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