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35214fcfe2
Bug: webrtc:9419 Change-Id: I3225259fb4cc55e9820f590928795f4587f1e3cb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153884 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29479}
71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_MESSAGE_HANDLER_H_
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#define RTC_BASE_MESSAGE_HANDLER_H_
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#include <utility>
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#include "rtc_base/constructor_magic.h"
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#include "rtc_base/system/rtc_export.h"
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namespace rtc {
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struct Message;
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// Messages get dispatched to a MessageHandler
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class RTC_EXPORT MessageHandler {
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public:
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virtual ~MessageHandler();
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virtual void OnMessage(Message* msg) = 0;
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protected:
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MessageHandler() {}
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private:
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RTC_DISALLOW_COPY_AND_ASSIGN(MessageHandler);
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};
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// Helper class to facilitate executing a functor on a thread.
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template <class ReturnT, class FunctorT>
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class FunctorMessageHandler : public MessageHandler {
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public:
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explicit FunctorMessageHandler(FunctorT&& functor)
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: functor_(std::forward<FunctorT>(functor)) {}
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virtual void OnMessage(Message* msg) { result_ = functor_(); }
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const ReturnT& result() const { return result_; }
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// Returns moved result. Should not call result() or MoveResult() again
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// after this.
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ReturnT MoveResult() { return std::move(result_); }
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private:
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FunctorT functor_;
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ReturnT result_;
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};
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// Specialization for ReturnT of void.
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template <class FunctorT>
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class FunctorMessageHandler<void, FunctorT> : public MessageHandler {
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public:
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explicit FunctorMessageHandler(FunctorT&& functor)
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: functor_(std::forward<FunctorT>(functor)) {}
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virtual void OnMessage(Message* msg) { functor_(); }
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void result() const {}
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void MoveResult() {}
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private:
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FunctorT functor_;
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};
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} // namespace rtc
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#endif // RTC_BASE_MESSAGE_HANDLER_H_
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