blob: 2fbceaaefdde5a20fbb88b9e73879b0bc5c6ff03 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/task/common/lazy_now.h"
#include "base/check.h"
#include "base/time/tick_clock.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace base {
LazyNow::LazyNow(TimeTicks now) : now_(now), tick_clock_(nullptr) {}
LazyNow::LazyNow(absl::optional<TimeTicks> now, const TickClock* tick_clock)
: now_(now), tick_clock_(tick_clock) {
DCHECK(tick_clock);
}
LazyNow::LazyNow(const TickClock* tick_clock) : tick_clock_(tick_clock) {
DCHECK(tick_clock);
}
LazyNow::LazyNow(LazyNow&& move_from) noexcept
: now_(move_from.now_), tick_clock_(move_from.tick_clock_) {
move_from.tick_clock_ = nullptr;
move_from.now_ = absl::nullopt;
}
TimeTicks LazyNow::Now() {
// It looks tempting to avoid using Optional and to rely on is_null() instead,
// but in some test environments clock intentionally starts from zero.
if (!now_) {
DCHECK(tick_clock_); // It can fire only on use after std::move.
now_ = tick_clock_->NowTicks();
}
return *now_;
}
} // namespace base
|
