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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef STOPWATCH_H_
#define STOPWATCH_H_
#include <cstdint>
#include <memory>
#include "clock.h"
namespace profiler {
// Class for measuring elapsed time
// Example:
// Stopwatch stopwatch;
// ... do stuff ...
// Log(stopwatch.GetElapsed())
//
// stopwatch.Start();
// ... do more stuff ...
// Log(stopwatch.GetElapsed())
class Stopwatch final {
public:
Stopwatch();
// Constructor which can take a custom clock, useful for testing
Stopwatch(std::shared_ptr<Clock> clock);
// Start counting time from now.
//
// Note: A stopwatch is automatically started upon construction.
void Start();
// Returns number of nanoseconds elapsed since either the stopwatch was
// created or since the last call to Start was made.
uint64_t GetElapsed() const;
private:
std::shared_ptr<Clock> clock_;
uint64_t start_time_;
};
} // namespace profiler
#endif //STOPWATCH_H_
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