139 lines
4.3 KiB
C++
139 lines
4.3 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef API_UNITS_TIMESTAMP_H_
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#define API_UNITS_TIMESTAMP_H_
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#ifdef WEBRTC_UNIT_TEST
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#include <ostream> // no-presubmit-check TODO(webrtc:8982)
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#endif // WEBRTC_UNIT_TEST
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#include <string>
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#include <type_traits>
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#include "api/units/time_delta.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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// Timestamp represents the time that has passed since some unspecified epoch.
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// The epoch is assumed to be before any represented timestamps, this means that
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// negative values are not valid. The most notable feature is that the
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// difference of two Timestamps results in a TimeDelta.
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class Timestamp final : public rtc_units_impl::UnitBase<Timestamp> {
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public:
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template <typename T>
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static constexpr Timestamp Seconds(T value) {
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static_assert(std::is_arithmetic<T>::value, "");
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return FromFraction(1'000'000, value);
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}
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template <typename T>
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static constexpr Timestamp Millis(T value) {
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static_assert(std::is_arithmetic<T>::value, "");
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return FromFraction(1'000, value);
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}
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template <typename T>
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static constexpr Timestamp Micros(T value) {
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static_assert(std::is_arithmetic<T>::value, "");
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return FromValue(value);
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}
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Timestamp() = delete;
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template <typename T = int64_t>
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constexpr T seconds() const {
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return ToFraction<1000000, T>();
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}
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template <typename T = int64_t>
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constexpr T ms() const {
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return ToFraction<1000, T>();
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}
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template <typename T = int64_t>
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constexpr T us() const {
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return ToValue<T>();
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}
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constexpr int64_t seconds_or(int64_t fallback_value) const {
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return ToFractionOr<1000000>(fallback_value);
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}
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constexpr int64_t ms_or(int64_t fallback_value) const {
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return ToFractionOr<1000>(fallback_value);
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}
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constexpr int64_t us_or(int64_t fallback_value) const {
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return ToValueOr(fallback_value);
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}
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constexpr Timestamp operator+(const TimeDelta delta) const {
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if (IsPlusInfinity() || delta.IsPlusInfinity()) {
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RTC_DCHECK(!IsMinusInfinity());
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RTC_DCHECK(!delta.IsMinusInfinity());
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return PlusInfinity();
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} else if (IsMinusInfinity() || delta.IsMinusInfinity()) {
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RTC_DCHECK(!IsPlusInfinity());
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RTC_DCHECK(!delta.IsPlusInfinity());
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return MinusInfinity();
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}
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return Timestamp::Micros(us() + delta.us());
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}
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constexpr Timestamp operator-(const TimeDelta delta) const {
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if (IsPlusInfinity() || delta.IsMinusInfinity()) {
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RTC_DCHECK(!IsMinusInfinity());
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RTC_DCHECK(!delta.IsPlusInfinity());
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return PlusInfinity();
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} else if (IsMinusInfinity() || delta.IsPlusInfinity()) {
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RTC_DCHECK(!IsPlusInfinity());
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RTC_DCHECK(!delta.IsMinusInfinity());
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return MinusInfinity();
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}
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return Timestamp::Micros(us() - delta.us());
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}
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constexpr TimeDelta operator-(const Timestamp other) const {
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if (IsPlusInfinity() || other.IsMinusInfinity()) {
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RTC_DCHECK(!IsMinusInfinity());
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RTC_DCHECK(!other.IsPlusInfinity());
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return TimeDelta::PlusInfinity();
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} else if (IsMinusInfinity() || other.IsPlusInfinity()) {
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RTC_DCHECK(!IsPlusInfinity());
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RTC_DCHECK(!other.IsMinusInfinity());
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return TimeDelta::MinusInfinity();
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}
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return TimeDelta::Micros(us() - other.us());
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}
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constexpr Timestamp& operator-=(const TimeDelta delta) {
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*this = *this - delta;
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return *this;
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}
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constexpr Timestamp& operator+=(const TimeDelta delta) {
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*this = *this + delta;
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return *this;
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}
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private:
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friend class rtc_units_impl::UnitBase<Timestamp>;
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using UnitBase::UnitBase;
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static constexpr bool one_sided = true;
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};
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std::string ToString(Timestamp value);
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inline std::string ToLogString(Timestamp value) {
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return ToString(value);
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}
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#ifdef WEBRTC_UNIT_TEST
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inline std::ostream& operator<<( // no-presubmit-check TODO(webrtc:8982)
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std::ostream& stream, // no-presubmit-check TODO(webrtc:8982)
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Timestamp value) {
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return stream << ToString(value);
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}
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#endif // WEBRTC_UNIT_TEST
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} // namespace webrtc
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#endif // API_UNITS_TIMESTAMP_H_
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