Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/python/google/protobuf/pyext/repeated_composite_container.h

-// 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>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
-#include <string>
-#include <vector>
-
-namespace google {
-namespace protobuf {
-
-class FieldDescriptor;
-class Message;
-
-using internal::shared_ptr;
-
-namespace python {
-
-struct CMessage;
-
-// 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.
-  shared_ptr<Message> 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;
-
-  // A callable that is used to create new child messages.
-  PyObject* subclass_init;
-
-  // 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,
-    PyObject *concrete_class);
-
-// Returns the number of items in this repeated composite container.
-static Py_ssize_t Length(RepeatedCompositeContainer* self);
-
-// 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 the given message.
-//
-// Returns 0 on success, -1 on failure.
-int ReleaseToMessage(RepeatedCompositeContainer* self, Message* new_message);
-
-// 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 shared_ptr<Message>& 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__