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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_MAP_CONTAINER_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_MAP_CONTAINER_H__
+
+#include <Python.h>
+
+#include <memory>
+#ifndef _SHARED_PTR_H
+#include <google/protobuf/stubs/shared_ptr.h>
+#endif
+
+#include <google/protobuf/descriptor.h>
+
+namespace google {
+namespace protobuf {
+
+class Message;
+
+using internal::shared_ptr;
+
+namespace python {
+
+struct CMessage;
+
+struct MessageMapContainer {
+  PyObject_HEAD;
+
+  // This is the top-level C++ Message object that owns the whole
+  // proto tree.  Every Python MessageMapContainer holds a
+  // reference to it in order to keep it alive as long as there's a
+  // Python object that references any part of the tree.
+  shared_ptr<Message> owner;
+
+  // Pointer to the C++ Message that contains this container.  The
+  // MessageMapContainer does not own this pointer.
+  Message* message;
+
+  // Weak reference to a parent CMessage object (i.e. may be NULL.)
+  //
+  // Used to make sure all ancestors are also mutable when first
+  // modifying the container.
+  CMessage* parent;
+
+  // Pointer to the parent's descriptor that describes this
+  // field.  Used together with the parent's message when making a
+  // default message instance mutable.
+  // The pointer is owned by the global DescriptorPool.
+  const FieldDescriptor* parent_field_descriptor;
+  const FieldDescriptor* key_field_descriptor;
+  const FieldDescriptor* value_field_descriptor;
+
+  // A callable that is used to create new child messages.
+  PyObject* subclass_init;
+
+  // A dict mapping Message* -> CMessage.
+  PyObject* message_dict;
+
+  // We bump this whenever we perform a mutation, to invalidate existing
+  // iterators.
+  uint64 version;
+};
+
+extern PyTypeObject MessageMapContainer_Type;
+extern PyTypeObject MessageMapIterator_Type;
+
+namespace message_map_container {
+
+// Builds a MessageMapContainer object, from a parent message and a
+// field descriptor.
+extern PyObject* NewContainer(CMessage* parent,
+                              const FieldDescriptor* parent_field_descriptor,
+                              PyObject* concrete_class);
+
+// Releases the messages in the container to a new message.
+//
+// Returns 0 on success, -1 on failure.
+int Release(MessageMapContainer* self);
+
+// Set the owner field of self and any children of self.
+void SetOwner(MessageMapContainer* self,
+              const shared_ptr<Message>& new_owner);
+
+}  // namespace message_map_container
+}  // namespace python
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_MAP_CONTAINER_H__