74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TIMER_ELAPSED_TIMER_H_
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#define BASE_TIMER_ELAPSED_TIMER_H_
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#include "base/base_export.h"
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#include "base/macros.h"
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#include "base/time/time.h"
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namespace base {
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// A simple wrapper around TimeTicks::Now().
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class BASE_EXPORT ElapsedTimer {
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public:
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ElapsedTimer();
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ElapsedTimer(ElapsedTimer&& other);
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void operator=(ElapsedTimer&& other);
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// Returns the time elapsed since object construction.
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TimeDelta Elapsed() const;
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// Returns the timestamp of the creation of this timer.
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TimeTicks Begin() const { return begin_; }
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private:
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TimeTicks begin_;
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DISALLOW_COPY_AND_ASSIGN(ElapsedTimer);
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};
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// A simple wrapper around ThreadTicks::Now().
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class BASE_EXPORT ElapsedThreadTimer {
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public:
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ElapsedThreadTimer();
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// Returns the ThreadTicks time elapsed since object construction.
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// Only valid if |is_supported()| returns true, otherwise returns TimeDelta().
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TimeDelta Elapsed() const;
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bool is_supported() const { return is_supported_; }
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private:
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const bool is_supported_;
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const ThreadTicks begin_;
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DISALLOW_COPY_AND_ASSIGN(ElapsedThreadTimer);
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};
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// Whenever there's a ScopedMockElapsedTimersForTest in scope,
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// Elapsed(Thread)Timers will always return kMockElapsedTime from Elapsed().
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// This is useful, for example, in unit tests that verify that their impl
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// records timing histograms. It enables such tests to observe reliable timings.
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class BASE_EXPORT ScopedMockElapsedTimersForTest {
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public:
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static constexpr TimeDelta kMockElapsedTime =
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TimeDelta::FromMilliseconds(1337);
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// ScopedMockElapsedTimersForTest is not thread-safe (it must be instantiated
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// in a test before other threads begin using ElapsedTimers; and it must
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// conversely outlive any usage of ElapsedTimer in that test).
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ScopedMockElapsedTimersForTest();
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~ScopedMockElapsedTimersForTest();
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private:
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DISALLOW_COPY_AND_ASSIGN(ScopedMockElapsedTimersForTest);
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};
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} // namespace base
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#endif // BASE_TIMER_ELAPSED_TIMER_H_
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