-    : public std::iterator<std::input_iterator_tag, const AuthProperty> {
- public:
-  ~AuthPropertyIterator();
-  AuthPropertyIterator& operator++();
-  AuthPropertyIterator operator++(int);
-  bool operator==(const AuthPropertyIterator& rhs) const;
-  bool operator!=(const AuthPropertyIterator& rhs) const;
-  const AuthProperty operator*();
-
- protected:
-  AuthPropertyIterator();
-  AuthPropertyIterator(const grpc_auth_property* property,
-                       const grpc_auth_property_iterator* iter);
-
- private:
-  friend class SecureAuthContext;
-  const grpc_auth_property* property_;
-  // The following items form a grpc_auth_property_iterator.
-  const grpc_auth_context* ctx_;
-  size_t index_;
-  const char* name_;
-};
-
-/// Class encapsulating the Authentication Information.
-///
-/// It includes the secure identity of the peer, the type of secure transport
-/// used as well as any other properties required by the authorization layer.
-class AuthContext {
- public:
-  virtual ~AuthContext() {}
-
-  /// Returns true if the peer is authenticated.
-  virtual bool IsPeerAuthenticated() const = 0;
-
-  /// A peer identity.
-  ///
-  /// It is, in general, comprised of one or more properties (in which case they
-  /// have the same name).
-  virtual std::vector<grpc::string_ref> GetPeerIdentity() const = 0;
-  virtual grpc::string GetPeerIdentityPropertyName() const = 0;
-
-  /// Returns all the property values with the given name.
-  virtual std::vector<grpc::string_ref> FindPropertyValues(
-      const grpc::string& name) const = 0;
-
-  /// Iteration over all the properties.
-  virtual AuthPropertyIterator begin() const = 0;
-  virtual AuthPropertyIterator end() const = 0;
-
-  /// Mutation functions: should only be used by an AuthMetadataProcessor.
-  virtual void AddProperty(const grpc::string& key,
-                           const grpc::string_ref& value) = 0;
-  virtual bool SetPeerIdentityPropertyName(const grpc::string& name) = 0;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/security/auth_context.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_SECURITY_AUTH_CONTEXT_H
diff --git a/include/grpc++/impl/codegen/serialization_traits.h b/include/grpc++/impl/codegen/serialization_traits.h
index 4d91739cc4..480575d109 100644
--- a/include/grpc++/impl/codegen/serialization_traits.h
+++ b/include/grpc++/impl/codegen/serialization_traits.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,47 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_SERIALIZATION_TRAITS_H
 #define GRPCXX_IMPL_CODEGEN_SERIALIZATION_TRAITS_H
 
-namespace grpc {
-
-/// Defines how to serialize and deserialize some type.
-///
-/// Used for hooking different message serialization API's into GRPC.
-/// Each SerializationTraits<Message> implementation must provide the
-/// following functions:
-/// 1.  static Status Serialize(const Message& msg,
-///                             ByteBuffer* buffer,
-///                             bool* own_buffer);
-///     OR
-///     static Status Serialize(const Message& msg,
-///                             grpc_byte_buffer** buffer,
-///                             bool* own_buffer);
-///     The former is preferred; the latter is deprecated
-///
-/// 2.  static Status Deserialize(ByteBuffer* buffer,
-///                               Message* msg);
-///     OR
-///     static Status Deserialize(grpc_byte_buffer* buffer,
-///                               Message* msg);
-///     The former is preferred; the latter is deprecated
-///
-/// Serialize is required to convert message to a ByteBuffer, and
-/// return that byte buffer through *buffer. *own_buffer should
-/// be set to true if the caller owns said byte buffer, or false if
-/// ownership is retained elsewhere.
-///
-/// Deserialize is required to convert buffer into the message stored at
-/// msg. max_receive_message_size is passed in as a bound on the maximum
-/// number of message bytes Deserialize should accept.
-///
-/// Both functions return a Status, allowing them to explain what went
-/// wrong if required.
-template <class Message,
-          class UnusedButHereForPartialTemplateSpecialization = void>
-class SerializationTraits;
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/serialization_traits.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_SERIALIZATION_TRAITS_H
diff --git a/include/grpc++/impl/codegen/server_context.h b/include/grpc++/impl/codegen/server_context.h
index 57347f4fcd..1c3342d5d4 100644
--- a/include/grpc++/impl/codegen/server_context.h
+++ b/include/grpc++/impl/codegen/server_context.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,294 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_SERVER_CONTEXT_H
 #define GRPCXX_IMPL_CODEGEN_SERVER_CONTEXT_H
 
-#include <map>
-#include <memory>
-#include <vector>
-
-#include <grpc/impl/codegen/compression_types.h>
-
-#include <grpc++/impl/codegen/call.h>
-#include <grpc++/impl/codegen/completion_queue_tag.h>
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/create_auth_context.h>
-#include <grpc++/impl/codegen/metadata_map.h>
-#include <grpc++/impl/codegen/security/auth_context.h>
-#include <grpc++/impl/codegen/string_ref.h>
-#include <grpc++/impl/codegen/time.h>
-
-struct grpc_metadata;
-struct grpc_call;
-struct census_context;
-
-namespace grpc {
-class ClientContext;
-template <class W, class R>
-class ServerAsyncReader;
-template <class W>
-class ServerAsyncWriter;
-template <class W>
-class ServerAsyncResponseWriter;
-template <class W, class R>
-class ServerAsyncReaderWriter;
-template <class R>
-class ServerReader;
-template <class W>
-class ServerWriter;
-namespace internal {
-template <class W, class R>
-class ServerReaderWriterBody;
-template <class ServiceType, class RequestType, class ResponseType>
-class RpcMethodHandler;
-template <class ServiceType, class RequestType, class ResponseType>
-class ClientStreamingHandler;
-template <class ServiceType, class RequestType, class ResponseType>
-class ServerStreamingHandler;
-template <class ServiceType, class RequestType, class ResponseType>
-class BidiStreamingHandler;
-class UnknownMethodHandler;
-template <class Streamer, bool WriteNeeded>
-class TemplatedBidiStreamingHandler;
-class Call;
-}  // namespace internal
-
-class CompletionQueue;
-class Server;
-class ServerInterface;
-
-namespace testing {
-class InteropServerContextInspector;
-class ServerContextTestSpouse;
-}  // namespace testing
-
-/// A ServerContext allows the person implementing a service handler to:
-///
-/// - Add custom initial and trailing metadata key-value pairs that will
-///   propagated to the client side.
-/// - Control call settings such as compression and authentication.
-/// - Access metadata coming from the client.
-/// - Get performance metrics (ie, census).
-///
-/// Context settings are only relevant to the call handler they are supplied to,
-/// that is to say, they aren't sticky across multiple calls. Some of these
-/// settings, such as the compression options, can be made persistant at server
-/// construction time by specifying the approriate \a ChannelArguments
-/// to a \a grpc::ServerBuilder, via \a ServerBuilder::AddChannelArgument.
-///
-/// \warning ServerContext instances should \em not be reused across rpcs.
-class ServerContext {
- public:
-  ServerContext();  // for async calls
-  ~ServerContext();
-
-  /// Return the deadline for the server call.
-  std::chrono::system_clock::time_point deadline() const {
-    return Timespec2Timepoint(deadline_);
-  }
-
-  /// Return a \a gpr_timespec representation of the server call's deadline.
-  gpr_timespec raw_deadline() const { return deadline_; }
-
-  /// Add the (\a meta_key, \a meta_value) pair to the initial metadata
-  /// associated with a server call. These are made available at the client side
-  /// by the \a grpc::ClientContext::GetServerInitialMetadata() method.
-  ///
-  /// \warning This method should only be called before sending initial metadata
-  /// to the client (which can happen explicitly, or implicitly when sending a
-  /// a response message or status to the client).
-  ///
-  /// \param meta_key The metadata key. If \a meta_value is binary data, it must
-  /// end in "-bin".
-  /// \param meta_value The metadata value. If its value is binary, the key name
-  /// must end in "-bin".
-  void AddInitialMetadata(const grpc::string& key, const grpc::string& value);
-
-  /// Add the (\a meta_key, \a meta_value) pair to the initial metadata
-  /// associated with a server call. These are made available at the client
-  /// side by the \a grpc::ClientContext::GetServerTrailingMetadata() method.
-  ///
-  /// \warning This method should only be called before sending trailing
-  /// metadata to the client (which happens when the call is finished and a
-  /// status is sent to the client).
-  ///
-  /// \param meta_key The metadata key. If \a meta_value is binary data,
-  /// it must end in "-bin".
-  /// \param meta_value The metadata value. If its value is binary, the key name
-  /// must end in "-bin".
-  void AddTrailingMetadata(const grpc::string& key, const grpc::string& value);
-
-  /// IsCancelled is always safe to call when using sync API.
-  /// When using async API, it is only safe to call IsCancelled after
-  /// the AsyncNotifyWhenDone tag has been delivered.
-  bool IsCancelled() const;
-
-  /// Cancel the Call from the server. This is a best-effort API and
-  /// depending on when it is called, the RPC may still appear successful to
-  /// the client.
-  /// For example, if TryCancel() is called on a separate thread, it might race
-  /// with the server handler which might return success to the client before
-  /// TryCancel() was even started by the thread.
-  ///
-  /// It is the caller's responsibility to prevent such races and ensure that if
-  /// TryCancel() is called, the serverhandler must return Status::CANCELLED.
-  /// The only exception is that if the serverhandler is already returning an
-  /// error status code, it is ok to not return Status::CANCELLED even if
-  /// TryCancel() was called.
-  ///
-  /// Note that TryCancel() does not change any of the tags that are pending
-  /// on the completion queue. All pending tags will still be delivered
-  /// (though their ok result may reflect the effect of cancellation).
-  void TryCancel() const;
-
-  /// Return a collection of initial metadata key-value pairs sent from the
-  /// client. Note that keys may happen more than
-  /// once (ie, a \a std::multimap is returned).
-  ///
-  /// It is safe to use this method after initial metadata has been received,
-  /// Calls always begin with the client sending initial metadata, so this is
-  /// safe to access as soon as the call has begun on the server side.
-  ///
-  /// \return A multimap of initial metadata key-value pairs from the server.
-  const std::multimap<grpc::string_ref, grpc::string_ref>& client_metadata()
-      const {
-    return *client_metadata_.map();
-  }
-
-  /// Return the compression algorithm to be used by the server call.
-  grpc_compression_level compression_level() const {
-    return compression_level_;
-  }
-
-  /// Set \a algorithm to be the compression algorithm used for the server call.
-  ///
-  /// \param algorithm The compression algorithm used for the server call.
-  void set_compression_level(grpc_compression_level level) {
-    compression_level_set_ = true;
-    compression_level_ = level;
-  }
-
-  /// Return a bool indicating whether the compression level for this call
-  /// has been set (either implicitly or through a previous call to
-  /// \a set_compression_level.
-  bool compression_level_set() const { return compression_level_set_; }
-
-  /// Return the compression algorithm the server call will request be used.
-  /// Note that the gRPC runtime may decide to ignore this request, for example,
-  /// due to resource constraints, or if the server is aware the client doesn't
-  /// support the requested algorithm.
-  grpc_compression_algorithm compression_algorithm() const {
-    return compression_algorithm_;
-  }
-  /// Set \a algorithm to be the compression algorithm used for the server call.
-  ///
-  /// \param algorithm The compression algorithm used for the server call.
-  void set_compression_algorithm(grpc_compression_algorithm algorithm);
-
-  /// Set the load reporting costs in \a cost_data for the call.
-  void SetLoadReportingCosts(const std::vector<grpc::string>& cost_data);
-
-  /// Return the authentication context for this server call.
-  ///
-  /// \see grpc::AuthContext.
-  std::shared_ptr<const AuthContext> auth_context() const {
-    if (auth_context_.get() == nullptr) {
-      auth_context_ = CreateAuthContext(call_);
-    }
-    return auth_context_;
-  }
-
-  /// Return the peer uri in a string.
-  /// WARNING: this value is never authenticated or subject to any security
-  /// related code. It must not be used for any authentication related
-  /// functionality. Instead, use auth_context.
-  grpc::string peer() const;
-
-  /// Get the census context associated with this server call.
-  const struct census_context* census_context() const;
-
-  /// Async only. Has to be called before the rpc starts.
-  /// Returns the tag in completion queue when the rpc finishes.
-  /// IsCancelled() can then be called to check whether the rpc was cancelled.
-  void AsyncNotifyWhenDone(void* tag) {
-    has_notify_when_done_tag_ = true;
-    async_notify_when_done_tag_ = tag;
-  }
-
-  /// Should be used for framework-level extensions only.
-  /// Applications never need to call this method.
-  grpc_call* c_call() { return call_; }
-
- private:
-  friend class ::grpc::testing::InteropServerContextInspector;
-  friend class ::grpc::testing::ServerContextTestSpouse;
-  friend class ::grpc::ServerInterface;
-  friend class ::grpc::Server;
-  template <class W, class R>
-  friend class ::grpc::ServerAsyncReader;
-  template <class W>
-  friend class ::grpc::ServerAsyncWriter;
-  template <class W>
-  friend class ::grpc::ServerAsyncResponseWriter;
-  template <class W, class R>
-  friend class ::grpc::ServerAsyncReaderWriter;
-  template <class R>
-  friend class ::grpc::ServerReader;
-  template <class W>
-  friend class ::grpc::ServerWriter;
-  template <class W, class R>
-  friend class ::grpc::internal::ServerReaderWriterBody;
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class ::grpc::internal::RpcMethodHandler;
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class ::grpc::internal::ClientStreamingHandler;
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class ::grpc::internal::ServerStreamingHandler;
-  template <class Streamer, bool WriteNeeded>
-  friend class ::grpc::internal::TemplatedBidiStreamingHandler;
-  friend class ::grpc::internal::UnknownMethodHandler;
-  friend class ::grpc::ClientContext;
-
-  /// Prevent copying.
-  ServerContext(const ServerContext&);
-  ServerContext& operator=(const ServerContext&);
-
-  class CompletionOp;
-
-  void BeginCompletionOp(internal::Call* call);
-  /// Return the tag queued by BeginCompletionOp()
-  internal::CompletionQueueTag* GetCompletionOpTag();
-
-  ServerContext(gpr_timespec deadline, grpc_metadata_array* arr);
-
-  void set_call(grpc_call* call) { call_ = call; }
-
-  uint32_t initial_metadata_flags() const { return 0; }
-
-  CompletionOp* completion_op_;
-  bool has_notify_when_done_tag_;
-  void* async_notify_when_done_tag_;
-
-  gpr_timespec deadline_;
-  grpc_call* call_;
-  CompletionQueue* cq_;
-  bool sent_initial_metadata_;
-  mutable std::shared_ptr<const AuthContext> auth_context_;
-  internal::MetadataMap client_metadata_;
-  std::multimap<grpc::string, grpc::string> initial_metadata_;
-  std::multimap<grpc::string, grpc::string> trailing_metadata_;
-
-  bool compression_level_set_;
-  grpc_compression_level compression_level_;
-  grpc_compression_algorithm compression_algorithm_;
-
-  internal::CallOpSet<internal::CallOpSendInitialMetadata,
-                      internal::CallOpSendMessage>
-      pending_ops_;
-  bool has_pending_ops_;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/server_context.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_SERVER_CONTEXT_H
diff --git a/include/grpc++/impl/codegen/server_interface.h b/include/grpc++/impl/codegen/server_interface.h
index 3bcf4c87e7..ceea44c50c 100644
--- a/include/grpc++/impl/codegen/server_interface.h
+++ b/include/grpc++/impl/codegen/server_interface.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,259 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_SERVER_INTERFACE_H
 #define GRPCXX_IMPL_CODEGEN_SERVER_INTERFACE_H
 
-#include <grpc++/impl/codegen/call_hook.h>
-#include <grpc++/impl/codegen/completion_queue_tag.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/rpc_service_method.h>
-#include <grpc/impl/codegen/grpc_types.h>
-
-namespace grpc {
-
-class AsyncGenericService;
-class Channel;
-class GenericServerContext;
-class ServerCompletionQueue;
-class ServerContext;
-class ServerCredentials;
-class Service;
-
-extern CoreCodegenInterface* g_core_codegen_interface;
-
-/// Models a gRPC server.
-///
-/// Servers are configured and started via \a grpc::ServerBuilder.
-namespace internal {
-class ServerAsyncStreamingInterface;
-}  // namespace internal
-
-class ServerInterface : public internal::CallHook {
- public:
-  virtual ~ServerInterface() {}
-
-  /// Shutdown the server, blocking until all rpc processing finishes.
-  /// Forcefully terminate pending calls after \a deadline expires.
-  ///
-  /// All completion queue associated with the server (for example, for async
-  /// serving) must be shutdown *after* this method has returned:
-  /// See \a ServerBuilder::AddCompletionQueue for details.
-  ///
-  /// \param deadline How long to wait until pending rpcs are forcefully
-  /// terminated.
-  template <class T>
-  void Shutdown(const T& deadline) {
-    ShutdownInternal(TimePoint<T>(deadline).raw_time());
-  }
-
-  /// Shutdown the server, waiting for all rpc processing to finish.
-  ///
-  /// All completion queue associated with the server (for example, for async
-  /// serving) must be shutdown *after* this method has returned:
-  /// See \a ServerBuilder::AddCompletionQueue for details.
-  void Shutdown() {
-    ShutdownInternal(
-        g_core_codegen_interface->gpr_inf_future(GPR_CLOCK_MONOTONIC));
-  }
-
-  /// Block waiting for all work to complete.
-  ///
-  /// \warning The server must be either shutting down or some other thread must
-  /// call \a Shutdown for this function to ever return.
-  virtual void Wait() = 0;
-
- protected:
-  friend class ::grpc::Service;
-
-  /// Register a service. This call does not take ownership of the service.
-  /// The service must exist for the lifetime of the Server instance.
-  virtual bool RegisterService(const grpc::string* host, Service* service) = 0;
-
-  /// Register a generic service. This call does not take ownership of the
-  /// service. The service must exist for the lifetime of the Server instance.
-  virtual void RegisterAsyncGenericService(AsyncGenericService* service) = 0;
-
-  /// Tries to bind \a server to the given \a addr.
-  ///
-  /// It can be invoked multiple times.
-  ///
-  /// \param addr The address to try to bind to the server (eg, localhost:1234,
-  /// 192.168.1.1:31416, [::1]:27182, etc.).
-  /// \params creds The credentials associated with the server.
-  ///
-  /// \return bound port number on sucess, 0 on failure.
-  ///
-  /// \warning It's an error to call this method on an already started server.
-  virtual int AddListeningPort(const grpc::string& addr,
-                               ServerCredentials* creds) = 0;
-
-  /// Start the server.
-  ///
-  /// \param cqs Completion queues for handling asynchronous services. The
-  /// caller is required to keep all completion queues live until the server is
-  /// destroyed.
-  /// \param num_cqs How many completion queues does \a cqs hold.
-  virtual void Start(ServerCompletionQueue** cqs, size_t num_cqs) = 0;
-
-  virtual void ShutdownInternal(gpr_timespec deadline) = 0;
-
-  virtual int max_receive_message_size() const = 0;
-
-  virtual grpc_server* server() = 0;
-
-  virtual void PerformOpsOnCall(internal::CallOpSetInterface* ops,
-                                internal::Call* call) = 0;
-
-  class BaseAsyncRequest : public internal::CompletionQueueTag {
-   public:
-    BaseAsyncRequest(ServerInterface* server, ServerContext* context,
-                     internal::ServerAsyncStreamingInterface* stream,
-                     CompletionQueue* call_cq, void* tag,
-                     bool delete_on_finalize);
-    virtual ~BaseAsyncRequest();
-
-    bool FinalizeResult(void** tag, bool* status) override;
-
-   protected:
-    ServerInterface* const server_;
-    ServerContext* const context_;
-    internal::ServerAsyncStreamingInterface* const stream_;
-    CompletionQueue* const call_cq_;
-    void* const tag_;
-    const bool delete_on_finalize_;
-    grpc_call* call_;
-  };
-
-  class RegisteredAsyncRequest : public BaseAsyncRequest {
-   public:
-    RegisteredAsyncRequest(ServerInterface* server, ServerContext* context,
-                           internal::ServerAsyncStreamingInterface* stream,
-                           CompletionQueue* call_cq, void* tag);
-
-    // uses BaseAsyncRequest::FinalizeResult
-
-   protected:
-    void IssueRequest(void* registered_method, grpc_byte_buffer** payload,
-                      ServerCompletionQueue* notification_cq);
-  };
-
-  class NoPayloadAsyncRequest final : public RegisteredAsyncRequest {
-   public:
-    NoPayloadAsyncRequest(void* registered_method, ServerInterface* server,
-                          ServerContext* context,
-                          internal::ServerAsyncStreamingInterface* stream,
-                          CompletionQueue* call_cq,
-                          ServerCompletionQueue* notification_cq, void* tag)
-        : RegisteredAsyncRequest(server, context, stream, call_cq, tag) {
-      IssueRequest(registered_method, nullptr, notification_cq);
-    }
-
-    // uses RegisteredAsyncRequest::FinalizeResult
-  };
-
-  template <class Message>
-  class PayloadAsyncRequest final : public RegisteredAsyncRequest {
-   public:
-    PayloadAsyncRequest(void* registered_method, ServerInterface* server,
-                        ServerContext* context,
-                        internal::ServerAsyncStreamingInterface* stream,
-                        CompletionQueue* call_cq,
-                        ServerCompletionQueue* notification_cq, void* tag,
-                        Message* request)
-        : RegisteredAsyncRequest(server, context, stream, call_cq, tag),
-          registered_method_(registered_method),
-          server_(server),
-          context_(context),
-          stream_(stream),
-          call_cq_(call_cq),
-          notification_cq_(notification_cq),
-          tag_(tag),
-          request_(request) {
-      IssueRequest(registered_method, &payload_, notification_cq);
-    }
-
-    bool FinalizeResult(void** tag, bool* status) override {
-      if (*status) {
-        if (payload_ == nullptr ||
-            !SerializationTraits<Message>::Deserialize(payload_, request_)
-                 .ok()) {
-          // If deserialization fails, we cancel the call and instantiate
-          // a new instance of ourselves to request another call.  We then
-          // return false, which prevents the call from being returned to
-          // the application.
-          g_core_codegen_interface->grpc_call_cancel_with_status(
-              call_, GRPC_STATUS_INTERNAL, "Unable to parse request", nullptr);
-          g_core_codegen_interface->grpc_call_unref(call_);
-          new PayloadAsyncRequest(registered_method_, server_, context_,
-                                  stream_, call_cq_, notification_cq_, tag_,
-                                  request_);
-          delete this;
-          return false;
-        }
-      }
-      return RegisteredAsyncRequest::FinalizeResult(tag, status);
-    }
-
-   private:
-    void* const registered_method_;
-    ServerInterface* const server_;
-    ServerContext* const context_;
-    internal::ServerAsyncStreamingInterface* const stream_;
-    CompletionQueue* const call_cq_;
-    ServerCompletionQueue* const notification_cq_;
-    void* const tag_;
-    Message* const request_;
-    grpc_byte_buffer* payload_;
-  };
-
-  class GenericAsyncRequest : public BaseAsyncRequest {
-   public:
-    GenericAsyncRequest(ServerInterface* server, GenericServerContext* context,
-                        internal::ServerAsyncStreamingInterface* stream,
-                        CompletionQueue* call_cq,
-                        ServerCompletionQueue* notification_cq, void* tag,
-                        bool delete_on_finalize);
-
-    bool FinalizeResult(void** tag, bool* status) override;
-
-   private:
-    grpc_call_details call_details_;
-  };
-
-  template <class Message>
-  void RequestAsyncCall(internal::RpcServiceMethod* method,
-                        ServerContext* context,
-                        internal::ServerAsyncStreamingInterface* stream,
-                        CompletionQueue* call_cq,
-                        ServerCompletionQueue* notification_cq, void* tag,
-                        Message* message) {
-    GPR_CODEGEN_ASSERT(method);
-    new PayloadAsyncRequest<Message>(method->server_tag(), this, context,
-                                     stream, call_cq, notification_cq, tag,
-                                     message);
-  }
-
-  void RequestAsyncCall(internal::RpcServiceMethod* method,
-                        ServerContext* context,
-                        internal::ServerAsyncStreamingInterface* stream,
-                        CompletionQueue* call_cq,
-                        ServerCompletionQueue* notification_cq, void* tag) {
-    GPR_CODEGEN_ASSERT(method);
-    new NoPayloadAsyncRequest(method->server_tag(), this, context, stream,
-                              call_cq, notification_cq, tag);
-  }
-
-  void RequestAsyncGenericCall(GenericServerContext* context,
-                               internal::ServerAsyncStreamingInterface* stream,
-                               CompletionQueue* call_cq,
-                               ServerCompletionQueue* notification_cq,
-                               void* tag) {
-    new GenericAsyncRequest(this, context, stream, call_cq, notification_cq,
-                            tag, true);
-  }
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/server_interface.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_SERVER_INTERFACE_H
diff --git a/include/grpc++/impl/codegen/service_type.h b/include/grpc++/impl/codegen/service_type.h
index 71c3d99d5c..be02b75bae 100644
--- a/include/grpc++/impl/codegen/service_type.h
+++ b/include/grpc++/impl/codegen/service_type.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,148 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_SERVICE_TYPE_H
 #define GRPCXX_IMPL_CODEGEN_SERVICE_TYPE_H
 
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/rpc_service_method.h>
-#include <grpc++/impl/codegen/serialization_traits.h>
-#include <grpc++/impl/codegen/server_interface.h>
-#include <grpc++/impl/codegen/status.h>
-
-namespace grpc {
-
-class CompletionQueue;
-class Server;
-class ServerInterface;
-class ServerCompletionQueue;
-class ServerContext;
-
-namespace internal {
-class Call;
-class ServerAsyncStreamingInterface {
- public:
-  virtual ~ServerAsyncStreamingInterface() {}
-
-  /// Request notification of the sending of initial metadata to the client.
-  /// Completion will be notified by \a tag on the associated completion
-  /// queue. This call is optional, but if it is used, it cannot be used
-  /// concurrently with or after the \a Finish method.
-  ///
-  /// \param[in] tag Tag identifying this request.
-  virtual void SendInitialMetadata(void* tag) = 0;
-
- private:
-  friend class ::grpc::ServerInterface;
-  virtual void BindCall(Call* call) = 0;
-};
-}  // namespace internal
-
-/// Desriptor of an RPC service and its various RPC methods
-class Service {
- public:
-  Service() : server_(nullptr) {}
-  virtual ~Service() {}
-
-  bool has_async_methods() const {
-    for (auto it = methods_.begin(); it != methods_.end(); ++it) {
-      if (*it && (*it)->handler() == nullptr) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  bool has_synchronous_methods() const {
-    for (auto it = methods_.begin(); it != methods_.end(); ++it) {
-      if (*it && (*it)->handler() != nullptr) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  bool has_generic_methods() const {
-    for (auto it = methods_.begin(); it != methods_.end(); ++it) {
-      if (it->get() == nullptr) {
-        return true;
-      }
-    }
-    return false;
-  }
-
- protected:
-  template <class Message>
-  void RequestAsyncUnary(int index, ServerContext* context, Message* request,
-                         internal::ServerAsyncStreamingInterface* stream,
-                         CompletionQueue* call_cq,
-                         ServerCompletionQueue* notification_cq, void* tag) {
-    server_->RequestAsyncCall(methods_[index].get(), context, stream, call_cq,
-                              notification_cq, tag, request);
-  }
-  void RequestAsyncClientStreaming(
-      int index, ServerContext* context,
-      internal::ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq,
-      ServerCompletionQueue* notification_cq, void* tag) {
-    server_->RequestAsyncCall(methods_[index].get(), context, stream, call_cq,
-                              notification_cq, tag);
-  }
-  template <class Message>
-  void RequestAsyncServerStreaming(
-      int index, ServerContext* context, Message* request,
-      internal::ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq,
-      ServerCompletionQueue* notification_cq, void* tag) {
-    server_->RequestAsyncCall(methods_[index].get(), context, stream, call_cq,
-                              notification_cq, tag, request);
-  }
-  void RequestAsyncBidiStreaming(
-      int index, ServerContext* context,
-      internal::ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq,
-      ServerCompletionQueue* notification_cq, void* tag) {
-    server_->RequestAsyncCall(methods_[index].get(), context, stream, call_cq,
-                              notification_cq, tag);
-  }
-
-  void AddMethod(internal::RpcServiceMethod* method) {
-    methods_.emplace_back(method);
-  }
-
-  void MarkMethodAsync(int index) {
-    GPR_CODEGEN_ASSERT(
-        methods_[index].get() != nullptr &&
-        "Cannot mark the method as 'async' because it has already been "
-        "marked as 'generic'.");
-    methods_[index]->ResetHandler();
-  }
-
-  void MarkMethodGeneric(int index) {
-    GPR_CODEGEN_ASSERT(
-        methods_[index]->handler() != nullptr &&
-        "Cannot mark the method as 'generic' because it has already been "
-        "marked as 'async'.");
-    methods_[index].reset();
-  }
-
-  void MarkMethodStreamed(int index, internal::MethodHandler* streamed_method) {
-    GPR_CODEGEN_ASSERT(methods_[index] && methods_[index]->handler() &&
-                       "Cannot mark an async or generic method Streamed");
-    methods_[index]->SetHandler(streamed_method);
-
-    // From the server's point of view, streamed unary is a special
-    // case of BIDI_STREAMING that has 1 read and 1 write, in that order,
-    // and split server-side streaming is BIDI_STREAMING with 1 read and
-    // any number of writes, in that order.
-    methods_[index]->SetMethodType(internal::RpcMethod::BIDI_STREAMING);
-  }
-
- private:
-  friend class Server;
-  friend class ServerInterface;
-  ServerInterface* server_;
-  std::vector<std::unique_ptr<internal::RpcServiceMethod>> methods_;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/service_type.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_SERVICE_TYPE_H
diff --git a/include/grpc++/impl/codegen/slice.h b/include/grpc++/impl/codegen/slice.h
index c185bf4fd0..6714badc37 100644
--- a/include/grpc++/impl/codegen/slice.h
+++ b/include/grpc++/impl/codegen/slice.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,113 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_SLICE_H
 #define GRPCXX_IMPL_CODEGEN_SLICE_H
 
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/string_ref.h>
-
-#include <grpc/impl/codegen/slice.h>
-
-namespace grpc {
-
-/// A wrapper around \a grpc_slice.
-///
-/// A slice represents a contiguous reference counted array of bytes.
-/// It is cheap to take references to a slice, and it is cheap to create a
-/// slice pointing to a subset of another slice.
-class Slice final {
- public:
-  /// Construct an empty slice.
-  Slice();
-  /// Destructor - drops one reference.
-  ~Slice();
-
-  enum AddRef { ADD_REF };
-  /// Construct a slice from \a slice, adding a reference.
-  Slice(grpc_slice slice, AddRef);
-
-  enum StealRef { STEAL_REF };
-  /// Construct a slice from \a slice, stealing a reference.
-  Slice(grpc_slice slice, StealRef);
-
-  /// Allocate a slice of specified size
-  Slice(size_t len);
-
-  /// Construct a slice from a copied buffer
-  Slice(const void* buf, size_t len);
-
-  /// Construct a slice from a copied string
-  Slice(const grpc::string& str);
-
-  enum StaticSlice { STATIC_SLICE };
-
-  /// Construct a slice from a static buffer
-  Slice(const void* buf, size_t len, StaticSlice);
-
-  /// Copy constructor, adds a reference.
-  Slice(const Slice& other);
-
-  /// Assignment, reference count is unchanged.
-  Slice& operator=(Slice other) {
-    std::swap(slice_, other.slice_);
-    return *this;
-  }
-
-  /// Create a slice pointing at some data. Calls malloc to allocate a refcount
-  /// for the object, and arranges that destroy will be called with the
-  /// user data pointer passed in at destruction. Can be the same as buf or
-  /// different (e.g., if data is part of a larger structure that must be
-  /// destroyed when the data is no longer needed)
-  Slice(void* buf, size_t len, void (*destroy)(void*), void* user_data);
-
-  /// Specialization of above for common case where buf == user_data
-  Slice(void* buf, size_t len, void (*destroy)(void*))
-      : Slice(buf, len, destroy, buf) {}
-
-  /// Similar to the above but has a destroy that also takes slice length
-  Slice(void* buf, size_t len, void (*destroy)(void*, size_t));
-
-  /// Byte size.
-  size_t size() const { return GRPC_SLICE_LENGTH(slice_); }
-
-  /// Raw pointer to the beginning (first element) of the slice.
-  const uint8_t* begin() const { return GRPC_SLICE_START_PTR(slice_); }
-
-  /// Raw pointer to the end (one byte \em past the last element) of the slice.
-  const uint8_t* end() const { return GRPC_SLICE_END_PTR(slice_); }
-
-  /// Raw C slice. Caller needs to call grpc_slice_unref when done.
-  grpc_slice c_slice() const;
-
- private:
-  friend class ByteBuffer;
-
-  grpc_slice slice_;
-};
-
-inline grpc::string_ref StringRefFromSlice(const grpc_slice* slice) {
-  return grpc::string_ref(
-      reinterpret_cast<const char*>(GRPC_SLICE_START_PTR(*slice)),
-      GRPC_SLICE_LENGTH(*slice));
-}
-
-inline grpc::string StringFromCopiedSlice(grpc_slice slice) {
-  return grpc::string(reinterpret_cast<char*>(GRPC_SLICE_START_PTR(slice)),
-                      GRPC_SLICE_LENGTH(slice));
-}
-
-inline grpc_slice SliceReferencingString(const grpc::string& str) {
-  return g_core_codegen_interface->grpc_slice_from_static_buffer(str.data(),
-                                                                 str.length());
-}
-
-inline grpc_slice SliceFromCopiedString(const grpc::string& str) {
-  return g_core_codegen_interface->grpc_slice_from_copied_buffer(str.data(),
-                                                                 str.length());
-}
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/slice.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_SLICE_H
diff --git a/include/grpc++/impl/codegen/status.h b/include/grpc++/impl/codegen/status.h
index 6f013cf0ca..6cf9459fff 100644
--- a/include/grpc++/impl/codegen/status.h
+++ b/include/grpc++/impl/codegen/status.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,64 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_STATUS_H
 #define GRPCXX_IMPL_CODEGEN_STATUS_H
 
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/status_code_enum.h>
-
-namespace grpc {
-
-/// Did it work? If it didn't, why?
-///
-/// See \a grpc::StatusCode for details on the available code and their meaning.
-class Status {
- public:
-  /// Construct an OK instance.
-  Status() : code_(StatusCode::OK) {}
-
-  /// Construct an instance with associated \a code and \a error_message.
-  /// It is an error to construct an OK status with non-empty \a error_message.
-  Status(StatusCode code, const grpc::string& error_message)
-      : code_(code), error_message_(error_message) {}
-
-  /// Construct an instance with \a code,  \a error_message and
-  /// \a error_details. It is an error to construct an OK status with non-empty
-  /// \a error_message and/or \a error_details.
-  Status(StatusCode code, const grpc::string& error_message,
-         const grpc::string& error_details)
-      : code_(code),
-        error_message_(error_message),
-        binary_error_details_(error_details) {}
-
-  // Pre-defined special status objects.
-  /// An OK pre-defined instance.
-  static const Status& OK;
-  /// A CANCELLED pre-defined instance.
-  static const Status& CANCELLED;
-
-  /// Return the instance's error code.
-  StatusCode error_code() const { return code_; }
-  /// Return the instance's error message.
-  grpc::string error_message() const { return error_message_; }
-  /// Return the (binary) error details.
-  // Usually it contains a serialized google.rpc.Status proto.
-  grpc::string error_details() const { return binary_error_details_; }
-
-  /// Is the status OK?
-  bool ok() const { return code_ == StatusCode::OK; }
-
-  // Ignores any errors. This method does nothing except potentially suppress
-  // complaints from any tools that are checking that errors are not dropped on
-  // the floor.
-  void IgnoreError() const {}
-
- private:
-  StatusCode code_;
-  grpc::string error_message_;
-  grpc::string binary_error_details_;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/status.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_STATUS_H
diff --git a/include/grpc++/impl/codegen/status_code_enum.h b/include/grpc++/impl/codegen/status_code_enum.h
index 68da185c9e..7503eaeeca 100644
--- a/include/grpc++/impl/codegen/status_code_enum.h
+++ b/include/grpc++/impl/codegen/status_code_enum.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,127 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_STATUS_CODE_ENUM_H
 #define GRPCXX_IMPL_CODEGEN_STATUS_CODE_ENUM_H
 
-namespace grpc {
-
-enum StatusCode {
-  /// Not an error; returned on success.
-  OK = 0,
-
-  /// The operation was cancelled (typically by the caller).
-  CANCELLED = 1,
-
-  /// Unknown error. An example of where this error may be returned is if a
-  /// Status value received from another address space belongs to an error-space
-  /// that is not known in this address space. Also errors raised by APIs that
-  /// do not return enough error information may be converted to this error.
-  UNKNOWN = 2,
-
-  /// Client specified an invalid argument. Note that this differs from
-  /// FAILED_PRECONDITION. INVALID_ARGUMENT indicates arguments that are
-  /// problematic regardless of the state of the system (e.g., a malformed file
-  /// name).
-  INVALID_ARGUMENT = 3,
-
-  /// Deadline expired before operation could complete. For operations that
-  /// change the state of the system, this error may be returned even if the
-  /// operation has completed successfully. For example, a successful response
-  /// from a server could have been delayed long enough for the deadline to
-  /// expire.
-  DEADLINE_EXCEEDED = 4,
-
-  /// Some requested entity (e.g., file or directory) was not found.
-  NOT_FOUND = 5,
-
-  /// Some entity that we attempted to create (e.g., file or directory) already
-  /// exists.
-  ALREADY_EXISTS = 6,
-
-  /// The caller does not have permission to execute the specified operation.
-  /// PERMISSION_DENIED must not be used for rejections caused by exhausting
-  /// some resource (use RESOURCE_EXHAUSTED instead for those errors).
-  /// PERMISSION_DENIED must not be used if the caller can not be identified
-  /// (use UNAUTHENTICATED instead for those errors).
-  PERMISSION_DENIED = 7,
-
-  /// The request does not have valid authentication credentials for the
-  /// operation.
-  UNAUTHENTICATED = 16,
-
-  /// Some resource has been exhausted, perhaps a per-user quota, or perhaps the
-  /// entire file system is out of space.
-  RESOURCE_EXHAUSTED = 8,
-
-  /// Operation was rejected because the system is not in a state required for
-  /// the operation's execution. For example, directory to be deleted may be
-  /// non-empty, an rmdir operation is applied to a non-directory, etc.
-  ///
-  /// A litmus test that may help a service implementor in deciding
-  /// between FAILED_PRECONDITION, ABORTED, and UNAVAILABLE:
-  ///  (a) Use UNAVAILABLE if the client can retry just the failing call.
-  ///  (b) Use ABORTED if the client should retry at a higher-level
-  ///      (e.g., restarting a read-modify-write sequence).
-  ///  (c) Use FAILED_PRECONDITION if the client should not retry until
-  ///      the system state has been explicitly fixed. E.g., if an "rmdir"
-  ///      fails because the directory is non-empty, FAILED_PRECONDITION
-  ///      should be returned since the client should not retry unless
-  ///      they have first fixed up the directory by deleting files from it.
-  ///  (d) Use FAILED_PRECONDITION if the client performs conditional
-  ///      REST Get/Update/Delete on a resource and the resource on the
-  ///      server does not match the condition. E.g., conflicting
-  ///      read-modify-write on the same resource.
-  FAILED_PRECONDITION = 9,
-
-  /// The operation was aborted, typically due to a concurrency issue like
-  /// sequencer check failures, transaction aborts, etc.
-  ///
-  /// See litmus test above for deciding between FAILED_PRECONDITION, ABORTED,
-  /// and UNAVAILABLE.
-  ABORTED = 10,
-
-  /// Operation was attempted past the valid range. E.g., seeking or reading
-  /// past end of file.
-  ///
-  /// Unlike INVALID_ARGUMENT, this error indicates a problem that may be fixed
-  /// if the system state changes. For example, a 32-bit file system will
-  /// generate INVALID_ARGUMENT if asked to read at an offset that is not in the
-  /// range [0,2^32-1], but it will generate OUT_OF_RANGE if asked to read from
-  /// an offset past the current file size.
-  ///
-  /// There is a fair bit of overlap between FAILED_PRECONDITION and
-  /// OUT_OF_RANGE. We recommend using OUT_OF_RANGE (the more specific error)
-  /// when it applies so that callers who are iterating through a space can
-  /// easily look for an OUT_OF_RANGE error to detect when they are done.
-  OUT_OF_RANGE = 11,
-
-  /// Operation is not implemented or not supported/enabled in this service.
-  UNIMPLEMENTED = 12,
-
-  /// Internal errors. Means some invariants expected by underlying System has
-  /// been broken. If you see one of these errors, Something is very broken.
-  INTERNAL = 13,
-
-  /// The service is currently unavailable. This is a most likely a transient
-  /// condition and may be corrected by retrying with a backoff.
-  ///
-  /// \warning Although data MIGHT not have been transmitted when this
-  /// status occurs, there is NOT A GUARANTEE that the server has not seen
-  /// anything. So in general it is unsafe to retry on this status code
-  /// if the call is non-idempotent.
-  ///
-  /// See litmus test above for deciding between FAILED_PRECONDITION, ABORTED,
-  /// and UNAVAILABLE.
-  UNAVAILABLE = 14,
-
-  /// Unrecoverable data loss or corruption.
-  DATA_LOSS = 15,
-
-  /// Force users to include a default branch:
-  DO_NOT_USE = -1
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/status_code_enum.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_STATUS_CODE_ENUM_H
diff --git a/include/grpc++/impl/codegen/string_ref.h b/include/grpc++/impl/codegen/string_ref.h
index dbe3f197a9..66e250efdd 100644
--- a/include/grpc++/impl/codegen/string_ref.h
+++ b/include/grpc++/impl/codegen/string_ref.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,131 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_STRING_REF_H
 #define GRPCXX_IMPL_CODEGEN_STRING_REF_H
 
-#include <string.h>
-
-#include <algorithm>
-#include <iosfwd>
-#include <iostream>
-#include <iterator>
-
-#include <grpc++/impl/codegen/config.h>
-
-namespace grpc {
-
-/// This class is a non owning reference to a string.
-///
-/// It should be a strict subset of the upcoming std::string_ref.
-///
-/// \see http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3442.html
-///
-/// The constexpr is dropped or replaced with const for legacy compiler
-/// compatibility.
-class string_ref {
- public:
-  /// types
-  typedef const char* const_iterator;
-  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
-
-  /// constants
-  const static size_t npos;
-
-  /// construct/copy.
-  string_ref() : data_(nullptr), length_(0) {}
-  string_ref(const string_ref& other)
-      : data_(other.data_), length_(other.length_) {}
-  string_ref& operator=(const string_ref& rhs) {
-    data_ = rhs.data_;
-    length_ = rhs.length_;
-    return *this;
-  }
-
-  string_ref(const char* s) : data_(s), length_(strlen(s)) {}
-  string_ref(const char* s, size_t l) : data_(s), length_(l) {}
-  string_ref(const grpc::string& s) : data_(s.data()), length_(s.length()) {}
-
-  /// iterators
-  const_iterator begin() const { return data_; }
-  const_iterator end() const { return data_ + length_; }
-  const_iterator cbegin() const { return data_; }
-  const_iterator cend() const { return data_ + length_; }
-  const_reverse_iterator rbegin() const {
-    return const_reverse_iterator(end());
-  }
-  const_reverse_iterator rend() const {
-    return const_reverse_iterator(begin());
-  }
-  const_reverse_iterator crbegin() const {
-    return const_reverse_iterator(end());
-  }
-  const_reverse_iterator crend() const {
-    return const_reverse_iterator(begin());
-  }
-
-  /// capacity
-  size_t size() const { return length_; }
-  size_t length() const { return length_; }
-  size_t max_size() const { return length_; }
-  bool empty() const { return length_ == 0; }
-
-  /// element access
-  const char* data() const { return data_; }
-
-  /// string operations
-  int compare(string_ref x) const {
-    size_t min_size = length_ < x.length_ ? length_ : x.length_;
-    int r = memcmp(data_, x.data_, min_size);
-    if (r < 0) return -1;
-    if (r > 0) return 1;
-    if (length_ < x.length_) return -1;
-    if (length_ > x.length_) return 1;
-    return 0;
-  }
-
-  bool starts_with(string_ref x) const {
-    return length_ >= x.length_ && (memcmp(data_, x.data_, x.length_) == 0);
-  }
-
-  bool ends_with(string_ref x) const {
-    return length_ >= x.length_ &&
-           (memcmp(data_ + (length_ - x.length_), x.data_, x.length_) == 0);
-  }
-
-  size_t find(string_ref s) const {
-    auto it = std::search(cbegin(), cend(), s.cbegin(), s.cend());
-    return it == cend() ? npos : std::distance(cbegin(), it);
-  }
-
-  size_t find(char c) const {
-    auto it = std::find(cbegin(), cend(), c);
-    return it == cend() ? npos : std::distance(cbegin(), it);
-  }
-
-  string_ref substr(size_t pos, size_t n = npos) const {
-    if (pos > length_) pos = length_;
-    if (n > (length_ - pos)) n = length_ - pos;
-    return string_ref(data_ + pos, n);
-  }
-
- private:
-  const char* data_;
-  size_t length_;
-};
-
-/// Comparison operators
-inline bool operator==(string_ref x, string_ref y) { return x.compare(y) == 0; }
-inline bool operator!=(string_ref x, string_ref y) { return x.compare(y) != 0; }
-inline bool operator<(string_ref x, string_ref y) { return x.compare(y) < 0; }
-inline bool operator<=(string_ref x, string_ref y) { return x.compare(y) <= 0; }
-inline bool operator>(string_ref x, string_ref y) { return x.compare(y) > 0; }
-inline bool operator>=(string_ref x, string_ref y) { return x.compare(y) >= 0; }
-
-inline std::ostream& operator<<(std::ostream& out, const string_ref& string) {
-  return out << grpc::string(string.begin(), string.end());
-}
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/string_ref.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_STRING_REF_H
diff --git a/include/grpc++/impl/codegen/stub_options.h b/include/grpc++/impl/codegen/stub_options.h
index 380d052a6a..07cb4417b7 100644
--- a/include/grpc++/impl/codegen/stub_options.h
+++ b/include/grpc++/impl/codegen/stub_options.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,14 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_STUB_OPTIONS_H
 #define GRPCXX_IMPL_CODEGEN_STUB_OPTIONS_H
 
-namespace grpc {
-
-/// Useful interface for generated stubs
-class StubOptions {};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/stub_options.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_STUB_OPTIONS_H
diff --git a/include/grpc++/impl/codegen/sync_stream.h b/include/grpc++/impl/codegen/sync_stream.h
index a6dd26fb00..1e6ba27bf5 100644
--- a/include/grpc++/impl/codegen/sync_stream.h
+++ b/include/grpc++/impl/codegen/sync_stream.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,919 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_SYNC_STREAM_H
 #define GRPCXX_IMPL_CODEGEN_SYNC_STREAM_H
 
-#include <grpc++/impl/codegen/call.h>
-#include <grpc++/impl/codegen/channel_interface.h>
-#include <grpc++/impl/codegen/client_context.h>
-#include <grpc++/impl/codegen/completion_queue.h>
-#include <grpc++/impl/codegen/core_codegen_interface.h>
-#include <grpc++/impl/codegen/server_context.h>
-#include <grpc++/impl/codegen/service_type.h>
-#include <grpc++/impl/codegen/status.h>
-
-namespace grpc {
-
-namespace internal {
-/// Common interface for all synchronous client side streaming.
-class ClientStreamingInterface {
- public:
-  virtual ~ClientStreamingInterface() {}
-
-  /// Block waiting until the stream finishes and a final status of the call is
-  /// available.
-  ///
-  /// It is appropriate to call this method when both:
-  ///   * the calling code (client-side) has no more message to send
-  ///     (this can be declared implicitly by calling this method, or
-  ///     explicitly through an earlier call to <i>WritesDone</i> method of the
-  ///     class in use, e.g. \a ClientWriterInterface::WritesDone or
-  ///     \a ClientReaderWriterInterface::WritesDone).
-  ///   * there are no more messages to be received from the server (which can
-  ///     be known implicitly, or explicitly from an earlier call to \a
-  ///     ReaderInterface::Read that returned "false").
-  ///
-  /// This function will return either:
-  /// - when all incoming messages have been read and the server has
-  ///   returned status.
-  /// - when the server has returned a non-OK status.
-  /// - OR when the call failed for some reason and the library generated a
-  ///   status.
-  ///
-  /// Return values:
-  ///   - \a Status contains the status code, message and details for the call
-  ///   - the \a ClientContext associated with this call is updated with
-  ///     possible trailing metadata sent from the server.
-  virtual Status Finish() = 0;
-};
-
-/// Common interface for all synchronous server side streaming.
-class ServerStreamingInterface {
- public:
-  virtual ~ServerStreamingInterface() {}
-
-  /// Block to send initial metadata to client.
-  /// This call is optional, but if it is used, it cannot be used concurrently
-  /// with or after the \a Finish method.
-  ///
-  /// The initial metadata that will be sent to the client will be
-  /// taken from the \a ServerContext associated with the call.
-  virtual void SendInitialMetadata() = 0;
-};
-
-/// An interface that yields a sequence of messages of type \a R.
-template <class R>
-class ReaderInterface {
- public:
-  virtual ~ReaderInterface() {}
-
-  /// Get an upper bound on the next message size available for reading on this
-  /// stream.
-  virtual bool NextMessageSize(uint32_t* sz) = 0;
-
-  /// Block to read a message and parse to \a msg. Returns \a true on success.
-  /// This is thread-safe with respect to \a Write or \WritesDone methods on
-  /// the same stream. It should not be called concurrently with another \a
-  /// Read on the same stream as the order of delivery will not be defined.
-  ///
-  /// \param[out] msg The read message.
-  ///
-  /// \return \a false when there will be no more incoming messages, either
-  /// because the other side has called \a WritesDone() or the stream has failed
-  /// (or been cancelled).
-  virtual bool Read(R* msg) = 0;
-};
-
-/// An interface that can be fed a sequence of messages of type \a W.
-template <class W>
-class WriterInterface {
- public:
-  virtual ~WriterInterface() {}
-
-  /// Block to write \a msg to the stream with WriteOptions \a options.
-  /// This is thread-safe with respect to \a ReaderInterface::Read
-  ///
-  /// \param msg The message to be written to the stream.
-  /// \param options The WriteOptions affecting the write operation.
-  ///
-  /// \return \a true on success, \a false when the stream has been closed.
-  virtual bool Write(const W& msg, WriteOptions options) = 0;
-
-  /// Block to write \a msg to the stream with default write options.
-  /// This is thread-safe with respect to \a ReaderInterface::Read
-  ///
-  /// \param msg The message to be written to the stream.
-  ///
-  /// \return \a true on success, \a false when the stream has been closed.
-  inline bool Write(const W& msg) { return Write(msg, WriteOptions()); }
-
-  /// Write \a msg and coalesce it with the writing of trailing metadata, using
-  /// WriteOptions \a options.
-  ///
-  /// For client, WriteLast is equivalent of performing Write and WritesDone in
-  /// a single step. \a msg and trailing metadata are coalesced and sent on wire
-  /// by calling this function. For server, WriteLast buffers the \a msg.
-  /// The writing of \a msg is held until the service handler returns,
-  /// where \a msg and trailing metadata are coalesced and sent on wire.
-  /// Note that WriteLast can only buffer \a msg up to the flow control window
-  /// size. If \a msg size is larger than the window size, it will be sent on
-  /// wire without buffering.
-  ///
-  /// \param[in] msg The message to be written to the stream.
-  /// \param[in] options The WriteOptions to be used to write this message.
-  void WriteLast(const W& msg, WriteOptions options) {
-    Write(msg, options.set_last_message());
-  }
-};
-
-}  // namespace internal
-
-/// Client-side interface for streaming reads of message of type \a R.
-template <class R>
-class ClientReaderInterface : public internal::ClientStreamingInterface,
-                              public internal::ReaderInterface<R> {
- public:
-  /// Block to wait for initial metadata from server. The received metadata
-  /// can only be accessed after this call returns. Should only be called before
-  /// the first read. Calling this method is optional, and if it is not called
-  /// the metadata will be available in ClientContext after the first read.
-  virtual void WaitForInitialMetadata() = 0;
-};
-
-namespace internal {
-template <class R>
-class ClientReaderFactory {
- public:
-  template <class W>
-  static ClientReader<R>* Create(ChannelInterface* channel,
-                                 const ::grpc::internal::RpcMethod& method,
-                                 ClientContext* context, const W& request) {
-    return new ClientReader<R>(channel, method, context, request);
-  }
-};
-}  // namespace internal
-
-/// Synchronous (blocking) client-side API for doing server-streaming RPCs,
-/// where the stream of messages coming from the server has messages
-/// of type \a R.
-template <class R>
-class ClientReader final : public ClientReaderInterface<R> {
- public:
-  /// See the \a ClientStreamingInterface.WaitForInitialMetadata method for
-  /// semantics.
-  ///
-  //  Side effect:
-  ///   Once complete, the initial metadata read from
-  ///   the server will be accessable through the \a ClientContext used to
-  ///   construct this object.
-  void WaitForInitialMetadata() override {
-    GPR_CODEGEN_ASSERT(!context_->initial_metadata_received_);
-
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata>
-        ops;
-    ops.RecvInitialMetadata(context_);
-    call_.PerformOps(&ops);
-    cq_.Pluck(&ops);  /// status ignored
-  }
-
-  bool NextMessageSize(uint32_t* sz) override {
-    *sz = call_.max_receive_message_size();
-    return true;
-  }
-
-  /// See the \a ReaderInterface.Read method for semantics.
-  /// Side effect:
-  ///   This also receives initial metadata from the server, if not
-  ///   already received (if initial metadata is received, it can be then
-  ///   accessed through the \a ClientContext associated with this call).
-  bool Read(R* msg) override {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                                ::grpc::internal::CallOpRecvMessage<R>>
-        ops;
-    if (!context_->initial_metadata_received_) {
-      ops.RecvInitialMetadata(context_);
-    }
-    ops.RecvMessage(msg);
-    call_.PerformOps(&ops);
-    return cq_.Pluck(&ops) && ops.got_message;
-  }
-
-  /// See the \a ClientStreamingInterface.Finish method for semantics.
-  ///
-  /// Side effect:
-  ///   The \a ClientContext associated with this call is updated with
-  ///   possible metadata received from the server.
-  Status Finish() override {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpClientRecvStatus> ops;
-    Status status;
-    ops.ClientRecvStatus(context_, &status);
-    call_.PerformOps(&ops);
-    GPR_CODEGEN_ASSERT(cq_.Pluck(&ops));
-    return status;
-  }
-
- private:
-  friend class internal::ClientReaderFactory<R>;
-  ClientContext* context_;
-  CompletionQueue cq_;
-  ::grpc::internal::Call call_;
-
-  /// Block to create a stream and write the initial metadata and \a request
-  /// out. Note that \a context will be used to fill in custom initial
-  /// metadata used to send to the server when starting the call.
-  template <class W>
-  ClientReader(::grpc::ChannelInterface* channel,
-               const ::grpc::internal::RpcMethod& method,
-               ClientContext* context, const W& request)
-      : context_(context),
-        cq_(grpc_completion_queue_attributes{
-            GRPC_CQ_CURRENT_VERSION, GRPC_CQ_PLUCK,
-            GRPC_CQ_DEFAULT_POLLING}),  // Pluckable cq
-        call_(channel->CreateCall(method, context, &cq_)) {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                                ::grpc::internal::CallOpSendMessage,
-                                ::grpc::internal::CallOpClientSendClose>
-        ops;
-    ops.SendInitialMetadata(context->send_initial_metadata_,
-                            context->initial_metadata_flags());
-    // TODO(ctiller): don't assert
-    GPR_CODEGEN_ASSERT(ops.SendMessage(request).ok());
-    ops.ClientSendClose();
-    call_.PerformOps(&ops);
-    cq_.Pluck(&ops);
-  }
-};
-
-/// Client-side interface for streaming writes of message type \a W.
-template <class W>
-class ClientWriterInterface : public internal::ClientStreamingInterface,
-                              public internal::WriterInterface<W> {
- public:
-  /// Half close writing from the client. (signal that the stream of messages
-  /// coming from the client is complete).
-  /// Blocks until currently-pending writes are completed.
-  /// Thread safe with respect to \a ReaderInterface::Read operations only
-  ///
-  /// \return Whether the writes were successful.
-  virtual bool WritesDone() = 0;
-};
-
-namespace internal {
-template <class W>
-class ClientWriterFactory {
- public:
-  template <class R>
-  static ClientWriter<W>* Create(::grpc::ChannelInterface* channel,
-                                 const ::grpc::internal::RpcMethod& method,
-                                 ClientContext* context, R* response) {
-    return new ClientWriter<W>(channel, method, context, response);
-  }
-};
-}  // namespace internal
-
-/// Synchronous (blocking) client-side API for doing client-streaming RPCs,
-/// where the outgoing message stream coming from the client has messages of
-/// type \a W.
-template <class W>
-class ClientWriter : public ClientWriterInterface<W> {
- public:
-  /// See the \a ClientStreamingInterface.WaitForInitialMetadata method for
-  /// semantics.
-  ///
-  //  Side effect:
-  ///   Once complete, the initial metadata read from the server will be
-  ///   accessable through the \a ClientContext used to construct this object.
-  void WaitForInitialMetadata() {
-    GPR_CODEGEN_ASSERT(!context_->initial_metadata_received_);
-
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata>
-        ops;
-    ops.RecvInitialMetadata(context_);
-    call_.PerformOps(&ops);
-    cq_.Pluck(&ops);  // status ignored
-  }
-
-  /// See the WriterInterface.Write(const W& msg, WriteOptions options) method
-  /// for semantics.
-  ///
-  /// Side effect:
-  ///   Also sends initial metadata if not already sent (using the
-  ///   \a ClientContext associated with this call).
-  using ::grpc::internal::WriterInterface<W>::Write;
-  bool Write(const W& msg, WriteOptions options) override {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                                ::grpc::internal::CallOpSendMessage,
-                                ::grpc::internal::CallOpClientSendClose>
-        ops;
-
-    if (options.is_last_message()) {
-      options.set_buffer_hint();
-      ops.ClientSendClose();
-    }
-    if (context_->initial_metadata_corked_) {
-      ops.SendInitialMetadata(context_->send_initial_metadata_,
-                              context_->initial_metadata_flags());
-      context_->set_initial_metadata_corked(false);
-    }
-    if (!ops.SendMessage(msg, options).ok()) {
-      return false;
-    }
-
-    call_.PerformOps(&ops);
-    return cq_.Pluck(&ops);
-  }
-
-  bool WritesDone() override {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpClientSendClose> ops;
-    ops.ClientSendClose();
-    call_.PerformOps(&ops);
-    return cq_.Pluck(&ops);
-  }
-
-  /// See the ClientStreamingInterface.Finish method for semantics.
-  /// Side effects:
-  ///   - Also receives initial metadata if not already received.
-  ///   - Attempts to fill in the \a response parameter passed
-  ///     to the constructor of this instance with the response
-  ///     message from the server.
-  Status Finish() override {
-    Status status;
-    if (!context_->initial_metadata_received_) {
-      finish_ops_.RecvInitialMetadata(context_);
-    }
-    finish_ops_.ClientRecvStatus(context_, &status);
-    call_.PerformOps(&finish_ops_);
-    GPR_CODEGEN_ASSERT(cq_.Pluck(&finish_ops_));
-    return status;
-  }
-
- private:
-  friend class internal::ClientWriterFactory<W>;
-
-  /// Block to create a stream (i.e. send request headers and other initial
-  /// metadata to the server). Note that \a context will be used to fill
-  /// in custom initial metadata. \a response will be filled in with the
-  /// single expected response message from the server upon a successful
-  /// call to the \a Finish method of this instance.
-  template <class R>
-  ClientWriter(ChannelInterface* channel,
-               const ::grpc::internal::RpcMethod& method,
-               ClientContext* context, R* response)
-      : context_(context),
-        cq_(grpc_completion_queue_attributes{
-            GRPC_CQ_CURRENT_VERSION, GRPC_CQ_PLUCK,
-            GRPC_CQ_DEFAULT_POLLING}),  // Pluckable cq
-        call_(channel->CreateCall(method, context, &cq_)) {
-    finish_ops_.RecvMessage(response);
-    finish_ops_.AllowNoMessage();
-
-    if (!context_->initial_metadata_corked_) {
-      ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata>
-          ops;
-      ops.SendInitialMetadata(context->send_initial_metadata_,
-                              context->initial_metadata_flags());
-      call_.PerformOps(&ops);
-      cq_.Pluck(&ops);
-    }
-  }
-
-  ClientContext* context_;
-  ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                              ::grpc::internal::CallOpGenericRecvMessage,
-                              ::grpc::internal::CallOpClientRecvStatus>
-      finish_ops_;
-  CompletionQueue cq_;
-  ::grpc::internal::Call call_;
-};
-
-/// Client-side interface for bi-directional streaming with
-/// client-to-server stream messages of type \a W and
-/// server-to-client stream messages of type \a R.
-template <class W, class R>
-class ClientReaderWriterInterface : public internal::ClientStreamingInterface,
-                                    public internal::WriterInterface<W>,
-                                    public internal::ReaderInterface<R> {
- public:
-  /// Block to wait for initial metadata from server. The received metadata
-  /// can only be accessed after this call returns. Should only be called before
-  /// the first read. Calling this method is optional, and if it is not called
-  /// the metadata will be available in ClientContext after the first read.
-  virtual void WaitForInitialMetadata() = 0;
-
-  /// Half close writing from the client. (signal that the stream of messages
-  /// coming from the clinet is complete).
-  /// Blocks until currently-pending writes are completed.
-  /// Thread-safe with respect to \a ReaderInterface::Read
-  ///
-  /// \return Whether the writes were successful.
-  virtual bool WritesDone() = 0;
-};
-
-namespace internal {
-template <class W, class R>
-class ClientReaderWriterFactory {
- public:
-  static ClientReaderWriter<W, R>* Create(
-      ::grpc::ChannelInterface* channel,
-      const ::grpc::internal::RpcMethod& method, ClientContext* context) {
-    return new ClientReaderWriter<W, R>(channel, method, context);
-  }
-};
-}  // namespace internal
-
-/// Synchronous (blocking) client-side API for bi-directional streaming RPCs,
-/// where the outgoing message stream coming from the client has messages of
-/// type \a W, and the incoming messages stream coming from the server has
-/// messages of type \a R.
-template <class W, class R>
-class ClientReaderWriter final : public ClientReaderWriterInterface<W, R> {
- public:
-  /// Block waiting to read initial metadata from the server.
-  /// This call is optional, but if it is used, it cannot be used concurrently
-  /// with or after the \a Finish method.
-  ///
-  /// Once complete, the initial metadata read from the server will be
-  /// accessable through the \a ClientContext used to construct this object.
-  void WaitForInitialMetadata() override {
-    GPR_CODEGEN_ASSERT(!context_->initial_metadata_received_);
-
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata>
-        ops;
-    ops.RecvInitialMetadata(context_);
-    call_.PerformOps(&ops);
-    cq_.Pluck(&ops);  // status ignored
-  }
-
-  bool NextMessageSize(uint32_t* sz) override {
-    *sz = call_.max_receive_message_size();
-    return true;
-  }
-
-  /// See the \a ReaderInterface.Read method for semantics.
-  /// Side effect:
-  ///   Also receives initial metadata if not already received (updates the \a
-  ///   ClientContext associated with this call in that case).
-  bool Read(R* msg) override {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                                ::grpc::internal::CallOpRecvMessage<R>>
-        ops;
-    if (!context_->initial_metadata_received_) {
-      ops.RecvInitialMetadata(context_);
-    }
-    ops.RecvMessage(msg);
-    call_.PerformOps(&ops);
-    return cq_.Pluck(&ops) && ops.got_message;
-  }
-
-  /// See the \a WriterInterface.Write method for semantics.
-  ///
-  /// Side effect:
-  ///   Also sends initial metadata if not already sent (using the
-  ///   \a ClientContext associated with this call to fill in values).
-  using ::grpc::internal::WriterInterface<W>::Write;
-  bool Write(const W& msg, WriteOptions options) override {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata,
-                                ::grpc::internal::CallOpSendMessage,
-                                ::grpc::internal::CallOpClientSendClose>
-        ops;
-
-    if (options.is_last_message()) {
-      options.set_buffer_hint();
-      ops.ClientSendClose();
-    }
-    if (context_->initial_metadata_corked_) {
-      ops.SendInitialMetadata(context_->send_initial_metadata_,
-                              context_->initial_metadata_flags());
-      context_->set_initial_metadata_corked(false);
-    }
-    if (!ops.SendMessage(msg, options).ok()) {
-      return false;
-    }
-
-    call_.PerformOps(&ops);
-    return cq_.Pluck(&ops);
-  }
-
-  bool WritesDone() override {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpClientSendClose> ops;
-    ops.ClientSendClose();
-    call_.PerformOps(&ops);
-    return cq_.Pluck(&ops);
-  }
-
-  /// See the ClientStreamingInterface.Finish method for semantics.
-  ///
-  /// Side effect:
-  ///   - the \a ClientContext associated with this call is updated with
-  ///     possible trailing metadata sent from the server.
-  Status Finish() override {
-    ::grpc::internal::CallOpSet<::grpc::internal::CallOpRecvInitialMetadata,
-                                ::grpc::internal::CallOpClientRecvStatus>
-        ops;
-    if (!context_->initial_metadata_received_) {
-      ops.RecvInitialMetadata(context_);
-    }
-    Status status;
-    ops.ClientRecvStatus(context_, &status);
-    call_.PerformOps(&ops);
-    GPR_CODEGEN_ASSERT(cq_.Pluck(&ops));
-    return status;
-  }
-
- private:
-  friend class internal::ClientReaderWriterFactory<W, R>;
-
-  ClientContext* context_;
-  CompletionQueue cq_;
-  ::grpc::internal::Call call_;
-
-  /// Block to create a stream and write the initial metadata and \a request
-  /// out. Note that \a context will be used to fill in custom initial metadata
-  /// used to send to the server when starting the call.
-  ClientReaderWriter(::grpc::ChannelInterface* channel,
-                     const ::grpc::internal::RpcMethod& method,
-                     ClientContext* context)
-      : context_(context),
-        cq_(grpc_completion_queue_attributes{
-            GRPC_CQ_CURRENT_VERSION, GRPC_CQ_PLUCK,
-            GRPC_CQ_DEFAULT_POLLING}),  // Pluckable cq
-        call_(channel->CreateCall(method, context, &cq_)) {
-    if (!context_->initial_metadata_corked_) {
-      ::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata>
-          ops;
-      ops.SendInitialMetadata(context->send_initial_metadata_,
-                              context->initial_metadata_flags());
-      call_.PerformOps(&ops);
-      cq_.Pluck(&ops);
-    }
-  }
-};
-
-/// Server-side interface for streaming reads of message of type \a R.
-template <class R>
-class ServerReaderInterface : public internal::ServerStreamingInterface,
-                              public internal::ReaderInterface<R> {};
-
-/// Synchronous (blocking) server-side API for doing client-streaming RPCs,
-/// where the incoming message stream coming from the client has messages of
-/// type \a R.
-template <class R>
-class ServerReader final : public ServerReaderInterface<R> {
- public:
-  /// See the \a ServerStreamingInterface.SendInitialMetadata method
-  /// for semantics. Note that initial metadata will be affected by the
-  /// \a ServerContext associated with this call.
-  void SendInitialMetadata() override {
-    GPR_CODEGEN_ASSERT(!ctx_->sent_initial_metadata_);
-
-    internal::CallOpSet<internal::CallOpSendInitialMetadata> ops;
-    ops.SendInitialMetadata(ctx_->initial_metadata_,
-                            ctx_->initial_metadata_flags());
-    if (ctx_->compression_level_set()) {
-      ops.set_compression_level(ctx_->compression_level());
-    }
-    ctx_->sent_initial_metadata_ = true;
-    call_->PerformOps(&ops);
-    call_->cq()->Pluck(&ops);
-  }
-
-  bool NextMessageSize(uint32_t* sz) override {
-    *sz = call_->max_receive_message_size();
-    return true;
-  }
-
-  bool Read(R* msg) override {
-    internal::CallOpSet<internal::CallOpRecvMessage<R>> ops;
-    ops.RecvMessage(msg);
-    call_->PerformOps(&ops);
-    return call_->cq()->Pluck(&ops) && ops.got_message;
-  }
-
- private:
-  internal::Call* const call_;
-  ServerContext* const ctx_;
-
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class internal::ClientStreamingHandler;
-
-  ServerReader(internal::Call* call, ServerContext* ctx)
-      : call_(call), ctx_(ctx) {}
-};
-
-/// Server-side interface for streaming writes of message of type \a W.
-template <class W>
-class ServerWriterInterface : public internal::ServerStreamingInterface,
-                              public internal::WriterInterface<W> {};
-
-/// Synchronous (blocking) server-side API for doing for doing a
-/// server-streaming RPCs, where the outgoing message stream coming from the
-/// server has messages of type \a W.
-template <class W>
-class ServerWriter final : public ServerWriterInterface<W> {
- public:
-  /// See the \a ServerStreamingInterface.SendInitialMetadata method
-  /// for semantics.
-  /// Note that initial metadata will be affected by the
-  /// \a ServerContext associated with this call.
-  void SendInitialMetadata() override {
-    GPR_CODEGEN_ASSERT(!ctx_->sent_initial_metadata_);
-
-    internal::CallOpSet<internal::CallOpSendInitialMetadata> ops;
-    ops.SendInitialMetadata(ctx_->initial_metadata_,
-                            ctx_->initial_metadata_flags());
-    if (ctx_->compression_level_set()) {
-      ops.set_compression_level(ctx_->compression_level());
-    }
-    ctx_->sent_initial_metadata_ = true;
-    call_->PerformOps(&ops);
-    call_->cq()->Pluck(&ops);
-  }
-
-  /// See the \a WriterInterface.Write method for semantics.
-  ///
-  /// Side effect:
-  ///   Also sends initial metadata if not already sent (using the
-  ///   \a ClientContext associated with this call to fill in values).
-  using internal::WriterInterface<W>::Write;
-  bool Write(const W& msg, WriteOptions options) override {
-    if (options.is_last_message()) {
-      options.set_buffer_hint();
-    }
-
-    if (!ctx_->pending_ops_.SendMessage(msg, options).ok()) {
-      return false;
-    }
-    if (!ctx_->sent_initial_metadata_) {
-      ctx_->pending_ops_.SendInitialMetadata(ctx_->initial_metadata_,
-                                             ctx_->initial_metadata_flags());
-      if (ctx_->compression_level_set()) {
-        ctx_->pending_ops_.set_compression_level(ctx_->compression_level());
-      }
-      ctx_->sent_initial_metadata_ = true;
-    }
-    call_->PerformOps(&ctx_->pending_ops_);
-    // if this is the last message we defer the pluck until AFTER we start
-    // the trailing md op. This prevents hangs. See
-    // https://github.com/grpc/grpc/issues/11546
-    if (options.is_last_message()) {
-      ctx_->has_pending_ops_ = true;
-      return true;
-    }
-    ctx_->has_pending_ops_ = false;
-    return call_->cq()->Pluck(&ctx_->pending_ops_);
-  }
-
- private:
-  internal::Call* const call_;
-  ServerContext* const ctx_;
-
-  template <class ServiceType, class RequestType, class ResponseType>
-  friend class internal::ServerStreamingHandler;
-
-  ServerWriter(internal::Call* call, ServerContext* ctx)
-      : call_(call), ctx_(ctx) {}
-};
-
-/// Server-side interface for bi-directional streaming.
-template <class W, class R>
-class ServerReaderWriterInterface : public internal::ServerStreamingInterface,
-                                    public internal::WriterInterface<W>,
-                                    public internal::ReaderInterface<R> {};
-
-/// Actual implementation of bi-directional streaming
-namespace internal {
-template <class W, class R>
-class ServerReaderWriterBody final {
- public:
-  ServerReaderWriterBody(Call* call, ServerContext* ctx)
-      : call_(call), ctx_(ctx) {}
-
-  void SendInitialMetadata() {
-    GPR_CODEGEN_ASSERT(!ctx_->sent_initial_metadata_);
-
-    CallOpSet<CallOpSendInitialMetadata> ops;
-    ops.SendInitialMetadata(ctx_->initial_metadata_,
-                            ctx_->initial_metadata_flags());
-    if (ctx_->compression_level_set()) {
-      ops.set_compression_level(ctx_->compression_level());
-    }
-    ctx_->sent_initial_metadata_ = true;
-    call_->PerformOps(&ops);
-    call_->cq()->Pluck(&ops);
-  }
-
-  bool NextMessageSize(uint32_t* sz) {
-    *sz = call_->max_receive_message_size();
-    return true;
-  }
-
-  bool Read(R* msg) {
-    CallOpSet<CallOpRecvMessage<R>> ops;
-    ops.RecvMessage(msg);
-    call_->PerformOps(&ops);
-    return call_->cq()->Pluck(&ops) && ops.got_message;
-  }
-
-  bool Write(const W& msg, WriteOptions options) {
-    if (options.is_last_message()) {
-      options.set_buffer_hint();
-    }
-    if (!ctx_->pending_ops_.SendMessage(msg, options).ok()) {
-      return false;
-    }
-    if (!ctx_->sent_initial_metadata_) {
-      ctx_->pending_ops_.SendInitialMetadata(ctx_->initial_metadata_,
-                                             ctx_->initial_metadata_flags());
-      if (ctx_->compression_level_set()) {
-        ctx_->pending_ops_.set_compression_level(ctx_->compression_level());
-      }
-      ctx_->sent_initial_metadata_ = true;
-    }
-    call_->PerformOps(&ctx_->pending_ops_);
-    // if this is the last message we defer the pluck until AFTER we start
-    // the trailing md op. This prevents hangs. See
-    // https://github.com/grpc/grpc/issues/11546
-    if (options.is_last_message()) {
-      ctx_->has_pending_ops_ = true;
-      return true;
-    }
-    ctx_->has_pending_ops_ = false;
-    return call_->cq()->Pluck(&ctx_->pending_ops_);
-  }
-
- private:
-  Call* const call_;
-  ServerContext* const ctx_;
-};
-
-}  // namespace internal
-
-/// Synchronous (blocking) server-side API for a bidirectional
-/// streaming call, where the incoming message stream coming from the client has
-/// messages of type \a R, and the outgoing message streaming coming from
-/// the server has messages of type \a W.
-template <class W, class R>
-class ServerReaderWriter final : public ServerReaderWriterInterface<W, R> {
- public:
-  /// See the \a ServerStreamingInterface.SendInitialMetadata method
-  /// for semantics. Note that initial metadata will be affected by the
-  /// \a ServerContext associated with this call.
-  void SendInitialMetadata() override { body_.SendInitialMetadata(); }
-
-  bool NextMessageSize(uint32_t* sz) override {
-    return body_.NextMessageSize(sz);
-  }
-
-  bool Read(R* msg) override { return body_.Read(msg); }
-
-  /// See the \a WriterInterface.Write(const W& msg, WriteOptions options)
-  /// method for semantics.
-  /// Side effect:
-  ///   Also sends initial metadata if not already sent (using the \a
-  ///   ServerContext associated with this call).
-  using internal::WriterInterface<W>::Write;
-  bool Write(const W& msg, WriteOptions options) override {
-    return body_.Write(msg, options);
-  }
-
- private:
-  internal::ServerReaderWriterBody<W, R> body_;
-
-  friend class internal::TemplatedBidiStreamingHandler<ServerReaderWriter<W, R>,
-                                                       false>;
-  ServerReaderWriter(internal::Call* call, ServerContext* ctx)
-      : body_(call, ctx) {}
-};
-
-/// A class to represent a flow-controlled unary call. This is something
-/// of a hybrid between conventional unary and streaming. This is invoked
-/// through a unary call on the client side, but the server responds to it
-/// as though it were a single-ping-pong streaming call. The server can use
-/// the \a NextMessageSize method to determine an upper-bound on the size of
-/// the message. A key difference relative to streaming: ServerUnaryStreamer
-/// must have exactly 1 Read and exactly 1 Write, in that order, to function
-/// correctly. Otherwise, the RPC is in error.
-template <class RequestType, class ResponseType>
-class ServerUnaryStreamer final
-    : public ServerReaderWriterInterface<ResponseType, RequestType> {
- public:
-  /// Block to send initial metadata to client.
-  /// Implicit input parameter:
-  ///    - the \a ServerContext associated with this call will be used for
-  ///      sending initial metadata.
-  void SendInitialMetadata() override { body_.SendInitialMetadata(); }
-
-  /// Get an upper bound on the request message size from the client.
-  bool NextMessageSize(uint32_t* sz) override {
-    return body_.NextMessageSize(sz);
-  }
-
-  /// Read a message of type \a R into \a msg. Completion will be notified by \a
-  /// tag on the associated completion queue.
-  /// This is thread-safe with respect to \a Write or \a WritesDone methods. It
-  /// should not be called concurrently with other streaming APIs
-  /// on the same stream. It is not meaningful to call it concurrently
-  /// with another \a ReaderInterface::Read on the same stream since reads on
-  /// the same stream are delivered in order.
-  ///
-  /// \param[out] msg Where to eventually store the read message.
-  /// \param[in] tag The tag identifying the operation.
-  bool Read(RequestType* request) override {
-    if (read_done_) {
-      return false;
-    }
-    read_done_ = true;
-    return body_.Read(request);
-  }
-
-  /// Block to write \a msg to the stream with WriteOptions \a options.
-  /// This is thread-safe with respect to \a ReaderInterface::Read
-  ///
-  /// \param msg The message to be written to the stream.
-  /// \param options The WriteOptions affecting the write operation.
-  ///
-  /// \return \a true on success, \a false when the stream has been closed.
-  using internal::WriterInterface<ResponseType>::Write;
-  bool Write(const ResponseType& response, WriteOptions options) override {
-    if (write_done_ || !read_done_) {
-      return false;
-    }
-    write_done_ = true;
-    return body_.Write(response, options);
-  }
-
- private:
-  internal::ServerReaderWriterBody<ResponseType, RequestType> body_;
-  bool read_done_;
-  bool write_done_;
-
-  friend class internal::TemplatedBidiStreamingHandler<
-      ServerUnaryStreamer<RequestType, ResponseType>, true>;
-  ServerUnaryStreamer(internal::Call* call, ServerContext* ctx)
-      : body_(call, ctx), read_done_(false), write_done_(false) {}
-};
-
-/// A class to represent a flow-controlled server-side streaming call.
-/// This is something of a hybrid between server-side and bidi streaming.
-/// This is invoked through a server-side streaming call on the client side,
-/// but the server responds to it as though it were a bidi streaming call that
-/// must first have exactly 1 Read and then any number of Writes.
-template <class RequestType, class ResponseType>
-class ServerSplitStreamer final
-    : public ServerReaderWriterInterface<ResponseType, RequestType> {
- public:
-  /// Block to send initial metadata to client.
-  /// Implicit input parameter:
-  ///    - the \a ServerContext associated with this call will be used for
-  ///      sending initial metadata.
-  void SendInitialMetadata() override { body_.SendInitialMetadata(); }
-
-  /// Get an upper bound on the request message size from the client.
-  bool NextMessageSize(uint32_t* sz) override {
-    return body_.NextMessageSize(sz);
-  }
-
-  /// Read a message of type \a R into \a msg. Completion will be notified by \a
-  /// tag on the associated completion queue.
-  /// This is thread-safe with respect to \a Write or \a WritesDone methods. It
-  /// should not be called concurrently with other streaming APIs
-  /// on the same stream. It is not meaningful to call it concurrently
-  /// with another \a ReaderInterface::Read on the same stream since reads on
-  /// the same stream are delivered in order.
-  ///
-  /// \param[out] msg Where to eventually store the read message.
-  /// \param[in] tag The tag identifying the operation.
-  bool Read(RequestType* request) override {
-    if (read_done_) {
-      return false;
-    }
-    read_done_ = true;
-    return body_.Read(request);
-  }
-
-  /// Block to write \a msg to the stream with WriteOptions \a options.
-  /// This is thread-safe with respect to \a ReaderInterface::Read
-  ///
-  /// \param msg The message to be written to the stream.
-  /// \param options The WriteOptions affecting the write operation.
-  ///
-  /// \return \a true on success, \a false when the stream has been closed.
-  using internal::WriterInterface<ResponseType>::Write;
-  bool Write(const ResponseType& response, WriteOptions options) override {
-    return read_done_ && body_.Write(response, options);
-  }
-
- private:
-  internal::ServerReaderWriterBody<ResponseType, RequestType> body_;
-  bool read_done_;
-
-  friend class internal::TemplatedBidiStreamingHandler<
-      ServerSplitStreamer<RequestType, ResponseType>, false>;
-  ServerSplitStreamer(internal::Call* call, ServerContext* ctx)
-      : body_(call, ctx), read_done_(false) {}
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/sync_stream.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_SYNC_STREAM_H
diff --git a/include/grpc++/impl/codegen/time.h b/include/grpc++/impl/codegen/time.h
index d464d6ea13..f9b70f8313 100644
--- a/include/grpc++/impl/codegen/time.h
+++ b/include/grpc++/impl/codegen/time.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,74 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_CODEGEN_TIME_H
 #define GRPCXX_IMPL_CODEGEN_TIME_H
 
-#include <chrono>
-
-#include <grpc++/impl/codegen/config.h>
-#include <grpc/impl/codegen/grpc_types.h>
-
-namespace grpc {
-
-/** If you are trying to use CompletionQueue::AsyncNext with a time class that
-    isn't either gpr_timespec or std::chrono::system_clock::time_point, you
-    will most likely be looking at this comment as your compiler will have
-    fired an error below. In order to fix this issue, you have two potential
-    solutions:
-
-      1. Use gpr_timespec or std::chrono::system_clock::time_point instead
-      2. Specialize the TimePoint class with whichever time class that you
-         want to use here. See below for two examples of how to do this.
- */
-template <typename T>
-class TimePoint {
- public:
-  TimePoint(const T& time) { you_need_a_specialization_of_TimePoint(); }
-  gpr_timespec raw_time() {
-    gpr_timespec t;
-    return t;
-  }
-
- private:
-  void you_need_a_specialization_of_TimePoint();
-};
-
-template <>
-class TimePoint<gpr_timespec> {
- public:
-  TimePoint(const gpr_timespec& time) : time_(time) {}
-  gpr_timespec raw_time() { return time_; }
-
- private:
-  gpr_timespec time_;
-};
-
-}  // namespace grpc
-
-namespace grpc {
-
-// from and to should be absolute time.
-void Timepoint2Timespec(const std::chrono::system_clock::time_point& from,
-                        gpr_timespec* to);
-void TimepointHR2Timespec(
-    const std::chrono::high_resolution_clock::time_point& from,
-    gpr_timespec* to);
-
-std::chrono::system_clock::time_point Timespec2Timepoint(gpr_timespec t);
-
-template <>
-class TimePoint<std::chrono::system_clock::time_point> {
- public:
-  TimePoint(const std::chrono::system_clock::time_point& time) {
-    Timepoint2Timespec(time, &time_);
-  }
-  gpr_timespec raw_time() const { return time_; }
-
- private:
-  gpr_timespec time_;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/codegen/time.h>
 
 #endif  // GRPCXX_IMPL_CODEGEN_TIME_H
diff --git a/include/grpc++/impl/grpc_library.h b/include/grpc++/impl/grpc_library.h
index 55c867ddff..f34a281ac3 100644
--- a/include/grpc++/impl/grpc_library.h
+++ b/include/grpc++/impl/grpc_library.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,46 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_GRPC_LIBRARY_H
 #define GRPCXX_IMPL_GRPC_LIBRARY_H
 
-#include <iostream>
-
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/core_codegen.h>
-#include <grpc++/impl/codegen/grpc_library.h>
-#include <grpc/grpc.h>
-
-namespace grpc {
-
-namespace internal {
-class GrpcLibrary final : public GrpcLibraryInterface {
- public:
-  void init() override { grpc_init(); }
-  void shutdown() override { grpc_shutdown(); }
-};
-
-static GrpcLibrary g_gli;
-static CoreCodegen g_core_codegen;
-
-/// Instantiating this class ensures the proper initialization of gRPC.
-class GrpcLibraryInitializer final {
- public:
-  GrpcLibraryInitializer() {
-    if (grpc::g_glip == nullptr) {
-      grpc::g_glip = &g_gli;
-    }
-    if (grpc::g_core_codegen_interface == nullptr) {
-      grpc::g_core_codegen_interface = &g_core_codegen;
-    }
-  }
-
-  /// A no-op method to force the linker to reference this class, which will
-  /// take care of initializing and shutting down the gRPC runtime.
-  int summon() { return 0; }
-};
-
-}  // namespace internal
-}  // namespace grpc
+#include <grpcpp/impl/grpc_library.h>
 
 #endif  // GRPCXX_IMPL_GRPC_LIBRARY_H
diff --git a/include/grpc++/impl/method_handler_impl.h b/include/grpc++/impl/method_handler_impl.h
index 0b1ab027d9..3840f48742 100644
--- a/include/grpc++/impl/method_handler_impl.h
+++ b/include/grpc++/impl/method_handler_impl.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_METHOD_HANDLER_IMPL_H
 #define GRPCXX_IMPL_METHOD_HANDLER_IMPL_H
 
-#include <grpc++/impl/codegen/method_handler_impl.h>
+#include <grpcpp/impl/method_handler_impl.h>
 
 #endif  // GRPCXX_IMPL_METHOD_HANDLER_IMPL_H
diff --git a/include/grpc++/impl/rpc_method.h b/include/grpc++/impl/rpc_method.h
index 51e95bb157..7cba7c40c4 100644
--- a/include/grpc++/impl/rpc_method.h
+++ b/include/grpc++/impl/rpc_method.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_RPC_METHOD_H
 #define GRPCXX_IMPL_RPC_METHOD_H
 
-#include <grpc++/impl/codegen/rpc_method.h>
+#include <grpcpp/impl/rpc_method.h>
 
 #endif  // GRPCXX_IMPL_RPC_METHOD_H
diff --git a/include/grpc++/impl/rpc_service_method.h b/include/grpc++/impl/rpc_service_method.h
index efde374e7e..2c75087b7c 100644
--- a/include/grpc++/impl/rpc_service_method.h
+++ b/include/grpc++/impl/rpc_service_method.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_RPC_SERVICE_METHOD_H
 #define GRPCXX_IMPL_RPC_SERVICE_METHOD_H
 
-#include <grpc++/impl/codegen/rpc_service_method.h>
+#include <grpcpp/impl/rpc_service_method.h>
 
 #endif  // GRPCXX_IMPL_RPC_SERVICE_METHOD_H
diff --git a/include/grpc++/impl/serialization_traits.h b/include/grpc++/impl/serialization_traits.h
index 91e894c98a..33b3a0bb31 100644
--- a/include/grpc++/impl/serialization_traits.h
+++ b/include/grpc++/impl/serialization_traits.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_SERIALIZATION_TRAITS_H
 #define GRPCXX_IMPL_SERIALIZATION_TRAITS_H
 
-#include <grpc++/impl/codegen/serialization_traits.h>
+#include <grpcpp/impl/serialization_traits.h>
 
 #endif  // GRPCXX_IMPL_SERIALIZATION_TRAITS_H
diff --git a/include/grpc++/impl/server_builder_option.h b/include/grpc++/impl/server_builder_option.h
index ab04a1c997..833f8db772 100644
--- a/include/grpc++/impl/server_builder_option.h
+++ b/include/grpc++/impl/server_builder_option.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,28 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_SERVER_BUILDER_OPTION_H
 #define GRPCXX_IMPL_SERVER_BUILDER_OPTION_H
 
-#include <map>
-#include <memory>
-
-#include <grpc++/impl/server_builder_plugin.h>
-#include <grpc++/support/channel_arguments.h>
-
-namespace grpc {
-
-/// Interface to pass an option to a \a ServerBuilder.
-class ServerBuilderOption {
- public:
-  virtual ~ServerBuilderOption() {}
-  /// Alter the \a ChannelArguments used to create the gRPC server.
-  virtual void UpdateArguments(ChannelArguments* args) = 0;
-  /// Alter the ServerBuilderPlugin map that will be added into ServerBuilder.
-  virtual void UpdatePlugins(
-      std::vector<std::unique_ptr<ServerBuilderPlugin>>* plugins) = 0;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/server_builder_option.h>
 
 #endif  // GRPCXX_IMPL_SERVER_BUILDER_OPTION_H
diff --git a/include/grpc++/impl/server_builder_plugin.h b/include/grpc++/impl/server_builder_plugin.h
index e15cd7b4c9..844d32c55f 100644
--- a/include/grpc++/impl/server_builder_plugin.h
+++ b/include/grpc++/impl/server_builder_plugin.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,50 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_SERVER_BUILDER_PLUGIN_H
 #define GRPCXX_IMPL_SERVER_BUILDER_PLUGIN_H
 
-#include <memory>
-
-#include <grpc++/support/config.h>
-
-namespace grpc {
-
-class ServerBuilder;
-class ServerInitializer;
-class ChannelArguments;
-
-/// This interface is meant for internal usage only. Implementations of this
-/// interface should add themselves to a \a ServerBuilder instance through the
-/// \a InternalAddPluginFactory method.
-class ServerBuilderPlugin {
- public:
-  virtual ~ServerBuilderPlugin() {}
-  virtual grpc::string name() = 0;
-
-  /// UpdateServerBuilder will be called at the beginning of
-  /// \a ServerBuilder::BuildAndStart().
-  virtual void UpdateServerBuilder(ServerBuilder* builder) {}
-
-  /// InitServer will be called in ServerBuilder::BuildAndStart(), after the
-  /// Server instance is created.
-  virtual void InitServer(ServerInitializer* si) = 0;
-
-  /// Finish will be called at the end of ServerBuilder::BuildAndStart().
-  virtual void Finish(ServerInitializer* si) = 0;
-
-  /// ChangeArguments is an interface that can be used in
-  /// ServerBuilderOption::UpdatePlugins
-  virtual void ChangeArguments(const grpc::string& name, void* value) = 0;
-
-  /// UpdateChannelArguments will be called in ServerBuilder::BuildAndStart(),
-  /// before the Server instance is created.
-  virtual void UpdateChannelArguments(ChannelArguments* args) {}
-
-  virtual bool has_sync_methods() const { return false; }
-  virtual bool has_async_methods() const { return false; }
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/server_builder_plugin.h>
 
 #endif  // GRPCXX_IMPL_SERVER_BUILDER_PLUGIN_H
diff --git a/include/grpc++/impl/server_initializer.h b/include/grpc++/impl/server_initializer.h
index 873c46fb31..6a1669ccf5 100644
--- a/include/grpc++/impl/server_initializer.h
+++ b/include/grpc++/impl/server_initializer.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,40 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_SERVER_INITIALIZER_H
 #define GRPCXX_IMPL_SERVER_INITIALIZER_H
 
-#include <memory>
-#include <vector>
-
-#include <grpc++/server.h>
-
-namespace grpc {
-
-class Server;
-class Service;
-
-class ServerInitializer {
- public:
-  ServerInitializer(Server* server) : server_(server) {}
-
-  bool RegisterService(std::shared_ptr<Service> service) {
-    if (!server_->RegisterService(nullptr, service.get())) {
-      return false;
-    }
-    default_services_.push_back(service);
-    return true;
-  }
-
-  const std::vector<grpc::string>* GetServiceList() {
-    return &server_->services_;
-  }
-
- private:
-  Server* server_;
-  std::vector<std::shared_ptr<Service> > default_services_;
-};
-
-}  // namespace grpc
+#include <grpcpp/impl/server_initializer.h>
 
 #endif  // GRPCXX_IMPL_SERVER_INITIALIZER_H
diff --git a/include/grpc++/impl/service_type.h b/include/grpc++/impl/service_type.h
index 6a9e90a974..86422160d4 100644
--- a/include/grpc++/impl/service_type.h
+++ b/include/grpc++/impl/service_type.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_SERVICE_TYPE_H
 #define GRPCXX_IMPL_SERVICE_TYPE_H
 
-#include <grpc++/impl/codegen/service_type.h>
+#include <grpcpp/impl/service_type.h>
 
 #endif  // GRPCXX_IMPL_SERVICE_TYPE_H
diff --git a/include/grpc++/impl/sync_cxx11.h b/include/grpc++/impl/sync_cxx11.h
index 64d467f30d..8bcfb2ce81 100644
--- a/include/grpc++/impl/sync_cxx11.h
+++ b/include/grpc++/impl/sync_cxx11.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_SYNC_CXX11_H
 #define GRPCXX_IMPL_SYNC_CXX11_H
 
-#include <grpc++/impl/codegen/sync_cxx11.h>
+#include <grpcpp/impl/sync_cxx11.h>
 
 #endif  // GRPCXX_IMPL_SYNC_CXX11_H
diff --git a/include/grpc++/impl/sync_no_cxx11.h b/include/grpc++/impl/sync_no_cxx11.h
index cc0177ef76..5264567387 100644
--- a/include/grpc++/impl/sync_no_cxx11.h
+++ b/include/grpc++/impl/sync_no_cxx11.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_IMPL_SYNC_NO_CXX11_H
 #define GRPCXX_IMPL_SYNC_NO_CXX11_H
 
-#include <grpc++/impl/codegen/sync_no_cxx11.h>
+#include <grpcpp/impl/sync_no_cxx11.h>
 
 #endif  // GRPCXX_IMPL_SYNC_NO_CXX11_H
diff --git a/include/grpc++/resource_quota.h b/include/grpc++/resource_quota.h
index ef214dba39..aad1b5659f 100644
--- a/include/grpc++/resource_quota.h
+++ b/include/grpc++/resource_quota.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,43 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_RESOURCE_QUOTA_H
 #define GRPCXX_RESOURCE_QUOTA_H
 
-struct grpc_resource_quota;
-
-#include <grpc++/impl/codegen/config.h>
-#include <grpc++/impl/codegen/grpc_library.h>
-
-namespace grpc {
-
-/// ResourceQuota represents a bound on memory usage by the gRPC library.
-/// A ResourceQuota can be attached to a server (via \a ServerBuilder),
-/// or a client channel (via \a ChannelArguments).
-/// gRPC will attempt to keep memory used by all attached entities
-/// below the ResourceQuota bound.
-class ResourceQuota final : private GrpcLibraryCodegen {
- public:
-  /// \param name - a unique name for this ResourceQuota.
-  explicit ResourceQuota(const grpc::string& name);
-  ResourceQuota();
-  ~ResourceQuota();
-
-  /// Resize this \a ResourceQuota to a new size. If \a new_size is smaller
-  /// than the current size of the pool, memory usage will be monotonically
-  /// decreased until it falls under \a new_size.
-  /// No time bound is given for this to occur however.
-  ResourceQuota& Resize(size_t new_size);
-
-  grpc_resource_quota* c_resource_quota() const { return impl_; }
-
- private:
-  ResourceQuota(const ResourceQuota& rhs);
-  ResourceQuota& operator=(const ResourceQuota& rhs);
-
-  grpc_resource_quota* const impl_;
-};
-
-}  // namespace grpc
+#include <grpcpp/resource_quota.h>
 
 #endif  // GRPCXX_RESOURCE_QUOTA_H
diff --git a/include/grpc++/security/auth_context.h b/include/grpc++/security/auth_context.h
index 71f5d6e5b3..9fe59d448e 100644
--- a/include/grpc++/security/auth_context.h
+++ b/include/grpc++/security/auth_context.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SECURITY_AUTH_CONTEXT_H
 #define GRPCXX_SECURITY_AUTH_CONTEXT_H
 
-#include <grpc++/impl/codegen/security/auth_context.h>
+#include <grpcpp/security/auth_context.h>
 
 #endif  // GRPCXX_SECURITY_AUTH_CONTEXT_H
diff --git a/include/grpc++/security/auth_metadata_processor.h b/include/grpc++/security/auth_metadata_processor.h
index a49e30f891..d045313965 100644
--- a/include/grpc++/security/auth_metadata_processor.h
+++ b/include/grpc++/security/auth_metadata_processor.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,46 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SECURITY_AUTH_METADATA_PROCESSOR_H
 #define GRPCXX_SECURITY_AUTH_METADATA_PROCESSOR_H
 
-#include <map>
-
-#include <grpc++/security/auth_context.h>
-#include <grpc++/support/status.h>
-#include <grpc++/support/string_ref.h>
-
-namespace grpc {
-
-/// Interface allowing custom server-side authorization based on credentials
-/// encoded in metadata.  Objects of this type can be passed to
-/// \a ServerCredentials::SetAuthMetadataProcessor().
-class AuthMetadataProcessor {
- public:
-  typedef std::multimap<grpc::string_ref, grpc::string_ref> InputMetadata;
-  typedef std::multimap<grpc::string, grpc::string> OutputMetadata;
-
-  virtual ~AuthMetadataProcessor() {}
-
-  /// If this method returns true, the \a Process function will be scheduled in
-  /// a different thread from the one processing the call.
-  virtual bool IsBlocking() const { return true; }
-
-  /// context is read/write: it contains the properties of the channel peer and
-  /// it is the job of the Process method to augment it with properties derived
-  /// from the passed-in auth_metadata.
-  /// consumed_auth_metadata needs to be filled with metadata that has been
-  /// consumed by the processor and will be removed from the call.
-  /// response_metadata is the metadata that will be sent as part of the
-  /// response.
-  /// If the return value is not Status::OK, the rpc call will be aborted with
-  /// the error code and error message sent back to the client.
-  virtual Status Process(const InputMetadata& auth_metadata,
-                         AuthContext* context,
-                         OutputMetadata* consumed_auth_metadata,
-                         OutputMetadata* response_metadata) = 0;
-};
-
-}  // namespace grpc
+#include <grpcpp/security/auth_metadata_processor.h>
 
 #endif  // GRPCXX_SECURITY_AUTH_METADATA_PROCESSOR_H
diff --git a/include/grpc++/security/credentials.h b/include/grpc++/security/credentials.h
index 92330d42c6..940441827d 100644
--- a/include/grpc++/security/credentials.h
+++ b/include/grpc++/security/credentials.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,209 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SECURITY_CREDENTIALS_H
 #define GRPCXX_SECURITY_CREDENTIALS_H
 
-#include <map>
-#include <memory>
-
-#include <grpc++/impl/codegen/grpc_library.h>
-#include <grpc++/security/auth_context.h>
-#include <grpc++/support/status.h>
-#include <grpc++/support/string_ref.h>
-
-struct grpc_call;
-
-namespace grpc {
-class ChannelArguments;
-class Channel;
-class SecureChannelCredentials;
-class CallCredentials;
-class SecureCallCredentials;
-
-/// A channel credentials object encapsulates all the state needed by a client
-/// to authenticate with a server for a given channel.
-/// It can make various assertions, e.g., about the client’s identity, role
-/// for all the calls on that channel.
-///
-/// \see https://grpc.io/docs/guides/auth.html
-class ChannelCredentials : private GrpcLibraryCodegen {
- public:
-  ChannelCredentials();
-  ~ChannelCredentials();
-
- protected:
-  friend std::shared_ptr<ChannelCredentials> CompositeChannelCredentials(
-      const std::shared_ptr<ChannelCredentials>& channel_creds,
-      const std::shared_ptr<CallCredentials>& call_creds);
-
-  virtual SecureChannelCredentials* AsSecureCredentials() = 0;
-
- private:
-  friend std::shared_ptr<Channel> CreateCustomChannel(
-      const grpc::string& target,
-      const std::shared_ptr<ChannelCredentials>& creds,
-      const ChannelArguments& args);
-
-  virtual std::shared_ptr<Channel> CreateChannel(
-      const grpc::string& target, const ChannelArguments& args) = 0;
-};
-
-/// A call credentials object encapsulates the state needed by a client to
-/// authenticate with a server for a given call on a channel.
-///
-/// \see https://grpc.io/docs/guides/auth.html
-class CallCredentials : private GrpcLibraryCodegen {
- public:
-  CallCredentials();
-  ~CallCredentials();
-
-  /// Apply this instance's credentials to \a call.
-  virtual bool ApplyToCall(grpc_call* call) = 0;
-
- protected:
-  friend std::shared_ptr<ChannelCredentials> CompositeChannelCredentials(
-      const std::shared_ptr<ChannelCredentials>& channel_creds,
-      const std::shared_ptr<CallCredentials>& call_creds);
-
-  friend std::shared_ptr<CallCredentials> CompositeCallCredentials(
-      const std::shared_ptr<CallCredentials>& creds1,
-      const std::shared_ptr<CallCredentials>& creds2);
-
-  virtual SecureCallCredentials* AsSecureCredentials() = 0;
-};
-
-/// Options used to build SslCredentials.
-struct SslCredentialsOptions {
-  /// The buffer containing the PEM encoding of the server root certificates. If
-  /// this parameter is empty, the default roots will be used.  The default
-  /// roots can be overridden using the \a GRPC_DEFAULT_SSL_ROOTS_FILE_PATH
-  /// environment variable pointing to a file on the file system containing the
-  /// roots.
-  grpc::string pem_root_certs;
-
-  /// The buffer containing the PEM encoding of the client's private key. This
-  /// parameter can be empty if the client does not have a private key.
-  grpc::string pem_private_key;
-
-  /// The buffer containing the PEM encoding of the client's certificate chain.
-  /// This parameter can be empty if the client does not have a certificate
-  /// chain.
-  grpc::string pem_cert_chain;
-};
-
-// Factories for building different types of Credentials The functions may
-// return empty shared_ptr when credentials cannot be created. If a
-// Credentials pointer is returned, it can still be invalid when used to create
-// a channel. A lame channel will be created then and all rpcs will fail on it.
-
-/// Builds credentials with reasonable defaults.
-///
-/// \warning Only use these credentials when connecting to a Google endpoint.
-/// Using these credentials to connect to any other service may result in this
-/// service being able to impersonate your client for requests to Google
-/// services.
-std::shared_ptr<ChannelCredentials> GoogleDefaultCredentials();
-
-/// Builds SSL Credentials given SSL specific options
-std::shared_ptr<ChannelCredentials> SslCredentials(
-    const SslCredentialsOptions& options);
-
-/// Builds credentials for use when running in GCE
-///
-/// \warning Only use these credentials when connecting to a Google endpoint.
-/// Using these credentials to connect to any other service may result in this
-/// service being able to impersonate your client for requests to Google
-/// services.
-std::shared_ptr<CallCredentials> GoogleComputeEngineCredentials();
-
-/// Constant for maximum auth token lifetime.
-constexpr long kMaxAuthTokenLifetimeSecs = 3600;
-
-/// Builds Service Account JWT Access credentials.
-/// json_key is the JSON key string containing the client's private key.
-/// token_lifetime_seconds is the lifetime in seconds of each Json Web Token
-/// (JWT) created with this credentials. It should not exceed
-/// \a kMaxAuthTokenLifetimeSecs or will be cropped to this value.
-std::shared_ptr<CallCredentials> ServiceAccountJWTAccessCredentials(
-    const grpc::string& json_key,
-    long token_lifetime_seconds = kMaxAuthTokenLifetimeSecs);
-
-/// Builds refresh token credentials.
-/// json_refresh_token is the JSON string containing the refresh token along
-/// with a client_id and client_secret.
-///
-/// \warning Only use these credentials when connecting to a Google endpoint.
-/// Using these credentials to connect to any other service may result in this
-/// service being able to impersonate your client for requests to Google
-/// services.
-std::shared_ptr<CallCredentials> GoogleRefreshTokenCredentials(
-    const grpc::string& json_refresh_token);
-
-/// Builds access token credentials.
-/// access_token is an oauth2 access token that was fetched using an out of band
-/// mechanism.
-///
-/// \warning Only use these credentials when connecting to a Google endpoint.
-/// Using these credentials to connect to any other service may result in this
-/// service being able to impersonate your client for requests to Google
-/// services.
-std::shared_ptr<CallCredentials> AccessTokenCredentials(
-    const grpc::string& access_token);
-
-/// Builds IAM credentials.
-///
-/// \warning Only use these credentials when connecting to a Google endpoint.
-/// Using these credentials to connect to any other service may result in this
-/// service being able to impersonate your client for requests to Google
-/// services.
-std::shared_ptr<CallCredentials> GoogleIAMCredentials(
-    const grpc::string& authorization_token,
-    const grpc::string& authority_selector);
-
-/// Combines a channel credentials and a call credentials into a composite
-/// channel credentials.
-std::shared_ptr<ChannelCredentials> CompositeChannelCredentials(
-    const std::shared_ptr<ChannelCredentials>& channel_creds,
-    const std::shared_ptr<CallCredentials>& call_creds);
-
-/// Combines two call credentials objects into a composite call credentials.
-std::shared_ptr<CallCredentials> CompositeCallCredentials(
-    const std::shared_ptr<CallCredentials>& creds1,
-    const std::shared_ptr<CallCredentials>& creds2);
-
-/// Credentials for an unencrypted, unauthenticated channel
-std::shared_ptr<ChannelCredentials> InsecureChannelCredentials();
-
-/// Credentials for a channel using Cronet.
-std::shared_ptr<ChannelCredentials> CronetChannelCredentials(void* engine);
-
-/// User defined metadata credentials.
-class MetadataCredentialsPlugin {
- public:
-  virtual ~MetadataCredentialsPlugin() {}
-
-  /// If this method returns true, the Process function will be scheduled in
-  /// a different thread from the one processing the call.
-  virtual bool IsBlocking() const { return true; }
-
-  /// Type of credentials this plugin is implementing.
-  virtual const char* GetType() const { return ""; }
-
-  /// Gets the auth metatada produced by this plugin.
-  /// The fully qualified method name is:
-  /// service_url + "/" + method_name.
-  /// The channel_auth_context contains (among other things), the identity of
-  /// the server.
-  virtual Status GetMetadata(
-      grpc::string_ref service_url, grpc::string_ref method_name,
-      const AuthContext& channel_auth_context,
-      std::multimap<grpc::string, grpc::string>* metadata) = 0;
-};
-
-std::shared_ptr<CallCredentials> MetadataCredentialsFromPlugin(
-    std::unique_ptr<MetadataCredentialsPlugin> plugin);
-
-}  // namespace grpc
+#include <grpcpp/security/credentials.h>
 
 #endif  // GRPCXX_SECURITY_CREDENTIALS_H
diff --git a/include/grpc++/security/server_credentials.h b/include/grpc++/security/server_credentials.h
index 74a61b51e3..c6d1c4f0e4 100644
--- a/include/grpc++/security/server_credentials.h
+++ b/include/grpc++/security/server_credentials.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,76 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SECURITY_SERVER_CREDENTIALS_H
 #define GRPCXX_SECURITY_SERVER_CREDENTIALS_H
 
-#include <memory>
-#include <vector>
-
-#include <grpc++/security/auth_metadata_processor.h>
-#include <grpc++/support/config.h>
-#include <grpc/grpc_security_constants.h>
-
-struct grpc_server;
-
-namespace grpc {
-class Server;
-
-/// Wrapper around \a grpc_server_credentials, a way to authenticate a server.
-class ServerCredentials {
- public:
-  virtual ~ServerCredentials();
-
-  /// This method is not thread-safe and has to be called before the server is
-  /// started. The last call to this function wins.
-  virtual void SetAuthMetadataProcessor(
-      const std::shared_ptr<AuthMetadataProcessor>& processor) = 0;
-
- private:
-  friend class ::grpc::Server;
-
-  /// Tries to bind \a server to the given \a addr (eg, localhost:1234,
-  /// 192.168.1.1:31416, [::1]:27182, etc.)
-  ///
-  /// \return bound port number on sucess, 0 on failure.
-  // TODO(dgq): the "port" part seems to be a misnomer.
-  virtual int AddPortToServer(const grpc::string& addr,
-                              grpc_server* server) = 0;
-};
-
-/// Options to create ServerCredentials with SSL
-struct SslServerCredentialsOptions {
-  /// \warning Deprecated
-  SslServerCredentialsOptions()
-      : force_client_auth(false),
-        client_certificate_request(GRPC_SSL_DONT_REQUEST_CLIENT_CERTIFICATE) {}
-  SslServerCredentialsOptions(
-      grpc_ssl_client_certificate_request_type request_type)
-      : force_client_auth(false), client_certificate_request(request_type) {}
-
-  struct PemKeyCertPair {
-    grpc::string private_key;
-    grpc::string cert_chain;
-  };
-  grpc::string pem_root_certs;
-  std::vector<PemKeyCertPair> pem_key_cert_pairs;
-  /// \warning Deprecated
-  bool force_client_auth;
-
-  /// If both \a force_client_auth and \a client_certificate_request
-  /// fields are set, \a force_client_auth takes effect, i.e.
-  /// \a REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_AND_VERIFY
-  /// will be enforced.
-  grpc_ssl_client_certificate_request_type client_certificate_request;
-};
-
-/// Builds SSL ServerCredentials given SSL specific options
-std::shared_ptr<ServerCredentials> SslServerCredentials(
-    const SslServerCredentialsOptions& options);
-
-/// Builds insecure server credentials.
-std::shared_ptr<ServerCredentials> InsecureServerCredentials();
-
-}  // namespace grpc
+#include <grpcpp/security/server_credentials.h>
 
 #endif  // GRPCXX_SECURITY_SERVER_CREDENTIALS_H
diff --git a/include/grpc++/server.h b/include/grpc++/server.h
index 01c4a60d21..086c24cc69 100644
--- a/include/grpc++/server.h
+++ b/include/grpc++/server.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,212 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SERVER_H
 #define GRPCXX_SERVER_H
 
-#include <condition_variable>
-#include <list>
-#include <memory>
-#include <mutex>
-#include <vector>
-
-#include <grpc++/completion_queue.h>
-#include <grpc++/impl/call.h>
-#include <grpc++/impl/codegen/grpc_library.h>
-#include <grpc++/impl/codegen/server_interface.h>
-#include <grpc++/impl/rpc_service_method.h>
-#include <grpc++/security/server_credentials.h>
-#include <grpc++/support/channel_arguments.h>
-#include <grpc++/support/config.h>
-#include <grpc++/support/status.h>
-#include <grpc/compression.h>
-
-struct grpc_server;
-
-namespace grpc {
-
-class AsyncGenericService;
-class HealthCheckServiceInterface;
-class ServerContext;
-class ServerInitializer;
-
-/// Represents a gRPC server.
-///
-/// Use a \a grpc::ServerBuilder to create, configure, and start
-/// \a Server instances.
-class Server final : public ServerInterface, private GrpcLibraryCodegen {
- public:
-  ~Server();
-
-  /// Block until the server shuts down.
-  ///
-  /// \warning The server must be either shutting down or some other thread must
-  /// call \a Shutdown for this function to ever return.
-  void Wait() override;
-
-  /// Global callbacks are a set of hooks that are called when server
-  /// events occur.  \a SetGlobalCallbacks method is used to register
-  /// the hooks with gRPC.  Note that
-  /// the \a GlobalCallbacks instance will be shared among all
-  /// \a Server instances in an application and can be set exactly
-  /// once per application.
-  class GlobalCallbacks {
-   public:
-    virtual ~GlobalCallbacks() {}
-    /// Called before server is created.
-    virtual void UpdateArguments(ChannelArguments* args) {}
-    /// Called before application callback for each synchronous server request
-    virtual void PreSynchronousRequest(ServerContext* context) = 0;
-    /// Called after application callback for each synchronous server request
-    virtual void PostSynchronousRequest(ServerContext* context) = 0;
-    /// Called before server is started.
-    virtual void PreServerStart(Server* server) {}
-    /// Called after a server port is added.
-    virtual void AddPort(Server* server, const grpc::string& addr,
-                         ServerCredentials* creds, int port) {}
-  };
-  /// Set the global callback object. Can only be called once per application.
-  /// Does not take ownership of callbacks, and expects the pointed to object
-  /// to be alive until all server objects in the process have been destroyed.
-  /// The same \a GlobalCallbacks object will be used throughout the
-  /// application and is shared among all \a Server objects.
-  static void SetGlobalCallbacks(GlobalCallbacks* callbacks);
-
-  // Returns a \em raw pointer to the underlying \a grpc_server instance.
-  grpc_server* c_server();
-
-  /// Returns the health check service.
-  HealthCheckServiceInterface* GetHealthCheckService() const {
-    return health_check_service_.get();
-  }
-
-  /// Establish a channel for in-process communication
-  std::shared_ptr<Channel> InProcessChannel(const ChannelArguments& args);
-
- private:
-  friend class AsyncGenericService;
-  friend class ServerBuilder;
-  friend class ServerInitializer;
-
-  class SyncRequest;
-  class AsyncRequest;
-  class ShutdownRequest;
-
-  /// SyncRequestThreadManager is an implementation of ThreadManager. This class
-  /// is responsible for polling for incoming RPCs and calling the RPC handlers.
-  /// This is only used in case of a Sync server (i.e a server exposing a sync
-  /// interface)
-  class SyncRequestThreadManager;
-
-  class UnimplementedAsyncRequestContext;
-  class UnimplementedAsyncRequest;
-  class UnimplementedAsyncResponse;
-
-  /// Server constructors. To be used by \a ServerBuilder only.
-  ///
-  /// \param max_message_size Maximum message length that the channel can
-  /// receive.
-  ///
-  /// \param args The channel args
-  ///
-  /// \param sync_server_cqs The completion queues to use if the server is a
-  /// synchronous server (or a hybrid server). The server polls for new RPCs on
-  /// these queues
-  ///
-  /// \param min_pollers The minimum number of polling threads per server
-  /// completion queue (in param sync_server_cqs) to use for listening to
-  /// incoming requests (used only in case of sync server)
-  ///
-  /// \param max_pollers The maximum number of polling threads per server
-  /// completion queue (in param sync_server_cqs) to use for listening to
-  /// incoming requests (used only in case of sync server)
-  ///
-  /// \param sync_cq_timeout_msec The timeout to use when calling AsyncNext() on
-  /// server completion queues passed via sync_server_cqs param.
-  Server(int max_message_size, ChannelArguments* args,
-         std::shared_ptr<std::vector<std::unique_ptr<ServerCompletionQueue>>>
-             sync_server_cqs,
-         int min_pollers, int max_pollers, int sync_cq_timeout_msec);
-
-  /// Register a service. This call does not take ownership of the service.
-  /// The service must exist for the lifetime of the Server instance.
-  bool RegisterService(const grpc::string* host, Service* service) override;
-
-  /// Register a generic service. This call does not take ownership of the
-  /// service. The service must exist for the lifetime of the Server instance.
-  void RegisterAsyncGenericService(AsyncGenericService* service) override;
-
-  /// Try binding the server to the given \a addr endpoint
-  /// (port, and optionally including IP address to bind to).
-  ///
-  /// It can be invoked multiple times. Should be used before
-  /// starting the server.
-  ///
-  /// \param addr The address to try to bind to the server (eg, localhost:1234,
-  /// 192.168.1.1:31416, [::1]:27182, etc.).
-  /// \param creds The credentials associated with the server.
-  ///
-  /// \return bound port number on success, 0 on failure.
-  ///
-  /// \warning It is an error to call this method on an already started server.
-  int AddListeningPort(const grpc::string& addr,
-                       ServerCredentials* creds) override;
-
-  /// Start the server.
-  ///
-  /// \param cqs Completion queues for handling asynchronous services. The
-  /// caller is required to keep all completion queues live until the server is
-  /// destroyed.
-  /// \param num_cqs How many completion queues does \a cqs hold.
-  void Start(ServerCompletionQueue** cqs, size_t num_cqs) override;
-
-  void PerformOpsOnCall(internal::CallOpSetInterface* ops,
-                        internal::Call* call) override;
-
-  void ShutdownInternal(gpr_timespec deadline) override;
-
-  int max_receive_message_size() const override {
-    return max_receive_message_size_;
-  };
-
-  grpc_server* server() override { return server_; };
-
-  ServerInitializer* initializer();
-
-  const int max_receive_message_size_;
-
-  /// The following completion queues are ONLY used in case of Sync API
-  /// i.e. if the server has any services with sync methods. The server uses
-  /// these completion queues to poll for new RPCs
-  std::shared_ptr<std::vector<std::unique_ptr<ServerCompletionQueue>>>
-      sync_server_cqs_;
-
-  /// List of \a ThreadManager instances (one for each cq in
-  /// the \a sync_server_cqs)
-  std::vector<std::unique_ptr<SyncRequestThreadManager>> sync_req_mgrs_;
-
-  // Sever status
-  std::mutex mu_;
-  bool started_;
-  bool shutdown_;
-  bool shutdown_notified_;  // Was notify called on the shutdown_cv_
-
-  std::condition_variable shutdown_cv_;
-
-  std::shared_ptr<GlobalCallbacks> global_callbacks_;
-
-  std::vector<grpc::string> services_;
-  bool has_generic_service_;
-
-  // Pointer to the wrapped grpc_server.
-  grpc_server* server_;
-
-  std::unique_ptr<ServerInitializer> server_initializer_;
-
-  std::unique_ptr<HealthCheckServiceInterface> health_check_service_;
-  bool health_check_service_disabled_;
-};
-
-}  // namespace grpc
+#include <grpcpp/server.h>
 
 #endif  // GRPCXX_SERVER_H
diff --git a/include/grpc++/server_builder.h b/include/grpc++/server_builder.h
index ea9834c179..2c6dab4445 100644
--- a/include/grpc++/server_builder.h
+++ b/include/grpc++/server_builder.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015-2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,263 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SERVER_BUILDER_H
 #define GRPCXX_SERVER_BUILDER_H
 
-#include <climits>
-#include <map>
-#include <memory>
-#include <vector>
-
-#include <grpc++/impl/channel_argument_option.h>
-#include <grpc++/impl/server_builder_option.h>
-#include <grpc++/impl/server_builder_plugin.h>
-#include <grpc++/support/config.h>
-#include <grpc/compression.h>
-#include <grpc/support/cpu.h>
-#include <grpc/support/workaround_list.h>
-
-struct grpc_resource_quota;
-
-namespace grpc {
-
-class AsyncGenericService;
-class ResourceQuota;
-class CompletionQueue;
-class Server;
-class ServerCompletionQueue;
-class ServerCredentials;
-class Service;
-
-namespace testing {
-class ServerBuilderPluginTest;
-}  // namespace testing
-
-/// A builder class for the creation and startup of \a grpc::Server instances.
-class ServerBuilder {
- public:
-  ServerBuilder();
-  ~ServerBuilder();
-
-  //////////////////////////////////////////////////////////////////////////////
-  // Primary API's
-
-  /// Return a running server which is ready for processing calls.
-  /// Before calling, one typically needs to ensure that:
-  ///  1. a service is registered - so that the server knows what to serve
-  ///     (via RegisterService, or RegisterAsyncGenericService)
-  ///  2. a listening port has been added - so the server knows where to receive
-  ///     traffic (via AddListeningPort)
-  ///  3. [for async api only] completion queues have been added via
-  ///     AddCompletionQueue
-  std::unique_ptr<Server> BuildAndStart();
-
-  /// Register a service. This call does not take ownership of the service.
-  /// The service must exist for the lifetime of the \a Server instance returned
-  /// by \a BuildAndStart().
-  /// Matches requests with any :authority
-  ServerBuilder& RegisterService(Service* service);
-
-  /// Enlists an endpoint \a addr (port with an optional IP address) to
-  /// bind the \a grpc::Server object to be created to.
-  ///
-  /// It can be invoked multiple times.
-  ///
-  /// \param addr_uri The address to try to bind to the server in URI form. If
-  /// the scheme name is omitted, "dns:///" is assumed. To bind to any address,
-  /// please use IPv6 any, i.e., [::]:<port>, which also accepts IPv4
-  /// connections.  Valid values include dns:///localhost:1234, /
-  /// 192.168.1.1:31416, dns:///[::1]:27182, etc.).
-  /// \param creds The credentials associated with the server.
-  /// \param selected_port[out] If not `nullptr`, gets populated with the port
-  /// number bound to the \a grpc::Server for the corresponding endpoint after
-  /// it is successfully bound, 0 otherwise.
-  ///
-  ServerBuilder& AddListeningPort(const grpc::string& addr_uri,
-                                  std::shared_ptr<ServerCredentials> creds,
-                                  int* selected_port = nullptr);
-
-  /// Add a completion queue for handling asynchronous services.
-  ///
-  /// Best performance is typically obtained by using one thread per polling
-  /// completion queue.
-  ///
-  /// Caller is required to shutdown the server prior to shutting down the
-  /// returned completion queue. Caller is also required to drain the
-  /// completion queue after shutting it down. A typical usage scenario:
-  ///
-  /// // While building the server:
-  /// ServerBuilder builder;
-  /// ...
-  /// cq_ = builder.AddCompletionQueue();
-  /// server_ = builder.BuildAndStart();
-  ///
-  /// // While shutting down the server;
-  /// server_->Shutdown();
-  /// cq_->Shutdown();  // Always *after* the associated server's Shutdown()!
-  /// // Drain the cq_ that was created
-  /// void* ignored_tag;
-  /// bool ignored_ok;
-  /// while (cq_->Next(&ignored_tag, &ignored_ok)) { }
-  ///
-  /// \param is_frequently_polled This is an optional parameter to inform gRPC
-  /// library about whether this completion queue would be frequently polled
-  /// (i.e. by calling \a Next() or \a AsyncNext()). The default value is
-  /// 'true' and is the recommended setting. Setting this to 'false' (i.e.
-  /// not polling the completion queue frequently) will have a significantly
-  /// negative performance impact and hence should not be used in production
-  /// use cases.
-  std::unique_ptr<ServerCompletionQueue> AddCompletionQueue(
-      bool is_frequently_polled = true);
-
-  //////////////////////////////////////////////////////////////////////////////
-  // Less commonly used RegisterService variants
-
-  /// Register a service. This call does not take ownership of the service.
-  /// The service must exist for the lifetime of the \a Server instance returned
-  /// by \a BuildAndStart().
-  /// Only matches requests with :authority \a host
-  ServerBuilder& RegisterService(const grpc::string& host, Service* service);
-
-  /// Register a generic service.
-  /// Matches requests with any :authority
-  /// This is mostly useful for writing generic gRPC Proxies where the exact
-  /// serialization format is unknown
-  ServerBuilder& RegisterAsyncGenericService(AsyncGenericService* service);
-
-  //////////////////////////////////////////////////////////////////////////////
-  // Fine control knobs
-
-  /// Set max receive message size in bytes.
-  ServerBuilder& SetMaxReceiveMessageSize(int max_receive_message_size) {
-    max_receive_message_size_ = max_receive_message_size;
-    return *this;
-  }
-
-  /// Set max send message size in bytes.
-  ServerBuilder& SetMaxSendMessageSize(int max_send_message_size) {
-    max_send_message_size_ = max_send_message_size;
-    return *this;
-  }
-
-  /// \deprecated For backward compatibility.
-  ServerBuilder& SetMaxMessageSize(int max_message_size) {
-    return SetMaxReceiveMessageSize(max_message_size);
-  }
-
-  /// Set the support status for compression algorithms. All algorithms are
-  /// enabled by default.
-  ///
-  /// Incoming calls compressed with an unsupported algorithm will fail with
-  /// \a GRPC_STATUS_UNIMPLEMENTED.
-  ServerBuilder& SetCompressionAlgorithmSupportStatus(
-      grpc_compression_algorithm algorithm, bool enabled);
-
-  /// The default compression level to use for all channel calls in the
-  /// absence of a call-specific level.
-  ServerBuilder& SetDefaultCompressionLevel(grpc_compression_level level);
-
-  /// The default compression algorithm to use for all channel calls in the
-  /// absence of a call-specific level. Note that it overrides any compression
-  /// level set by \a SetDefaultCompressionLevel.
-  ServerBuilder& SetDefaultCompressionAlgorithm(
-      grpc_compression_algorithm algorithm);
-
-  /// Set the attached buffer pool for this server
-  ServerBuilder& SetResourceQuota(const ResourceQuota& resource_quota);
-
-  ServerBuilder& SetOption(std::unique_ptr<ServerBuilderOption> option);
-
-  /// Options for synchronous servers.
-  enum SyncServerOption {
-    NUM_CQS,         ///< Number of completion queues.
-    MIN_POLLERS,     ///< Minimum number of polling threads.
-    MAX_POLLERS,     ///< Maximum number of polling threads.
-    CQ_TIMEOUT_MSEC  ///< Completion queue timeout in milliseconds.
-  };
-
-  /// Only useful if this is a Synchronous server.
-  ServerBuilder& SetSyncServerOption(SyncServerOption option, int value);
-
-  /// Add a channel argument (an escape hatch to tuning core library parameters
-  /// directly)
-  template <class T>
-  ServerBuilder& AddChannelArgument(const grpc::string& arg, const T& value) {
-    return SetOption(MakeChannelArgumentOption(arg, value));
-  }
-
-  /// For internal use only: Register a ServerBuilderPlugin factory function.
-  static void InternalAddPluginFactory(
-      std::unique_ptr<ServerBuilderPlugin> (*CreatePlugin)());
-
-  /// Enable a server workaround. Do not use unless you know what the workaround
-  /// does. For explanation and detailed descriptions of workarounds, see
-  /// doc/workarounds.md.
-  ServerBuilder& EnableWorkaround(grpc_workaround_list id);
-
- private:
-  friend class ::grpc::testing::ServerBuilderPluginTest;
-
-  struct Port {
-    grpc::string addr;
-    std::shared_ptr<ServerCredentials> creds;
-    int* selected_port;
-  };
-
-  struct SyncServerSettings {
-    SyncServerSettings()
-        : num_cqs(1), min_pollers(1), max_pollers(2), cq_timeout_msec(10000) {}
-
-    /// Number of server completion queues to create to listen to incoming RPCs.
-    int num_cqs;
-
-    /// Minimum number of threads per completion queue that should be listening
-    /// to incoming RPCs.
-    int min_pollers;
-
-    /// Maximum number of threads per completion queue that can be listening to
-    /// incoming RPCs.
-    int max_pollers;
-
-    /// The timeout for server completion queue's AsyncNext call.
-    int cq_timeout_msec;
-  };
-
-  typedef std::unique_ptr<grpc::string> HostString;
-  struct NamedService {
-    explicit NamedService(Service* s) : service(s) {}
-    NamedService(const grpc::string& h, Service* s)
-        : host(new grpc::string(h)), service(s) {}
-    HostString host;
-    Service* service;
-  };
-
-  int max_receive_message_size_;
-  int max_send_message_size_;
-  std::vector<std::unique_ptr<ServerBuilderOption>> options_;
-  std::vector<std::unique_ptr<NamedService>> services_;
-  std::vector<Port> ports_;
-
-  SyncServerSettings sync_server_settings_;
-
-  /// List of completion queues added via \a AddCompletionQueue method.
-  std::vector<ServerCompletionQueue*> cqs_;
-
-  std::shared_ptr<ServerCredentials> creds_;
-  std::vector<std::unique_ptr<ServerBuilderPlugin>> plugins_;
-  grpc_resource_quota* resource_quota_;
-  AsyncGenericService* generic_service_;
-  struct {
-    bool is_set;
-    grpc_compression_level level;
-  } maybe_default_compression_level_;
-  struct {
-    bool is_set;
-    grpc_compression_algorithm algorithm;
-  } maybe_default_compression_algorithm_;
-  uint32_t enabled_compression_algorithms_bitset_;
-};
-
-}  // namespace grpc
+#include <grpcpp/server_builder.h>
 
 #endif  // GRPCXX_SERVER_BUILDER_H
diff --git a/include/grpc++/server_context.h b/include/grpc++/server_context.h
index f9b98e1896..672ccdca6d 100644
--- a/include/grpc++/server_context.h
+++ b/include/grpc++/server_context.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SERVER_CONTEXT_H
 #define GRPCXX_SERVER_CONTEXT_H
 
-#include <grpc++/impl/codegen/server_context.h>
+#include <grpcpp/server_context.h>
 
 #endif  // GRPCXX_SERVER_CONTEXT_H
diff --git a/include/grpc++/server_posix.h b/include/grpc++/server_posix.h
index 6cafcff540..d2866d9640 100644
--- a/include/grpc++/server_posix.h
+++ b/include/grpc++/server_posix.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,27 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SERVER_POSIX_H
 #define GRPCXX_SERVER_POSIX_H
 
-#include <memory>
-
-#include <grpc++/server.h>
-#include <grpc/support/port_platform.h>
-
-namespace grpc {
-
-#ifdef GPR_SUPPORT_CHANNELS_FROM_FD
-
-/// Add a new client to a \a Server communicating over the given
-/// file descriptor.
-///
-/// \param server The server to add the client to.
-/// \param fd The file descriptor representing a socket.
-void AddInsecureChannelFromFd(Server* server, int fd);
-
-#endif  // GPR_SUPPORT_CHANNELS_FROM_FD
-
-}  // namespace grpc
+#include <grpcpp/server_posix.h>
 
 #endif  // GRPCXX_SERVER_POSIX_H
diff --git a/include/grpc++/support/async_stream.h b/include/grpc++/support/async_stream.h
index f2cab848f0..9bb2b725c3 100644
--- a/include/grpc++/support/async_stream.h
+++ b/include/grpc++/support/async_stream.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_ASYNC_STREAM_H
 #define GRPCXX_SUPPORT_ASYNC_STREAM_H
 
-#include <grpc++/impl/codegen/async_stream.h>
+#include <grpcpp/support/async_stream.h>
 
 #endif  // GRPCXX_SUPPORT_ASYNC_STREAM_H
diff --git a/include/grpc++/support/async_unary_call.h b/include/grpc++/support/async_unary_call.h
index 4947c442a9..56fbf31417 100644
--- a/include/grpc++/support/async_unary_call.h
+++ b/include/grpc++/support/async_unary_call.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_ASYNC_UNARY_CALL_H
 #define GRPCXX_SUPPORT_ASYNC_UNARY_CALL_H
 
-#include <grpc++/impl/codegen/async_unary_call.h>
+#include <grpcpp/support/async_unary_call.h>
 
 #endif  // GRPCXX_SUPPORT_ASYNC_UNARY_CALL_H
diff --git a/include/grpc++/support/byte_buffer.h b/include/grpc++/support/byte_buffer.h
index 81fa3b0a18..ec607ee01a 100644
--- a/include/grpc++/support/byte_buffer.h
+++ b/include/grpc++/support/byte_buffer.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,16 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_BYTE_BUFFER_H
 #define GRPCXX_SUPPORT_BYTE_BUFFER_H
 
-#include <grpc++/impl/codegen/byte_buffer.h>
-#include <grpc++/impl/serialization_traits.h>
-#include <grpc++/support/config.h>
-#include <grpc++/support/slice.h>
-#include <grpc++/support/status.h>
-#include <grpc/byte_buffer.h>
-#include <grpc/grpc.h>
-#include <grpc/support/log.h>
+#include <grpcpp/support/byte_buffer.h>
 
 #endif  // GRPCXX_SUPPORT_BYTE_BUFFER_H
diff --git a/include/grpc++/support/channel_arguments.h b/include/grpc++/support/channel_arguments.h
index c9879d8a28..6d5300ccb7 100644
--- a/include/grpc++/support/channel_arguments.h
+++ b/include/grpc++/support/channel_arguments.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,127 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_CHANNEL_ARGUMENTS_H
 #define GRPCXX_SUPPORT_CHANNEL_ARGUMENTS_H
 
-#include <list>
-#include <vector>
-
-#include <grpc++/support/config.h>
-#include <grpc/compression.h>
-#include <grpc/grpc.h>
-
-namespace grpc {
-namespace testing {
-class ChannelArgumentsTest;
-}  // namespace testing
-
-class ResourceQuota;
-
-/// Options for channel creation. The user can use generic setters to pass
-/// key value pairs down to C channel creation code. For gRPC related options,
-/// concrete setters are provided.
-class ChannelArguments {
- public:
-  ChannelArguments();
-  ~ChannelArguments();
-
-  ChannelArguments(const ChannelArguments& other);
-  ChannelArguments& operator=(ChannelArguments other) {
-    Swap(other);
-    return *this;
-  }
-
-  void Swap(ChannelArguments& other);
-
-  /// Dump arguments in this instance to \a channel_args. Does not take
-  /// ownership of \a channel_args.
-  ///
-  /// Note that the underlying arguments are shared. Changes made to either \a
-  /// channel_args or this instance would be reflected on both.
-  void SetChannelArgs(grpc_channel_args* channel_args) const;
-
-  // gRPC specific channel argument setters
-  /// Set target name override for SSL host name checking. This option is for
-  /// testing only and should never be used in production.
-  void SetSslTargetNameOverride(const grpc::string& name);
-  // TODO(yangg) add flow control options
-  /// Set the compression algorithm for the channel.
-  void SetCompressionAlgorithm(grpc_compression_algorithm algorithm);
-
-  /// Set the grpclb fallback timeout (in ms) for the channel. If this amount
-  /// of time has passed but we have not gotten any non-empty \a serverlist from
-  /// the balancer, we will fall back to use the backend address(es) returned by
-  /// the resolver.
-  void SetGrpclbFallbackTimeout(int fallback_timeout);
-
-  /// Set the socket mutator for the channel.
-  void SetSocketMutator(grpc_socket_mutator* mutator);
-
-  /// Set the string to prepend to the user agent.
-  void SetUserAgentPrefix(const grpc::string& user_agent_prefix);
-
-  /// Set the buffer pool to be attached to the constructed channel.
-  void SetResourceQuota(const ResourceQuota& resource_quota);
-
-  /// Set the max receive and send message sizes.
-  void SetMaxReceiveMessageSize(int size);
-  void SetMaxSendMessageSize(int size);
-
-  /// Set LB policy name.
-  /// Note that if the name resolver returns only balancer addresses, the
-  /// grpclb LB policy will be used, regardless of what is specified here.
-  void SetLoadBalancingPolicyName(const grpc::string& lb_policy_name);
-
-  /// Set service config in JSON form.
-  /// Primarily meant for use in unit tests.
-  void SetServiceConfigJSON(const grpc::string& service_config_json);
-
-  // Generic channel argument setters. Only for advanced use cases.
-  /// Set an integer argument \a value under \a key.
-  void SetInt(const grpc::string& key, int value);
-
-  // Generic channel argument setter. Only for advanced use cases.
-  /// Set a pointer argument \a value under \a key. Owership is not transferred.
-  void SetPointer(const grpc::string& key, void* value);
-
-  void SetPointerWithVtable(const grpc::string& key, void* value,
-                            const grpc_arg_pointer_vtable* vtable);
-
-  /// Set a textual argument \a value under \a key.
-  void SetString(const grpc::string& key, const grpc::string& value);
-
-  /// Return (by value) a C \a grpc_channel_args structure which points to
-  /// arguments owned by this \a ChannelArguments instance
-  grpc_channel_args c_channel_args() const {
-    grpc_channel_args out;
-    out.num_args = args_.size();
-    out.args = args_.empty() ? NULL : const_cast<grpc_arg*>(&args_[0]);
-    return out;
-  }
-
- private:
-  friend class SecureChannelCredentials;
-  friend class testing::ChannelArgumentsTest;
-
-  /// Default pointer argument operations.
-  struct PointerVtableMembers {
-    static void* Copy(void* in) { return in; }
-    static void Destroy(void* in) {}
-    static int Compare(void* a, void* b) {
-      if (a < b) return -1;
-      if (a > b) return 1;
-      return 0;
-    }
-  };
-
-  // Returns empty string when it is not set.
-  grpc::string GetSslTargetNameOverride() const;
-
-  std::vector<grpc_arg> args_;
-  std::list<grpc::string> strings_;
-};
-
-}  // namespace grpc
+#include <grpcpp/support/channel_arguments.h>
 
 #endif  // GRPCXX_SUPPORT_CHANNEL_ARGUMENTS_H
diff --git a/include/grpc++/support/config.h b/include/grpc++/support/config.h
index b65af3121b..f8eee5075a 100644
--- a/include/grpc++/support/config.h
+++ b/include/grpc++/support/config.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_CONFIG_H
 #define GRPCXX_SUPPORT_CONFIG_H
 
-#include <grpc++/impl/codegen/config.h>
+#include <grpcpp/support/config.h>
 
 #endif  // GRPCXX_SUPPORT_CONFIG_H
diff --git a/include/grpc++/support/error_details.h b/include/grpc++/support/error_details.h
index 8925fa843a..7ace308e52 100644
--- a/include/grpc++/support/error_details.h
+++ b/include/grpc++/support/error_details.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2017 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,31 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_ERROR_DETAILS_H
 #define GRPCXX_SUPPORT_ERROR_DETAILS_H
 
-#include <grpc++/support/status.h>
-
-namespace google {
-namespace rpc {
-class Status;
-}  // namespace rpc
-}  // namespace google
-
-namespace grpc {
-
-/// Map a \a grpc::Status to a \a google::rpc::Status.
-/// The given \a to object will be cleared.
-/// On success, returns status with OK.
-/// Returns status with \a INVALID_ARGUMENT, if failed to deserialize.
-/// Returns status with \a FAILED_PRECONDITION, if \a to is nullptr.
-Status ExtractErrorDetails(const Status& from, ::google::rpc::Status* to);
-
-/// Map \a google::rpc::Status to a \a grpc::Status.
-/// Returns OK on success.
-/// Returns status with \a FAILED_PRECONDITION if \a to is nullptr.
-Status SetErrorDetails(const ::google::rpc::Status& from, Status* to);
-
-}  // namespace grpc
+#include <grpcpp/support/error_details.h>
 
 #endif  // GRPCXX_SUPPORT_ERROR_DETAILS_H
diff --git a/include/grpc++/support/slice.h b/include/grpc++/support/slice.h
index 10db10d79c..b02b1a977e 100644
--- a/include/grpc++/support/slice.h
+++ b/include/grpc++/support/slice.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,11 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_SLICE_H
 #define GRPCXX_SUPPORT_SLICE_H
 
-#include <grpc++/impl/codegen/slice.h>
-#include <grpc++/support/config.h>
-#include <grpc/slice.h>
+#include <grpcpp/support/slice.h>
 
 #endif  // GRPCXX_SUPPORT_SLICE_H
diff --git a/include/grpc++/support/status.h b/include/grpc++/support/status.h
index 1fa910a68c..e58a18bdf9 100644
--- a/include/grpc++/support/status.h
+++ b/include/grpc++/support/status.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_STATUS_H
 #define GRPCXX_SUPPORT_STATUS_H
 
-#include <grpc++/impl/codegen/status.h>
+#include <grpcpp/support/status.h>
 
 #endif  // GRPCXX_SUPPORT_STATUS_H
diff --git a/include/grpc++/support/status_code_enum.h b/include/grpc++/support/status_code_enum.h
index d320c0cf10..c278add0c6 100644
--- a/include/grpc++/support/status_code_enum.h
+++ b/include/grpc++/support/status_code_enum.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_STATUS_CODE_ENUM_H
 #define GRPCXX_SUPPORT_STATUS_CODE_ENUM_H
 
-#include <grpc++/impl/codegen/status_code_enum.h>
+#include <grpcpp/support/status_code_enum.h>
 
 #endif  // GRPCXX_SUPPORT_STATUS_CODE_ENUM_H
diff --git a/include/grpc++/support/string_ref.h b/include/grpc++/support/string_ref.h
index 873be63cee..49de6dafce 100644
--- a/include/grpc++/support/string_ref.h
+++ b/include/grpc++/support/string_ref.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_STRING_REF_H
 #define GRPCXX_SUPPORT_STRING_REF_H
 
-#include <grpc++/impl/codegen/string_ref.h>
+#include <grpcpp/support/string_ref.h>
 
 #endif  // GRPCXX_SUPPORT_STRING_REF_H
diff --git a/include/grpc++/support/stub_options.h b/include/grpc++/support/stub_options.h
index 87843cf34f..a712ce8716 100644
--- a/include/grpc++/support/stub_options.h
+++ b/include/grpc++/support/stub_options.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_STUB_OPTIONS_H
 #define GRPCXX_SUPPORT_STUB_OPTIONS_H
 
-#include <grpc++/impl/codegen/stub_options.h>
+#include <grpcpp/support/stub_options.h>
 
 #endif  // GRPCXX_SUPPORT_STUB_OPTIONS_H
diff --git a/include/grpc++/support/sync_stream.h b/include/grpc++/support/sync_stream.h
index 6a6e0c797f..c118df9f7b 100644
--- a/include/grpc++/support/sync_stream.h
+++ b/include/grpc++/support/sync_stream.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_SYNC_STREAM_H
 #define GRPCXX_SUPPORT_SYNC_STREAM_H
 
-#include <grpc++/impl/codegen/sync_stream.h>
+#include <grpcpp/support/sync_stream.h>
 
 #endif  // GRPCXX_SUPPORT_SYNC_STREAM_H
diff --git a/include/grpc++/support/time.h b/include/grpc++/support/time.h
index e47a593ac9..d356b91001 100644
--- a/include/grpc++/support/time.h
+++ b/include/grpc++/support/time.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_SUPPORT_TIME_H
 #define GRPCXX_SUPPORT_TIME_H
 
-#include <grpc++/impl/codegen/time.h>
+#include <grpcpp/support/time.h>
 
 #endif  // GRPCXX_SUPPORT_TIME_H
diff --git a/include/grpc++/test/mock_stream.h b/include/grpc++/test/mock_stream.h
index f8f78244f5..a29345b061 100644
--- a/include/grpc++/test/mock_stream.h
+++ b/include/grpc++/test/mock_stream.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2017 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,133 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_TEST_MOCK_STREAM_H
 #define GRPCXX_TEST_MOCK_STREAM_H
 
-#include <stdint.h>
-
-#include <gmock/gmock.h>
-#include <grpc++/impl/codegen/call.h>
-#include <grpc++/support/async_stream.h>
-#include <grpc++/support/async_unary_call.h>
-#include <grpc++/support/sync_stream.h>
-
-namespace grpc {
-namespace testing {
-
-template <class R>
-class MockClientReader : public ClientReaderInterface<R> {
- public:
-  MockClientReader() = default;
-
-  /// ClientStreamingInterface
-  MOCK_METHOD0_T(Finish, Status());
-
-  /// ReaderInterface
-  MOCK_METHOD1_T(NextMessageSize, bool(uint32_t*));
-  MOCK_METHOD1_T(Read, bool(R*));
-
-  /// ClientReaderInterface
-  MOCK_METHOD0_T(WaitForInitialMetadata, void());
-};
-
-template <class W>
-class MockClientWriter : public ClientWriterInterface<W> {
- public:
-  MockClientWriter() = default;
-
-  /// ClientStreamingInterface
-  MOCK_METHOD0_T(Finish, Status());
-
-  /// WriterInterface
-  MOCK_METHOD2_T(Write, bool(const W&, const WriteOptions));
-
-  /// ClientWriterInterface
-  MOCK_METHOD0_T(WritesDone, bool());
-};
-
-template <class W, class R>
-class MockClientReaderWriter : public ClientReaderWriterInterface<W, R> {
- public:
-  MockClientReaderWriter() = default;
-
-  /// ClientStreamingInterface
-  MOCK_METHOD0_T(Finish, Status());
-
-  /// ReaderInterface
-  MOCK_METHOD1_T(NextMessageSize, bool(uint32_t*));
-  MOCK_METHOD1_T(Read, bool(R*));
-
-  /// WriterInterface
-  MOCK_METHOD2_T(Write, bool(const W&, const WriteOptions));
-
-  /// ClientReaderWriterInterface
-  MOCK_METHOD0_T(WaitForInitialMetadata, void());
-  MOCK_METHOD0_T(WritesDone, bool());
-};
-
-/// TODO: We do not support mocking an async RPC for now.
-
-template <class R>
-class MockClientAsyncResponseReader
-    : public ClientAsyncResponseReaderInterface<R> {
- public:
-  MockClientAsyncResponseReader() = default;
-
-  MOCK_METHOD1_T(ReadInitialMetadata, void(void*));
-  MOCK_METHOD3_T(Finish, void(R*, Status*, void*));
-};
-
-template <class R>
-class MockClientAsyncReader : public ClientAsyncReaderInterface<R> {
- public:
-  MockClientAsyncReader() = default;
-
-  /// ClientAsyncStreamingInterface
-  MOCK_METHOD1_T(ReadInitialMetadata, void(void*));
-  MOCK_METHOD2_T(Finish, void(Status*, void*));
-
-  /// AsyncReaderInterface
-  MOCK_METHOD2_T(Read, void(R*, void*));
-};
-
-template <class W>
-class MockClientAsyncWriter : public ClientAsyncWriterInterface<W> {
- public:
-  MockClientAsyncWriter() = default;
-
-  /// ClientAsyncStreamingInterface
-  MOCK_METHOD1_T(ReadInitialMetadata, void(void*));
-  MOCK_METHOD2_T(Finish, void(Status*, void*));
-
-  /// AsyncWriterInterface
-  MOCK_METHOD2_T(Write, void(const W&, void*));
-
-  /// ClientAsyncWriterInterface
-  MOCK_METHOD1_T(WritesDone, void(void*));
-};
-
-template <class W, class R>
-class MockClientAsyncReaderWriter
-    : public ClientAsyncReaderWriterInterface<W, R> {
- public:
-  MockClientAsyncReaderWriter() = default;
-
-  /// ClientAsyncStreamingInterface
-  MOCK_METHOD1_T(ReadInitialMetadata, void(void*));
-  MOCK_METHOD2_T(Finish, void(Status*, void*));
-
-  /// AsyncWriterInterface
-  MOCK_METHOD2_T(Write, void(const W&, void*));
-
-  /// AsyncReaderInterface
-  MOCK_METHOD2_T(Read, void(R*, void*));
-
-  /// ClientAsyncReaderWriterInterface
-  MOCK_METHOD1_T(WritesDone, void(void*));
-};
-
-}  // namespace testing
-}  // namespace grpc
+#include <grpcpp/test/mock_stream.h>
 
 #endif  // GRPCXX_TEST_MOCK_STREAM_H
diff --git a/include/grpc++/test/server_context_test_spouse.h b/include/grpc++/test/server_context_test_spouse.h
index b1a7f87009..48a4838c2d 100644
--- a/include/grpc++/test/server_context_test_spouse.h
+++ b/include/grpc++/test/server_context_test_spouse.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2016 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,50 +16,13 @@
  *
  */
 
+// DEPRECATED: The headers in include/grpc++ are deprecated. Please include the
+// headers in include/grpcpp instead. This header exists only for backwards
+// compatibility.
+
 #ifndef GRPCXX_TEST_SERVER_CONTEXT_TEST_SPOUSE_H
 #define GRPCXX_TEST_SERVER_CONTEXT_TEST_SPOUSE_H
 
-#include <map>
-
-#include <grpc++/server_context.h>
-
-namespace grpc {
-namespace testing {
-
-/// A test-only class to access private members and methods of ServerContext.
-class ServerContextTestSpouse {
- public:
-  explicit ServerContextTestSpouse(ServerContext* ctx) : ctx_(ctx) {}
-
-  /// Inject client metadata to the ServerContext for the test. The test spouse
-  /// must be alive when \a ServerContext::client_metadata is called.
-  void AddClientMetadata(const grpc::string& key, const grpc::string& value) {
-    client_metadata_storage_.insert(
-        std::pair<grpc::string, grpc::string>(key, value));
-    ctx_->client_metadata_.map()->clear();
-    for (auto iter = client_metadata_storage_.begin();
-         iter != client_metadata_storage_.end(); ++iter) {
-      ctx_->client_metadata_.map()->insert(
-          std::pair<grpc::string_ref, grpc::string_ref>(
-              iter->first.c_str(),
-              grpc::string_ref(iter->second.data(), iter->second.size())));
-    }
-  }
-
-  std::multimap<grpc::string, grpc::string> GetInitialMetadata() const {
-    return ctx_->initial_metadata_;
-  }
-
-  std::multimap<grpc::string, grpc::string> GetTrailingMetadata() const {
-    return ctx_->trailing_metadata_;
-  }
-
- private:
-  ServerContext* ctx_;  // not owned
-  std::multimap<grpc::string, grpc::string> client_metadata_storage_;
-};
-
-}  // namespace testing
-}  // namespace grpc
+#include <grpcpp/test/server_context_test_spouse.h>
 
 #endif  // GRPCXX_TEST_SERVER_CONTEXT_TEST_SPOUSE_H