1 /*
2  *  Copyright (c) 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_AUDIO_SCOPED_VOE_INTERFACE_H_
12 #define WEBRTC_AUDIO_SCOPED_VOE_INTERFACE_H_
13 
14 #include "webrtc/base/checks.h"
15 
16 namespace webrtc {
17 
18 class VoiceEngine;
19 
20 namespace internal {
21 
22 // Utility template for obtaining and holding a reference to a VoiceEngine
23 // interface and making sure it is released when this object goes out of scope.
24 template<class T> class ScopedVoEInterface {
25  public:
ScopedVoEInterface(webrtc::VoiceEngine * e)26   explicit ScopedVoEInterface(webrtc::VoiceEngine* e)
27       : ptr_(T::GetInterface(e)) {
28     RTC_DCHECK(ptr_);
29   }
~ScopedVoEInterface()30   ~ScopedVoEInterface() {
31     if (ptr_) {
32       ptr_->Release();
33     }
34   }
35   T* operator->() {
36     RTC_DCHECK(ptr_);
37     return ptr_;
38   }
39  private:
40   T* ptr_;
41 };
42 }  // namespace internal
43 }  // namespace webrtc
44 
45 #endif  // WEBRTC_AUDIO_SCOPED_VOE_INTERFACE_H_
46