/* * Copyright (c) 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.
*/
namespace webrtc { // Provides a simple way to perform an operation (such as logging) one // time in a certain scope. // Example: // OneTimeEvent firstFrame; // ... // if (firstFrame()) { // RTC_LOG(LS_INFO) << "This is the first frame". // } class OneTimeEvent { public:
OneTimeEvent() {} booloperator()() {
MutexLock lock(&mutex_); if (happened_) { returnfalse;
}
happened_ = true; returntrue;
}
private: bool happened_ = false;
Mutex mutex_;
};
// A non-thread-safe, ligher-weight version of the OneTimeEvent class. class ThreadUnsafeOneTimeEvent { public:
ThreadUnsafeOneTimeEvent() {} booloperator()() { if (happened_) { returnfalse;
}
happened_ = true; returntrue;
}
private: bool happened_ = false;
};
} // namespace webrtc
#endif// RTC_BASE_ONE_TIME_EVENT_H_
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