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diff --git a/third_party/protobuf/3.6.0/python/google/protobuf/pyext/repeated_composite_container.h b/third_party/protobuf/3.6.0/python/google/protobuf/pyext/repeated_composite_container.h
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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.
+
+// Author: anuraag@google.com (Anuraag Agrawal)
+// Author: tibell@google.com (Johan Tibell)
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_REPEATED_COMPOSITE_CONTAINER_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_REPEATED_COMPOSITE_CONTAINER_H__
+
+#include <Python.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <google/protobuf/pyext/message.h>
+
+namespace google {
+namespace protobuf {
+
+class FieldDescriptor;
+class Message;
+
+namespace python {
+
+struct CMessageClass;
+
+// A RepeatedCompositeContainer can be in one of two states: attached
+// or released.
+//
+// When in the attached state all modifications to the container are
+// done both on the 'message' and on the 'child_messages'
+// list.  In this state all Messages referred to by the children in
+// 'child_messages' are owner by the 'owner'.
+//
+// When in the released state 'message', 'owner', 'parent', and
+// 'parent_field_descriptor' are NULL.
+typedef struct RepeatedCompositeContainer {
+  PyObject_HEAD;
+
+  // This is the top-level C++ Message object that owns the whole
+  // proto tree.  Every Python RepeatedCompositeContainer 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.
+  CMessage::OwnerRef owner;
+
+  // Weak reference to parent object. May be NULL. Used to make sure
+  // the parent is writable before modifying the
+  // RepeatedCompositeContainer.
+  CMessage* parent;
+
+  // A descriptor used to modify the underlying 'message'.
+  // The pointer is owned by the global DescriptorPool.
+  const FieldDescriptor* parent_field_descriptor;
+
+  // Pointer to the C++ Message that contains this container.  The
+  // RepeatedCompositeContainer does not own this pointer.
+  //
+  // If NULL, this message has been released from its parent (by
+  // calling Clear() or ClearField() on the parent.
+  Message* message;
+
+  // The type used to create new child messages.
+  CMessageClass* child_message_class;
+
+  // A list of child messages.
+  PyObject* child_messages;
+} RepeatedCompositeContainer;
+
+extern PyTypeObject RepeatedCompositeContainer_Type;
+
+namespace repeated_composite_container {
+
+// Builds a RepeatedCompositeContainer object, from a parent message and a
+// field descriptor.
+PyObject *NewContainer(
+    CMessage* parent,
+    const FieldDescriptor* parent_field_descriptor,
+    CMessageClass *child_message_class);
+
+// Appends a new CMessage to the container and returns it.  The
+// CMessage is initialized using the content of kwargs.
+//
+// Returns a new reference if successful; returns NULL and sets an
+// exception if unsuccessful.
+PyObject* Add(RepeatedCompositeContainer* self,
+              PyObject* args,
+              PyObject* kwargs);
+
+// Appends all the CMessages in the input iterator to the container.
+//
+// Returns None if successful; returns NULL and sets an exception if
+// unsuccessful.
+PyObject* Extend(RepeatedCompositeContainer* self, PyObject* value);
+
+// Appends a new message to the container for each message in the
+// input iterator, merging each data element in. Equivalent to extend.
+//
+// Returns None if successful; returns NULL and sets an exception if
+// unsuccessful.
+PyObject* MergeFrom(RepeatedCompositeContainer* self, PyObject* other);
+
+// Accesses messages in the container.
+//
+// Returns a new reference to the message for an integer parameter.
+// Returns a new reference to a list of messages for a slice.
+PyObject* Subscript(RepeatedCompositeContainer* self, PyObject* slice);
+
+// Deletes items from the container (cannot be used for assignment).
+//
+// Returns 0 on success, -1 on failure.
+int AssignSubscript(RepeatedCompositeContainer* self,
+                    PyObject* slice,
+                    PyObject* value);
+
+// Releases the messages in the container to a new message.
+//
+// Returns 0 on success, -1 on failure.
+int Release(RepeatedCompositeContainer* self);
+
+// Returns 0 on success, -1 on failure.
+int SetOwner(RepeatedCompositeContainer* self,
+             const CMessage::OwnerRef& new_owner);
+
+// Removes the last element of the repeated message field 'field' on
+// the Message 'parent', and transfers the ownership of the released
+// Message to 'target'.
+//
+// Corresponds to reflection api method ReleaseMessage.
+void ReleaseLastTo(CMessage* parent,
+                   const FieldDescriptor* field,
+                   CMessage* target);
+
+}  // namespace repeated_composite_container
+}  // namespace python
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_REPEATED_COMPOSITE_CONTAINER_H__