41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
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// Copyright (c) 2012 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_TICK_CLOCK_H_
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#define BASE_TICK_CLOCK_H_
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#include "base/base_export.h"
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#include "base/time/time.h"
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namespace base {
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// A TickClock is an interface for objects that vend TimeTicks. It is
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// intended to be able to test the behavior of classes with respect to
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// non-decreasing time.
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//
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// See DefaultTickClock (base/time/default_tick_clock.h) for the default
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// implementation that simply uses TimeTicks::Now().
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//
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// (Other implementations that use TimeTicks::HighResNow() or
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// TimeTicks::NowFromSystemTime() should be added as needed.)
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//
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// See SimpleTestTickClock (base/test/simple_test_tick_clock.h) for a
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// simple test implementation.
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//
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// See Clock (base/time/clock.h) for the equivalent interface for Times.
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class BASE_EXPORT TickClock {
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public:
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virtual ~TickClock();
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// NowTicks() must be safe to call from any thread. The caller may
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// assume that NowTicks() is monotonic (but not strictly monotonic).
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// In other words, the returned TimeTicks will never decrease with
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// time, although they might "stand still".
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virtual TimeTicks NowTicks() = 0;
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};
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} // namespace base
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#endif // BASE_TICK_CLOCK_H_
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