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