Line data    Source code

       1             : /*
       2             :  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #ifndef WEBRTC_BASE_KEEP_REF_UNTIL_DONE_H_
      12             : #define WEBRTC_BASE_KEEP_REF_UNTIL_DONE_H_
      13             : 
      14             : #include "webrtc/base/bind.h"
      15             : #include "webrtc/base/callback.h"
      16             : #include "webrtc/base/refcount.h"
      17             : #include "webrtc/base/scoped_ref_ptr.h"
      18             : 
      19             : namespace rtc {
      20             : 
      21             : namespace impl {
      22             : template <class T>
      23           0 : static inline void DoNothing(const scoped_refptr<T>& object) {}
      24             : }  // namespace impl
      25             : 
      26             : // KeepRefUntilDone keeps a reference to |object| until the returned
      27             : // callback goes out of scope. If the returned callback is copied, the
      28             : // reference will be released when the last callback goes out of scope.
      29             : template <class ObjectT>
      30           0 : static inline Callback0<void> KeepRefUntilDone(ObjectT* object) {
      31           0 :   return rtc::Bind(&impl::DoNothing<ObjectT>, scoped_refptr<ObjectT>(object));
      32             : }
      33             : 
      34             : template <class ObjectT>
      35             : static inline Callback0<void> KeepRefUntilDone(
      36             :     const scoped_refptr<ObjectT>& object) {
      37             :   return rtc::Bind(&impl::DoNothing<ObjectT>, object);
      38             : }
      39             : 
      40             : }  // namespace rtc
      41             : 
      42             : 
      43             : #endif  // WEBRTC_BASE_KEEP_REF_UNTIL_DONE_H_