| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ |
| #define COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ |
| |
| #include "base/time/time.h" |
| |
| namespace base { |
| class TickClock; |
| } |
| |
| namespace scheduler { |
| |
| // Now() is somewhat expensive so it makes sense not to call Now() unless we |
| // really need to. |
| class LazyNow { |
| public: |
| explicit LazyNow(base::TimeTicks now) : tick_clock_(nullptr), now_(now) { |
| DCHECK(!now.is_null()); |
| } |
| |
| explicit LazyNow(base::TickClock* tick_clock) : tick_clock_(tick_clock) {} |
| |
| base::TimeTicks Now(); |
| |
| private: |
| base::TickClock* tick_clock_; // NOT OWNED |
| base::TimeTicks now_; |
| }; |
| |
| } // namespace scheduler |
| |
| #endif // COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ |