RTCStatsReport: Take ownership of other's stats with TakeMembersFrom

webrtc/stats/rtcstatsreport.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.
  */
 
@@ skipping 48 matching lines @@
 }
 
 RTCStatsReport::~RTCStatsReport() {
 }
 
 bool RTCStatsReport::AddStats(std::unique_ptr<const RTCStats> stats) {
   return !stats_.insert(std::make_pair(std::string(stats->id()),
                         std::move(stats))).second;
 }
 
-const RTCStats* RTCStatsReport::operator[](const std::string& id) const {
+const RTCStats* RTCStatsReport::Get(const std::string& id) const {
   StatsMap::const_iterator it = stats_.find(id);
   if (it != stats_.cend())
     return it->second.get();
   return nullptr;
 }
 
+void RTCStatsReport::TakeMembersFrom(
+    rtc::scoped_refptr<RTCStatsReport> victim) {
+  for (StatsMap::iterator it = victim->stats_.begin();
+       it != victim->stats_.end(); ++it) {
+    AddStats(std::unique_ptr<const RTCStats>(it->second.release()));
+  }
+  victim->stats_.clear();
+}
+
 RTCStatsReport::ConstIterator RTCStatsReport::begin() const {
   return ConstIterator(rtc::scoped_refptr<const RTCStatsReport>(this),
                        stats_.cbegin());
 }
 
 RTCStatsReport::ConstIterator RTCStatsReport::end() const {
   return ConstIterator(rtc::scoped_refptr<const RTCStatsReport>(this),
                        stats_.cend());
 }
 
 }  // namespace webrtc