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37 lines
1.0 KiB
C++
37 lines
1.0 KiB
C++
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// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/task/sequence_manager/lazy_now.h"
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#include "base/time/tick_clock.h"
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namespace base {
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namespace sequence_manager {
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LazyNow::LazyNow(TimeTicks now) : tick_clock_(nullptr), now_(now) {}
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LazyNow::LazyNow(const TickClock* tick_clock)
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: tick_clock_(tick_clock), now_() {
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DCHECK(tick_clock);
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}
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LazyNow::LazyNow(LazyNow&& move_from) noexcept
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: tick_clock_(move_from.tick_clock_), now_(move_from.now_) {
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move_from.tick_clock_ = nullptr;
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move_from.now_ = nullopt;
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}
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TimeTicks LazyNow::Now() {
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// It looks tempting to avoid using Optional and to rely on is_null() instead,
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// but in some test environments clock intentionally starts from zero.
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if (!now_) {
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DCHECK(tick_clock_); // It can fire only on use after std::move.
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now_ = tick_clock_->NowTicks();
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}
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return *now_;
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}
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} // namespace sequence_manager
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} // namespace base
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