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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef BASE_TICK_CLOCK_H_ |
| 6 #define BASE_TICK_CLOCK_H_ |
| 7 |
| 8 #include "base/base_export.h" |
| 9 #include "base/time.h" |
| 10 |
| 11 namespace base { |
| 12 |
| 13 // A TickClock is an interface for objects that vend TimeTicks. It is |
| 14 // intended to be able to test the behavior of classes with respect to |
| 15 // non-decreasing time. |
| 16 // |
| 17 // See DefaultTickClock (base/default_tick_clock.h) for the default |
| 18 // implementation that simply uses TimeTicks::Now(). |
| 19 // |
| 20 // (Other implementations that use TimeTicks::HighResNow() or |
| 21 // TimeTicks::NowFromSystemTime() should be added as needed.) |
| 22 // |
| 23 // See SimpleTestTickClock (base/test/simple_test_tick_clock.h) for a |
| 24 // simple test implementation. |
| 25 // |
| 26 // See Clock (base/clock.h) for the equivalent interface for Times. |
| 27 class BASE_EXPORT TickClock { |
| 28 public: |
| 29 virtual ~TickClock(); |
| 30 |
| 31 // NowTicks() must be safe to call from any thread. The caller may |
| 32 // assume that NowTicks() is monotonic (but not strictly monotonic). |
| 33 // In other words, the returned TimeTicks will never decrease with |
| 34 // time, although they might "stand still". |
| 35 virtual TimeTicks NowTicks() = 0; |
| 36 }; |
| 37 |
| 38 } // namespace base |
| 39 |
| 40 #endif // BASE_TICK_CLOCK_H_ |
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