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STL/stl/inc/__msvc_chrono.hpp

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// __msvc_chrono.hpp internal header
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#ifndef __MSVC_CHRONO_HPP
#define __MSVC_CHRONO_HPP
#include <yvals.h>
#if _STL_COMPILER_PREPROCESSOR
#include <ctime>
#include <limits>
#include <ratio>
#include <type_traits>
#include <utility>
#include <xtimec.h>
#if _HAS_CXX20
#include <compare>
#endif
#pragma pack(push, _CRT_PACKING)
#pragma warning(push, _STL_WARNING_LEVEL)
#pragma warning(disable : _STL_DISABLED_WARNINGS)
_STL_DISABLE_CLANG_WARNINGS
#pragma push_macro("new")
#undef new
_STD_BEGIN
namespace chrono {
_EXPORT_STD template <class _Rep>
struct treat_as_floating_point : is_floating_point<_Rep> {}; // tests for floating-point type
_EXPORT_STD template <class _Rep>
constexpr bool treat_as_floating_point_v = treat_as_floating_point<_Rep>::value;
_EXPORT_STD template <class _Rep>
struct duration_values { // gets arithmetic properties of a type
_NODISCARD static constexpr _Rep zero() noexcept {
// get zero value
return _Rep(0);
}
_NODISCARD static constexpr _Rep(min)() noexcept {
// get smallest value
return numeric_limits<_Rep>::lowest();
}
_NODISCARD static constexpr _Rep(max)() noexcept {
// get largest value
return (numeric_limits<_Rep>::max)();
}
};
#if _HAS_CXX20
_EXPORT_STD template <class _Clock>
constexpr bool is_clock_v = requires {
typename _Clock::rep;
typename _Clock::period;
typename _Clock::duration;
typename _Clock::time_point;
_Clock::is_steady;
_Clock::now();
};
_EXPORT_STD template <class _Clock>
struct is_clock : bool_constant<is_clock_v<_Clock>> {};
template <class _Clock>
constexpr bool _Is_clock_v = is_clock_v<_Clock>;
#else // ^^^ _HAS_CXX20 / !_HAS_CXX20 vvv
template <class _Clock, class = void>
constexpr bool _Is_clock_v = false;
template <class _Clock>
constexpr bool
_Is_clock_v<_Clock, void_t<typename _Clock::rep, typename _Clock::period, typename _Clock::duration,
typename _Clock::time_point, decltype(_Clock::is_steady), decltype(_Clock::now())>> =
true;
#endif // ^^^ !_HAS_CXX20 ^^^
_EXPORT_STD template <class _Rep, class _Period = ratio<1>>
class duration;
template <class _Ty>
constexpr bool _Is_duration_v = _Is_specialization_v<_Ty, duration>;
_EXPORT_STD template <class _To, class _Rep, class _Period, enable_if_t<_Is_duration_v<_To>, int> = 0>
constexpr _To duration_cast(const duration<_Rep, _Period>&)
noexcept(is_arithmetic_v<_Rep> && is_arithmetic_v<typename _To::rep>); // strengthened
_EXPORT_STD template <class _Rep, class _Period>
class duration { // represents a time duration
public:
using rep = _Rep;
using period = typename _Period::type;
static_assert(!_Is_duration_v<_Rep>, "duration can't have duration as first template argument");
static_assert(_Is_ratio_v<_Period>, "period not an instance of std::ratio");
static_assert(0 < _Period::num, "period negative or zero");
constexpr duration() = default;
template <class _Rep2,
enable_if_t<is_convertible_v<const _Rep2&, _Rep>
&& (treat_as_floating_point_v<_Rep> || !treat_as_floating_point_v<_Rep2>),
int> = 0>
constexpr explicit duration(const _Rep2& _Val)
noexcept(is_arithmetic_v<_Rep> && is_arithmetic_v<_Rep2>) // strengthened
: _MyRep(static_cast<_Rep>(_Val)) {}
template <class _Rep2, class _Period2,
enable_if_t<treat_as_floating_point_v<_Rep>
|| (_Ratio_divide_sfinae<_Period2, _Period>::den == 1 && !treat_as_floating_point_v<_Rep2>),
int> = 0>
constexpr duration(const duration<_Rep2, _Period2>& _Dur)
noexcept(is_arithmetic_v<_Rep> && is_arithmetic_v<_Rep2>) // strengthened
: _MyRep(_CHRONO duration_cast<duration>(_Dur).count()) {}
_NODISCARD constexpr _Rep count() const noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
return _MyRep;
}
_NODISCARD constexpr common_type_t<duration> operator+() const
noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
return common_type_t<duration>(*this);
}
_NODISCARD constexpr common_type_t<duration> operator-() const
noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
return common_type_t<duration>(-_MyRep);
}
_CONSTEXPR17 duration& operator++() noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
++_MyRep;
return *this;
}
_CONSTEXPR17 duration operator++(int) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
return duration(_MyRep++);
}
_CONSTEXPR17 duration& operator--() noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
--_MyRep;
return *this;
}
_CONSTEXPR17 duration operator--(int) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
return duration(_MyRep--);
}
_CONSTEXPR17 duration& operator+=(const duration& _Right) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
_MyRep += _Right._MyRep;
return *this;
}
_CONSTEXPR17 duration& operator-=(const duration& _Right) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
_MyRep -= _Right._MyRep;
return *this;
}
_CONSTEXPR17 duration& operator*=(const _Rep& _Right) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
_MyRep *= _Right;
return *this;
}
_CONSTEXPR17 duration& operator/=(const _Rep& _Right) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
_MyRep /= _Right;
return *this;
}
_CONSTEXPR17 duration& operator%=(const _Rep& _Right) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
_MyRep %= _Right;
return *this;
}
_CONSTEXPR17 duration& operator%=(const duration& _Right) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
_MyRep %= _Right.count();
return *this;
}
_NODISCARD static constexpr duration zero() noexcept {
// get zero value
return duration(duration_values<_Rep>::zero());
}
_NODISCARD static constexpr duration(min)() noexcept {
// get minimum value
return duration((duration_values<_Rep>::min)());
}
_NODISCARD static constexpr duration(max)() noexcept {
// get maximum value
return duration((duration_values<_Rep>::max)());
}
private:
_Rep _MyRep; // the stored rep
};
_EXPORT_STD template <class _Clock, class _Duration = typename _Clock::duration>
class time_point { // represents a point in time
public:
using clock = _Clock;
using duration = _Duration;
using rep = typename _Duration::rep;
using period = typename _Duration::period;
static_assert(_Is_duration_v<_Duration>,
"N4950 [time.point.general]/1 mandates Duration to be a specialization of chrono::duration.");
constexpr time_point() = default;
constexpr explicit time_point(const _Duration& _Other) noexcept(is_arithmetic_v<rep>) // strengthened
: _MyDur(_Other) {}
template <class _Duration2, enable_if_t<is_convertible_v<_Duration2, _Duration>, int> = 0>
constexpr time_point(const time_point<_Clock, _Duration2>& _Tp)
noexcept(is_arithmetic_v<rep> && is_arithmetic_v<typename _Duration2::rep>) // strengthened
: _MyDur(_Tp.time_since_epoch()) {}
_NODISCARD constexpr _Duration time_since_epoch() const noexcept(is_arithmetic_v<rep>) /* strengthened */ {
return _MyDur;
}
#if _HAS_CXX20
constexpr time_point& operator++() noexcept(is_arithmetic_v<rep>) /* strengthened */ {
++_MyDur;
return *this;
}
constexpr time_point operator++(int) noexcept(is_arithmetic_v<rep>) /* strengthened */ {
return time_point{_MyDur++};
}
constexpr time_point& operator--() noexcept(is_arithmetic_v<rep>) /* strengthened */ {
--_MyDur;
return *this;
}
constexpr time_point operator--(int) noexcept(is_arithmetic_v<rep>) /* strengthened */ {
return time_point{_MyDur--};
}
#endif // _HAS_CXX20
_CONSTEXPR17 time_point& operator+=(const _Duration& _Dur) noexcept(is_arithmetic_v<rep>) /* strengthened */ {
_MyDur += _Dur;
return *this;
}
_CONSTEXPR17 time_point& operator-=(const _Duration& _Dur) noexcept(is_arithmetic_v<rep>) /* strengthened */ {
_MyDur -= _Dur;
return *this;
}
_NODISCARD static constexpr time_point(min)() noexcept {
return time_point((_Duration::min)());
}
_NODISCARD static constexpr time_point(max)() noexcept {
return time_point((_Duration::max)());
}
private:
_Duration _MyDur{duration::zero()}; // duration since the epoch
};
} // namespace chrono
template <class _Rep, class _Period>
constexpr bool _Is_trivially_swappable_v<chrono::duration<_Rep, _Period>> = _Is_trivially_swappable_v<_Rep>;
template <class _Clock, class _Duration>
constexpr bool _Is_trivially_swappable_v<chrono::time_point<_Clock, _Duration>> = _Is_trivially_swappable_v<_Duration>;
_NODISCARD constexpr intmax_t _Lcm(const intmax_t _Ax, const intmax_t _Bx) noexcept {
return (_Ax / _Gcd(_Ax, _Bx)) * _Bx;
}
template <class _Rep1, class _Period1, class _Rep2, class _Period2>
struct common_type<_CHRONO duration<_Rep1, _Period1>, _CHRONO duration<_Rep2, _Period2>> {
using type = _CHRONO duration<common_type_t<_Rep1, _Rep2>,
ratio<_Gcd(_Period1::num, _Period2::num), _Lcm(_Period1::den, _Period2::den)>>;
};
template <class _Clock, class _Duration1, class _Duration2>
struct common_type<_CHRONO time_point<_Clock, _Duration1>,
_CHRONO time_point<_Clock, _Duration2>> { // common type of two time points
using type = _CHRONO time_point<_Clock, common_type_t<_Duration1, _Duration2>>;
};
namespace chrono {
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>> operator+(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CD = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>;
return _CD(_CD(_Left).count() + _CD(_Right).count());
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>> operator-(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CD = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>;
return _CD(_CD(_Left).count() - _CD(_Right).count());
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2,
enable_if_t<is_convertible_v<const _Rep2&, common_type_t<_Rep1, _Rep2>>, int> = 0>
_NODISCARD constexpr duration<common_type_t<_Rep1, _Rep2>, _Period1> operator*(
const duration<_Rep1, _Period1>& _Left, const _Rep2& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CR = common_type_t<_Rep1, _Rep2>;
using _CD = duration<_CR, _Period1>;
return _CD(_CD(_Left).count() * _Right);
}
_EXPORT_STD template <class _Rep1, class _Rep2, class _Period2,
enable_if_t<is_convertible_v<const _Rep1&, common_type_t<_Rep1, _Rep2>>, int> = 0>
_NODISCARD constexpr duration<common_type_t<_Rep1, _Rep2>, _Period2> operator*(
const _Rep1& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
return _Right * _Left;
}
template <class _CR, class _Period1, class _Rep2, bool = is_convertible_v<const _Rep2&, _CR>>
struct _Duration_div_mod1 { // return type for duration / rep and duration % rep
using type = duration<_CR, _Period1>;
};
template <class _CR, class _Period1, class _Rep2>
struct _Duration_div_mod1<_CR, _Period1, _Rep2, false> {}; // no return type
template <class _CR, class _Period1, class _Rep2, bool = _Is_duration_v<_Rep2>>
struct _Duration_div_mod {}; // no return type
template <class _CR, class _Period1, class _Rep2>
struct _Duration_div_mod<_CR, _Period1, _Rep2, false> : _Duration_div_mod1<_CR, _Period1, _Rep2> {
// return type for duration / rep and duration % rep
};
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2>
_NODISCARD constexpr typename _Duration_div_mod<common_type_t<_Rep1, _Rep2>, _Period1, _Rep2>::type operator/(
const duration<_Rep1, _Period1>& _Left, const _Rep2& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CR = common_type_t<_Rep1, _Rep2>;
using _CD = duration<_CR, _Period1>;
return _CD(_CD(_Left).count() / _Right);
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr common_type_t<_Rep1, _Rep2> operator/(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CD = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>;
return _CD(_Left).count() / _CD(_Right).count();
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2>
_NODISCARD constexpr typename _Duration_div_mod<common_type_t<_Rep1, _Rep2>, _Period1, _Rep2>::type operator%(
const duration<_Rep1, _Period1>& _Left, const _Rep2& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CR = common_type_t<_Rep1, _Rep2>;
using _CD = duration<_CR, _Period1>;
return _CD(_CD(_Left).count() % _Right);
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>> operator%(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CD = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>;
return _CD(_CD(_Left).count() % _CD(_Right).count());
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr bool operator==(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CT = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>;
return _CT(_Left).count() == _CT(_Right).count();
}
#if !_HAS_CXX20
template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr bool operator!=(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
return !(_Left == _Right);
}
#endif // !_HAS_CXX20
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr bool operator<(const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CT = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>;
return _CT(_Left).count() < _CT(_Right).count();
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr bool operator<=(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
return !(_Right < _Left);
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr bool operator>(const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
return _Right < _Left;
}
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
_NODISCARD constexpr bool operator>=(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
return !(_Left < _Right);
}
#if _HAS_CXX20
_EXPORT_STD template <class _Rep1, class _Period1, class _Rep2, class _Period2>
requires three_way_comparable<typename common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>::rep>
_NODISCARD constexpr auto operator<=>(
const duration<_Rep1, _Period1>& _Left, const duration<_Rep2, _Period2>& _Right)
noexcept(is_arithmetic_v<_Rep1> && is_arithmetic_v<_Rep2>) /* strengthened */ {
using _CT = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>;
return _CT(_Left).count() <=> _CT(_Right).count();
}
#endif // _HAS_CXX20
_EXPORT_STD template <class _To, class _Rep, class _Period, enable_if_t<_Is_duration_v<_To>, int> /* = 0 */>
_NODISCARD constexpr _To duration_cast(const duration<_Rep, _Period>& _Dur)
noexcept(is_arithmetic_v<_Rep> && is_arithmetic_v<typename _To::rep>) /* strengthened */ {
// convert duration to another duration; truncate
using _CF = ratio_divide<_Period, typename _To::period>;
using _ToRep = typename _To::rep;
using _CR = common_type_t<_ToRep, _Rep, intmax_t>;
constexpr bool _Num_is_one = _CF::num == 1;
constexpr bool _Den_is_one = _CF::den == 1;
if constexpr (_Den_is_one) {
if constexpr (_Num_is_one) {
return static_cast<_To>(static_cast<_ToRep>(_Dur.count()));
} else {
return static_cast<_To>(
static_cast<_ToRep>(static_cast<_CR>(_Dur.count()) * static_cast<_CR>(_CF::num)));
}
} else {
if constexpr (_Num_is_one) {
return static_cast<_To>(
static_cast<_ToRep>(static_cast<_CR>(_Dur.count()) / static_cast<_CR>(_CF::den)));
} else {
return static_cast<_To>(static_cast<_ToRep>(
static_cast<_CR>(_Dur.count()) * static_cast<_CR>(_CF::num) / static_cast<_CR>(_CF::den)));
}
}
}
_EXPORT_STD template <class _To, class _Rep, class _Period, enable_if_t<_Is_duration_v<_To>, int> = 0>
_NODISCARD constexpr _To floor(const duration<_Rep, _Period>& _Dur)
noexcept(is_arithmetic_v<_Rep> && is_arithmetic_v<typename _To::rep>) /* strengthened */ {
// convert duration to another duration; round towards negative infinity
// i.e. the greatest integral result such that the result <= _Dur
const _To _Casted{_CHRONO duration_cast<_To>(_Dur)};
if (_Casted > _Dur) {
return _To{_Casted.count() - static_cast<typename _To::rep>(1)};
}
return _Casted;
}
_EXPORT_STD template <class _To, class _Rep, class _Period, enable_if_t<_Is_duration_v<_To>, int> = 0>
_NODISCARD constexpr _To ceil(const duration<_Rep, _Period>& _Dur)
noexcept(is_arithmetic_v<_Rep> && is_arithmetic_v<typename _To::rep>) /* strengthened */ {
// convert duration to another duration; round towards positive infinity
// i.e. the least integral result such that _Dur <= the result
const _To _Casted{_CHRONO duration_cast<_To>(_Dur)};
if (_Casted < _Dur) {
return _To{_Casted.count() + static_cast<typename _To::rep>(1)};
}
return _Casted;
}
template <class _Rep>
constexpr bool _Is_even(_Rep _Val) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
// Tests whether _Val is even
return _Val % 2 == 0;
}
_EXPORT_STD template <class _To, class _Rep, class _Period,
enable_if_t<_Is_duration_v<_To> && !treat_as_floating_point_v<typename _To::rep>, int> = 0>
_NODISCARD constexpr _To round(const duration<_Rep, _Period>& _Dur)
noexcept(is_arithmetic_v<_Rep> && is_arithmetic_v<typename _To::rep>) /* strengthened */ {
// convert duration to another duration, round to nearest, ties to even
const _To _Floored{_CHRONO floor<_To>(_Dur)};
const _To _Ceiled{_Floored + _To{1}};
const auto _Floor_adjustment = _Dur - _Floored;
const auto _Ceil_adjustment = _Ceiled - _Dur;
if (_Floor_adjustment < _Ceil_adjustment
|| (_Floor_adjustment == _Ceil_adjustment && _Is_even(_Floored.count()))) {
return _Floored;
}
return _Ceiled;
}
_EXPORT_STD template <class _Rep, class _Period, enable_if_t<numeric_limits<_Rep>::is_signed, int> = 0>
_NODISCARD constexpr duration<_Rep, _Period> abs(const duration<_Rep, _Period> _Dur)
noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
// create a duration whose count() is the absolute value of _Dur.count()
if (_Dur < duration<_Rep, _Period>::zero()) {
return -_Dur;
} else {
return _Dur;
}
}
_EXPORT_STD using nanoseconds = duration<long long, nano>;
_EXPORT_STD using microseconds = duration<long long, micro>;
_EXPORT_STD using milliseconds = duration<long long, milli>;
_EXPORT_STD using seconds = duration<long long>;
_EXPORT_STD using minutes = duration<int, ratio<60>>;
_EXPORT_STD using hours = duration<int, ratio<3600>>;
#if _HAS_CXX20
_EXPORT_STD using days = duration<int, ratio_multiply<ratio<24>, hours::period>>;
_EXPORT_STD using weeks = duration<int, ratio_multiply<ratio<7>, days::period>>;
_EXPORT_STD using years = duration<int, ratio_multiply<ratio<146097, 400>, days::period>>;
_EXPORT_STD using months = duration<int, ratio_divide<years::period, ratio<12>>>;
#endif // _HAS_CXX20
_EXPORT_STD template <class _Clock, class _Duration, class _Rep, class _Period>
_NODISCARD constexpr time_point<_Clock, common_type_t<_Duration, duration<_Rep, _Period>>> operator+(
const time_point<_Clock, _Duration>& _Left, const duration<_Rep, _Period>& _Right)
noexcept(is_arithmetic_v<typename _Duration::rep> && is_arithmetic_v<_Rep>) /* strengthened */ {
using _RT = time_point<_Clock, common_type_t<_Duration, duration<_Rep, _Period>>>;
return _RT(_Left.time_since_epoch() + _Right);
}
_EXPORT_STD template <class _Rep, class _Period, class _Clock, class _Duration>
_NODISCARD constexpr time_point<_Clock, common_type_t<duration<_Rep, _Period>, _Duration>> operator+(
const duration<_Rep, _Period>& _Left, const time_point<_Clock, _Duration>& _Right)
noexcept(is_arithmetic_v<_Rep> && is_arithmetic_v<typename _Duration::rep>) /* strengthened */ {
return _Right + _Left;
}
_EXPORT_STD template <class _Clock, class _Duration, class _Rep, class _Period>
_NODISCARD constexpr time_point<_Clock, common_type_t<_Duration, duration<_Rep, _Period>>> operator-(
const time_point<_Clock, _Duration>& _Left, const duration<_Rep, _Period>& _Right)
noexcept(is_arithmetic_v<typename _Duration::rep> && is_arithmetic_v<_Rep>) /* strengthened */ {
using _RT = time_point<_Clock, common_type_t<_Duration, duration<_Rep, _Period>>>;
return _RT(_Left.time_since_epoch() - _Right);
}
_EXPORT_STD template <class _Clock, class _Duration1, class _Duration2>
_NODISCARD constexpr common_type_t<_Duration1, _Duration2> operator-(
const time_point<_Clock, _Duration1>& _Left, const time_point<_Clock, _Duration2>& _Right)
noexcept(
is_arithmetic_v<typename _Duration1::rep> && is_arithmetic_v<typename _Duration2::rep>) /* strengthened */ {
return _Left.time_since_epoch() - _Right.time_since_epoch();
}
_EXPORT_STD template <class _Clock, class _Duration1, class _Duration2>
_NODISCARD constexpr bool operator==(
const time_point<_Clock, _Duration1>& _Left, const time_point<_Clock, _Duration2>& _Right)
noexcept(
is_arithmetic_v<typename _Duration1::rep> && is_arithmetic_v<typename _Duration2::rep>) /* strengthened */ {
return _Left.time_since_epoch() == _Right.time_since_epoch();
}
#if !_HAS_CXX20
template <class _Clock, class _Duration1, class _Duration2>
_NODISCARD constexpr bool operator!=(
const time_point<_Clock, _Duration1>& _Left, const time_point<_Clock, _Duration2>& _Right)
noexcept(
is_arithmetic_v<typename _Duration1::rep> && is_arithmetic_v<typename _Duration2::rep>) /* strengthened */ {
return !(_Left == _Right);
}
#endif // !_HAS_CXX20
_EXPORT_STD template <class _Clock, class _Duration1, class _Duration2>
_NODISCARD constexpr bool operator<(
const time_point<_Clock, _Duration1>& _Left, const time_point<_Clock, _Duration2>& _Right)
noexcept(
is_arithmetic_v<typename _Duration1::rep> && is_arithmetic_v<typename _Duration2::rep>) /* strengthened */ {
return _Left.time_since_epoch() < _Right.time_since_epoch();
}
_EXPORT_STD template <class _Clock, class _Duration1, class _Duration2>
_NODISCARD constexpr bool operator<=(
const time_point<_Clock, _Duration1>& _Left, const time_point<_Clock, _Duration2>& _Right)
noexcept(
is_arithmetic_v<typename _Duration1::rep> && is_arithmetic_v<typename _Duration2::rep>) /* strengthened */ {
return !(_Right < _Left);
}
_EXPORT_STD template <class _Clock, class _Duration1, class _Duration2>
_NODISCARD constexpr bool operator>(
const time_point<_Clock, _Duration1>& _Left, const time_point<_Clock, _Duration2>& _Right)
noexcept(
is_arithmetic_v<typename _Duration1::rep> && is_arithmetic_v<typename _Duration2::rep>) /* strengthened */ {
return _Right < _Left;
}
_EXPORT_STD template <class _Clock, class _Duration1, class _Duration2>
_NODISCARD constexpr bool operator>=(
const time_point<_Clock, _Duration1>& _Left, const time_point<_Clock, _Duration2>& _Right)
noexcept(
is_arithmetic_v<typename _Duration1::rep> && is_arithmetic_v<typename _Duration2::rep>) /* strengthened */ {
return !(_Left < _Right);
}
#if _HAS_CXX20
_EXPORT_STD template <class _Clock, class _Duration1, three_way_comparable_with<_Duration1> _Duration2>
_NODISCARD constexpr auto operator<=>(
const time_point<_Clock, _Duration1>& _Left, const time_point<_Clock, _Duration2>& _Right)
noexcept(
is_arithmetic_v<typename _Duration1::rep> && is_arithmetic_v<typename _Duration2::rep>) /* strengthened */ {
return _Left.time_since_epoch() <=> _Right.time_since_epoch();
}
#endif // _HAS_CXX20
_EXPORT_STD template <class _To, class _Clock, class _Duration, enable_if_t<_Is_duration_v<_To>, int> = 0>
_NODISCARD constexpr time_point<_Clock, _To> time_point_cast(const time_point<_Clock, _Duration>& _Time)
noexcept(is_arithmetic_v<typename _Duration::rep> && is_arithmetic_v<typename _To::rep>) /* strengthened */ {
// change the duration type of a time_point; truncate
return time_point<_Clock, _To>(_CHRONO duration_cast<_To>(_Time.time_since_epoch()));
}
_EXPORT_STD template <class _To, class _Clock, class _Duration, enable_if_t<_Is_duration_v<_To>, int> = 0>
_NODISCARD constexpr time_point<_Clock, _To> floor(const time_point<_Clock, _Duration>& _Time)
noexcept(is_arithmetic_v<typename _Duration::rep> && is_arithmetic_v<typename _To::rep>) /* strengthened */ {
// change the duration type of a time_point; round towards negative infinity
return time_point<_Clock, _To>(_CHRONO floor<_To>(_Time.time_since_epoch()));
}
_EXPORT_STD template <class _To, class _Clock, class _Duration, enable_if_t<_Is_duration_v<_To>, int> = 0>
_NODISCARD constexpr time_point<_Clock, _To> ceil(const time_point<_Clock, _Duration>& _Time)
noexcept(is_arithmetic_v<typename _Duration::rep> && is_arithmetic_v<typename _To::rep>) /* strengthened */ {
// change the duration type of a time_point; round towards positive infinity
return time_point<_Clock, _To>(_CHRONO ceil<_To>(_Time.time_since_epoch()));
}
_EXPORT_STD template <class _To, class _Clock, class _Duration,
enable_if_t<_Is_duration_v<_To> && !treat_as_floating_point_v<typename _To::rep>, int> = 0>
_NODISCARD constexpr time_point<_Clock, _To> round(const time_point<_Clock, _Duration>& _Time)
noexcept(is_arithmetic_v<typename _Duration::rep> && is_arithmetic_v<typename _To::rep>) /* strengthened */ {
// change the duration type of a time_point; round to nearest, ties to even
return time_point<_Clock, _To>(_CHRONO round<_To>(_Time.time_since_epoch()));
}
_EXPORT_STD struct system_clock { // wraps GetSystemTimePreciseAsFileTime
using rep = long long;
using period = ratio<1, 10'000'000>; // 100 nanoseconds
using duration = _CHRONO duration<rep, period>;
using time_point = _CHRONO time_point<system_clock>;
static constexpr bool is_steady = false;
_NODISCARD static time_point now() noexcept { // get current time
return time_point(duration(_Xtime_get_ticks()));
}
_NODISCARD static __time64_t to_time_t(const time_point& _Time) noexcept { // convert to __time64_t
return duration_cast<seconds>(_Time.time_since_epoch()).count();
}
_NODISCARD static time_point from_time_t(__time64_t _Tm) noexcept { // convert from __time64_t
return time_point{seconds{_Tm}};
}
};
#if _HAS_CXX20
_EXPORT_STD template <class _Duration>
using sys_time = time_point<system_clock, _Duration>;
_EXPORT_STD using sys_seconds = sys_time<seconds>;
_EXPORT_STD using sys_days = sys_time<days>;
#endif // _HAS_CXX20
_EXPORT_STD struct steady_clock { // wraps QueryPerformanceCounter
using rep = long long;
using period = nano;
using duration = nanoseconds;
using time_point = _CHRONO time_point<steady_clock>;
static constexpr bool is_steady = true;
#if defined(_M_ARM) || defined(_M_ARM64) // vvv ARM or ARM64 arch vvv
#define _LIKELY_ARM_ARM64 _LIKELY
#define _LIKELY_X86_X64
#elif defined(_M_IX86) || defined(_M_X64) // ^^^ ARM or ARM64 arch / x86 or x64 arch vvv
#define _LIKELY_ARM_ARM64
#define _LIKELY_X86_X64 _LIKELY
#else // ^^^ x86 or x64 arch / other arch vvv
#define _LIKELY_ARM_ARM64
#define _LIKELY_X86_X64
#endif // ^^^ other arch ^^^
_NODISCARD static time_point now() noexcept { // get current time
const long long _Freq = _Query_perf_frequency(); // doesn't change after system boot
const long long _Ctr = _Query_perf_counter();
static_assert(period::num == 1, "This assumes period::num == 1.");
// The compiler recognizes the constants for frequency and time period and uses shifts and
// multiplies instead of divides to calculate the nanosecond value.
constexpr long long _TenMHz = 10'000'000;
constexpr long long _TwentyFourMHz = 24'000'000;
// clang-format off
if (_Freq == _TenMHz) _LIKELY_X86_X64 {
// 10 MHz is a very common QPC frequency on modern x86/x64 PCs. Optimizing for
// this specific frequency can double the performance of this function by
// avoiding the expensive frequency conversion path.
static_assert(period::den % _TenMHz == 0, "It should never fail.");
constexpr long long _Multiplier = period::den / _TenMHz;
return time_point(duration(_Ctr * _Multiplier));
} else if (_Freq == _TwentyFourMHz) _LIKELY_ARM_ARM64 {
// 24 MHz is a common frequency on ARM/ARM64, including cases where it emulates x86/x64.
const long long _Whole = (_Ctr / _TwentyFourMHz) * period::den;
const long long _Part = (_Ctr % _TwentyFourMHz) * period::den / _TwentyFourMHz;
return time_point(duration(_Whole + _Part));
} else {
// Instead of just having "(_Ctr * period::den) / _Freq",
// the algorithm below prevents overflow when _Ctr is sufficiently large.
// It assumes that _Freq * period::den does not overflow, which is currently true for nano period.
// It is not realistic for _Ctr to accumulate to large values from zero with this assumption,
// but the initial value of _Ctr could be large.
const long long _Whole = (_Ctr / _Freq) * period::den;
const long long _Part = (_Ctr % _Freq) * period::den / _Freq;
return time_point(duration(_Whole + _Part));
}
// clang-format on
}
#undef _LIKELY_ARM_ARM64
#undef _LIKELY_X86_X64
};
_EXPORT_STD using high_resolution_clock = steady_clock;
} // namespace chrono
inline namespace literals {
inline namespace chrono_literals {
_EXPORT_STD _NODISCARD constexpr _CHRONO hours operator""h(unsigned long long _Val) noexcept
/* strengthened */ {
return _CHRONO hours(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO duration<double, ratio<3600>> operator""h(long double _Val) noexcept
/* strengthened */ {
return _CHRONO duration<double, ratio<3600>>(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO minutes operator""min(unsigned long long _Val) noexcept
/* strengthened */ {
return _CHRONO minutes(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO duration<double, ratio<60>> operator""min(long double _Val) noexcept
/* strengthened */ {
return _CHRONO duration<double, ratio<60>>(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO seconds operator""s(unsigned long long _Val) noexcept
/* strengthened */ {
return _CHRONO seconds(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO duration<double> operator""s(long double _Val) noexcept
/* strengthened */ {
return _CHRONO duration<double>(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO milliseconds operator""ms(unsigned long long _Val) noexcept
/* strengthened */ {
return _CHRONO milliseconds(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO duration<double, milli> operator""ms(long double _Val) noexcept
/* strengthened */ {
return _CHRONO duration<double, milli>(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO microseconds operator""us(unsigned long long _Val) noexcept
/* strengthened */ {
return _CHRONO microseconds(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO duration<double, micro> operator""us(long double _Val) noexcept
/* strengthened */ {
return _CHRONO duration<double, micro>(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO nanoseconds operator""ns(unsigned long long _Val) noexcept
/* strengthened */ {
return _CHRONO nanoseconds(_Val);
}
_EXPORT_STD _NODISCARD constexpr _CHRONO duration<double, nano> operator""ns(long double _Val) noexcept
/* strengthened */ {
return _CHRONO duration<double, nano>(_Val);
}
} // namespace chrono_literals
} // namespace literals
namespace chrono {
_EXPORT_STD using namespace literals::chrono_literals;
} // namespace chrono
_STD_END
#pragma pop_macro("new")
_STL_RESTORE_CLANG_WARNINGS
#pragma warning(pop)
#pragma pack(pop)
#endif // _STL_COMPILER_PREPROCESSOR
#endif // __MSVC_CHRONO_HPP
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