66 строки
1.7 KiB
C++
66 строки
1.7 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <chrono>
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namespace facebook {
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namespace react {
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/*
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* Represents a monotonic clock suitable for measuring intervals.
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*/
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using TelemetryClock = std::chrono::steady_clock;
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/*
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* Represents a point in time satisfied the requirements of TelemetryClock.
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*/
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using TelemetryTimePoint = TelemetryClock::time_point;
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/*
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* Represents a time interval satisfied the requirements of TelemetryClock.
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*/
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using TelemetryDuration = std::chrono::nanoseconds;
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/*
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* Represents a time point which never happens.
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*/
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static TelemetryTimePoint const kTelemetryUndefinedTimePoint =
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TelemetryTimePoint::max();
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/*
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* Returns a time point representing the current point in time.
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*/
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static inline TelemetryTimePoint telemetryTimePointNow() {
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return TelemetryClock::now();
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}
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/*
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* Returns a number of milliseconds that passed from some epoch starting time
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* point to a given time point. The epoch starting time point is not specified
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* but stays the same for an application run.
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*/
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static inline int64_t telemetryTimePointToMilliseconds(
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TelemetryTimePoint timePoint) {
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return std::chrono::duration_cast<std::chrono::milliseconds>(
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timePoint - TelemetryTimePoint{})
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.count();
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}
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/*
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* Returns a number of milliseconds that represents the given duration object.
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*/
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static inline int64_t telemetryDurationToMilliseconds(
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TelemetryDuration duration) {
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return std::chrono::duration_cast<std::chrono::milliseconds>(duration)
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.count();
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}
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} // namespace react
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} // namespace facebook
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