mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 22:36:09 +03:00
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
|
// Copyright 2018 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 BASE_TASK_SEQUENCE_MANAGER_LAZY_NOW_H_
|
||
|
|
#define BASE_TASK_SEQUENCE_MANAGER_LAZY_NOW_H_
|
||
|
|
|
||
|
|
#include "base/base_export.h"
|
||
|
|
#include "base/optional.h"
|
||
|
|
#include "base/time/time.h"
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
|
||
|
|
class TickClock;
|
||
|
|
|
||
|
|
namespace sequence_manager {
|
||
|
|
|
||
|
|
// Now() is somewhat expensive so it makes sense not to call Now() unless we
|
||
|
|
// really need to and to avoid subsequent calls if already called once.
|
||
|
|
// LazyNow objects are expected to be short-living to represent accurate time.
|
||
|
|
class BASE_EXPORT LazyNow {
|
||
|
|
public:
|
||
|
|
explicit LazyNow(TimeTicks now);
|
||
|
|
explicit LazyNow(const TickClock* tick_clock);
|
||
|
|
|
||
|
|
LazyNow(LazyNow&& move_from) noexcept;
|
||
|
|
|
||
|
|
// Result will not be updated on any subsesequent calls.
|
||
|
|
TimeTicks Now();
|
||
|
|
|
||
|
|
private:
|
||
|
|
const TickClock* tick_clock_; // Not owned.
|
||
|
|
Optional<TimeTicks> now_;
|
||
|
|
|
||
|
|
DISALLOW_COPY_AND_ASSIGN(LazyNow);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace sequence_manager
|
||
|
|
} // namespace base
|
||
|
|
|
||
|
|
#endif // BASE_TASK_SEQUENCE_MANAGER_LAZY_NOW_H_
|