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1 /* | 1 /* |
2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. | 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #ifndef WEBRTC_BASE_MESSAGEHANDLER_H_ | 11 #ifndef WEBRTC_BASE_MESSAGEHANDLER_H_ |
12 #define WEBRTC_BASE_MESSAGEHANDLER_H_ | 12 #define WEBRTC_BASE_MESSAGEHANDLER_H_ |
13 | 13 |
14 #include <memory> | |
15 #include <utility> | |
16 | 14 |
17 #include "webrtc/base/constructormagic.h" | 15 // This header is deprecated and is just left here temporarily during |
18 | 16 // refactoring. See https://bugs.webrtc.org/7634 for more details. |
19 namespace rtc { | 17 #include "webrtc/rtc_base/messagehandler.h" |
20 | |
21 struct Message; | |
22 | |
23 // Messages get dispatched to a MessageHandler | |
24 | |
25 class MessageHandler { | |
26 public: | |
27 virtual ~MessageHandler(); | |
28 virtual void OnMessage(Message* msg) = 0; | |
29 | |
30 protected: | |
31 MessageHandler() {} | |
32 | |
33 private: | |
34 RTC_DISALLOW_COPY_AND_ASSIGN(MessageHandler); | |
35 }; | |
36 | |
37 // Helper class to facilitate executing a functor on a thread. | |
38 template <class ReturnT, class FunctorT> | |
39 class FunctorMessageHandler : public MessageHandler { | |
40 public: | |
41 explicit FunctorMessageHandler(const FunctorT& functor) | |
42 : functor_(functor) {} | |
43 virtual void OnMessage(Message* msg) { | |
44 result_ = functor_(); | |
45 } | |
46 const ReturnT& result() const { return result_; } | |
47 | |
48 // Returns moved result. Should not call result() or MoveResult() again | |
49 // after this. | |
50 ReturnT MoveResult() { return std::move(result_); } | |
51 | |
52 private: | |
53 FunctorT functor_; | |
54 ReturnT result_; | |
55 }; | |
56 | |
57 // Specialization for ReturnT of void. | |
58 template <class FunctorT> | |
59 class FunctorMessageHandler<void, FunctorT> : public MessageHandler { | |
60 public: | |
61 explicit FunctorMessageHandler(const FunctorT& functor) | |
62 : functor_(functor) {} | |
63 virtual void OnMessage(Message* msg) { | |
64 functor_(); | |
65 } | |
66 void result() const {} | |
67 void MoveResult() {} | |
68 | |
69 private: | |
70 FunctorT functor_; | |
71 }; | |
72 | |
73 } // namespace rtc | |
74 | 18 |
75 #endif // WEBRTC_BASE_MESSAGEHANDLER_H_ | 19 #endif // WEBRTC_BASE_MESSAGEHANDLER_H_ |
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