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38 lines
1.3 KiB
38 lines
1.3 KiB
// 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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#ifndef PLATFORM_API_TIME_H_
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#define PLATFORM_API_TIME_H_
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#include <chrono>
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#include "platform/base/trivial_clock_traits.h"
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namespace openscreen {
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// The "reasonably high-resolution" source of monotonic time from the embedder,
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// exhibiting the traits described in TrivialClockTraits. This class is not
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// instantiated. It only contains a static now() function.
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//
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// For example, the default platform implementation bases this on
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// std::chrono::steady_clock or std::chrono::high_resolution_clock, but an
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// embedder may choose to use a different source of time (e.g., the embedder's
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// time library, a simulated time source, or a mock).
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class Clock : public TrivialClockTraits {
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public:
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// Returns the current time.
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static time_point now() noexcept;
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};
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// Returns the number of seconds since UNIX epoch (1 Jan 1970, midnight)
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// according to the wall clock, which is subject to adjustments (e.g., via NTP).
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// Note that this is NOT necessarily the same time source as Clock::now() above,
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// and is NOT guaranteed to be monotonically non-decreasing; it is "calendar
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// time."
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std::chrono::seconds GetWallTimeSinceUnixEpoch() noexcept;
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} // namespace openscreen
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#endif // PLATFORM_API_TIME_H_
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