chromium/base/timer/elapsed_timer.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TIMER_ELAPSED_TIMER_H_
#define BASE_TIMER_ELAPSED_TIMER_H_

#include "base/base_export.h"
#include "base/time/time.h"

namespace base {

// A simple wrapper around TimeTicks::Now().
class BASE_EXPORT ElapsedTimer { … };

// A simple wrapper around ThreadTicks::Now().
class BASE_EXPORT ElapsedThreadTimer { … };

// Whenever there's a ScopedMockElapsedTimersForTest in scope,
// Elapsed(Thread)Timers will always return kMockElapsedTime from Elapsed().
// This is useful, for example, in unit tests that verify that their impl
// records timing histograms. It enables such tests to observe reliable timings.
class BASE_EXPORT ScopedMockElapsedTimersForTest { … };

}  // namespace base

#endif  // BASE_TIMER_ELAPSED_TIMER_H_