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.
8 #include "base/base_export.h"
9 #include "base/time/time.h"
13 // A Clock is an interface for objects that vend Times. It is
14 // intended to be able to test the behavior of classes with respect to
17 // See DefaultClock (base/time/default_clock.h) for the default
18 // implementation that simply uses Time::Now().
20 // (An implementation that uses Time::SystemTime() should be added as
23 // See SimpleTestClock (base/test/simple_test_clock.h) for a simple
24 // test implementation.
26 // See TickClock (base/time/tick_clock.h) for the equivalent interface for
28 class BASE_EXPORT Clock
{
32 // Now() must be safe to call from any thread. The caller cannot
33 // make any ordering assumptions about the returned Time. For
34 // example, the system clock may change to an earlier time.
35 virtual Time
Now() = 0;
40 #endif // BASE_CLOCK_H_