Add CopyOnWriteBuffer class

webrtc/base/copyonwritebuffer.cc

+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/base/copyonwritebuffer.h"
+
+namespace rtc {
+
+CopyOnWriteBuffer::CopyOnWriteBuffer() {}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(const CopyOnWriteBuffer& buf)
+    : buffer_(buf.buffer_) {
+}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(CopyOnWriteBuffer&& buf)
+    : buffer_(std::move(buf.buffer_)) {

[kwiberg-webrtc, 2016/02/19 12:36:20]

Same comment here as for the move assignment operator.

[joachim, 2016/02/19 20:37:42]

Done.

+}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(size_t size)
+    : buffer_(new RefCountedObject<Buffer>(size)) {
+}
+
+CopyOnWriteBuffer::CopyOnWriteBuffer(size_t size, size_t capacity)
+    : buffer_(new RefCountedObject<Buffer>(size, capacity)) {
+}
+
+CopyOnWriteBuffer::~CopyOnWriteBuffer() = default;
+
+}  // namespace rtc