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STL/stl/inc/chrono

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// chrono standard header
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#pragma once
#ifndef _CHRONO_
#define _CHRONO_
#include <yvals_core.h>
#if _STL_COMPILER_PREPROCESSOR
#include <limits>
#include <ratio>
#include <time.h>
#include <utility>
#include <xatomic.h>
#include <xtimec.h>
#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 {
// STRUCT TEMPLATE treat_as_floating_point
template <class _Rep>
struct treat_as_floating_point : is_floating_point<_Rep> { // tests for floating-point type
};
template <class _Rep>
_INLINE_VAR constexpr bool treat_as_floating_point_v = treat_as_floating_point<_Rep>::value;
// STRUCT TEMPLATE duration_values
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)();
}
};
// CLASS TEMPLATE duration
template <class _Rep, class _Period = ratio<1>>
class duration;
// VARIABLE TEMPLATE _Is_duration_v
template <class _Ty>
_INLINE_VAR constexpr bool _Is_duration_v = _Is_specialization_v<_Ty, duration>;
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
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
};
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>, "duration must be an instance of std::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;
}
_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
// STRUCT TEMPLATE _Lcm (LEAST COMMON MULTIPLE)
template <intmax_t _Ax, intmax_t _Bx>
struct _Lcm
: integral_constant<intmax_t, (_Ax / _Gcd<_Ax, _Bx>::value) * _Bx> { // compute least common multiple of _Ax and _Bx
};
// STRUCT TEMPLATE common_type SPECIALIZATIONS
template <class _Rep1, class _Period1, class _Rep2, class _Period2>
struct common_type<chrono::duration<_Rep1, _Period1>,
chrono::duration<_Rep2, _Period2>> { // common type of two durations
using type = chrono::duration<common_type_t<_Rep1, _Rep2>,
ratio<_Gcd<_Period1::num, _Period2::num>::value, _Lcm<_Period1::den, _Period2::den>::value>>;
};
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 {
// duration ARITHMETIC
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());
}
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());
}
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);
}
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
};
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);
}
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();
}
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);
}
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());
}
// duration COMPARISONS
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();
}
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);
}
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();
}
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);
}
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;
}
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);
}
// FUNCTION TEMPLATE duration_cast
template <class _To, class _Rep, class _Period, enable_if_t<_Is_duration_v<_To>, int> _Enabled>
_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 (_Den_is_one) {
if (_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 (_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)));
}
}
}
// FUNCTION TEMPLATE floor
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;
}
// FUNCTION TEMPLATE ceil
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;
}
// FUNCTION TEMPLATE round
template <class _Rep>
constexpr bool _Is_even(_Rep _Val) noexcept(is_arithmetic_v<_Rep>) /* strengthened */ {
// Tests whether _Val is even
return _Val % 2 == 0;
}
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;
}
// FUNCTION TEMPLATE abs
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 with count() the absolute value of _Dur.count()
return _Dur < duration<_Rep, _Period>::zero() ? duration<_Rep, _Period>::zero() - _Dur : _Dur;
}
// duration TYPES
using nanoseconds = duration<long long, nano>;
using microseconds = duration<long long, micro>;
using milliseconds = duration<long long, milli>;
using seconds = duration<long long>;
using minutes = duration<int, ratio<60>>;
using hours = duration<int, ratio<3600>>;
// time_point ARITHMETIC
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);
}
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;
}
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);
}
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();
}
// time_point COMPARISONS
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();
}
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);
}
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();
}
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);
}
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;
}
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);
}
// FUNCTION TEMPLATE time_point_cast
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()));
}
// FUNCTION TEMPLATE floor (for time_point instances)
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()));
}
// FUNCTION TEMPLATE ceil (for time_point instances)
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()));
}
// FUNCTION TEMPLATE round (for time_point instances)
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()));
}
// CLOCKS
struct system_clock { // wraps GetSystemTimePreciseAsFileTime/GetSystemTimeAsFileTime
using rep = long long;
using period = ratio_multiply<ratio<_XTIME_NSECS_PER_TICK, 1>, nano>;
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 static_cast<__time64_t>(_Time.time_since_epoch().count() / _XTIME_TICKS_PER_TIME_T);
}
_NODISCARD static time_point from_time_t(__time64_t _Tm) noexcept { // convert from __time64_t
return time_point(duration(_Tm * _XTIME_TICKS_PER_TIME_T));
}
};
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;
_NODISCARD static time_point now() noexcept { // get current time
#if (defined(_M_IX86) || defined(_M_X64) || defined(_M_ARM) || defined(_M_ARM64)) && !defined(_M_CEE_PURE)
// Implement atomics avoiding <atomic> header dependency
static volatile long long _Cached_freq = LLONG_MAX;
static volatile long long _Cached_ctr_base = LLONG_MAX;
static volatile long long _Cached_result_base = LLONG_MAX;
const long long _Freq_from_cache = _Atomic_load_ll_relaxed(&_Cached_freq);
const long long _Ctr_base = _Atomic_load_ll_relaxed(&_Cached_ctr_base);
const long long _Result_base = _Atomic_load_ll_relaxed(&_Cached_result_base);
if (_Freq_from_cache != LLONG_MAX && _Ctr_base != LLONG_MAX && _Result_base != LLONG_MAX) {
// Fast path
const long long _Ctr = _Query_perf_counter();
return time_point(duration(_Result_base + (_Ctr - _Ctr_base) * period::den / _Freq_from_cache));
}
// Calculate with two divisions to prevent overflow
const long long _Freq = _Query_perf_frequency();
const long long _Ctr = _Query_perf_counter();
const long long _Result = _Scale_large_counter(_Ctr, _Freq);
if (_Atomic_compare_exchange_strong_ll_seq_cst(&_Cached_freq, _Freq, LLONG_MAX)) {
// This is the first result, save current result as base for fast path
_Atomic_compare_exchange_strong_ll_seq_cst(&_Cached_ctr_base, _Ctr, LLONG_MAX);
_Atomic_compare_exchange_strong_ll_seq_cst(&_Cached_result_base, _Result, LLONG_MAX);
}
// if _Result is not saved as first, it is still compatible with fast result
return time_point(duration(_Result));
#else // ^^^ known hardware && !defined(_M_CEE_PURE) / unknown hardware || defined(_M_CEE_PURE) vvv
const long long _Freq = _Query_perf_frequency(); // doesn't change after system boot
const long long _Ctr = _Query_perf_counter();
return time_point(duration(_Scale_large_counter(_Ctr, _Freq)));
#endif // (defined(_M_IX86) || defined(_M_X64) || defined(_M_ARM) || defined(_M_ARM64)) && !defined(_M_CEE_PURE)
}
private:
_NODISCARD static long long _Scale_large_counter(const long long _Ctr, const long long _Freq) noexcept {
static_assert(period::num == 1, "This assumes period::num == 1.");
// 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 _Whole + _Part;
}
};
using high_resolution_clock = steady_clock;
} // namespace chrono
// HELPERS
template <class _Rep, class _Period>
_NODISCARD bool _To_xtime_10_day_clamped(_CSTD xtime& _Xt, const chrono::duration<_Rep, _Period>& _Rel_time) noexcept(
is_arithmetic_v<_Rep>) {
// Convert duration to xtime, maximum 10 days from now, returns whether clamping occurred.
// If clamped, timeouts will be transformed into spurious non-timeout wakes, due to ABI restrictions where
// the other side of the DLL boundary overflows int32_t milliseconds.
// Every function calling this one is TRANSITION, ABI
constexpr chrono::nanoseconds _Ten_days{chrono::hours{24} * 10};
constexpr chrono::duration<double> _Ten_days_d{_Ten_days};
chrono::nanoseconds _T0 = chrono::system_clock::now().time_since_epoch();
const bool _Clamped = _Ten_days_d < _Rel_time;
if (_Clamped) {
_T0 += _Ten_days;
} else {
_T0 += chrono::duration_cast<chrono::nanoseconds>(_Rel_time);
}
const auto _Whole_seconds = chrono::duration_cast<chrono::seconds>(_T0);
_Xt.sec = _Whole_seconds.count();
_T0 -= _Whole_seconds;
_Xt.nsec = static_cast<long>(_T0.count());
return _Clamped;
}
// duration LITERALS
inline namespace literals {
inline namespace chrono_literals {
_NODISCARD constexpr chrono::hours operator"" h(unsigned long long _Val) noexcept /* strengthened */ {
return chrono::hours(_Val);
}
_NODISCARD constexpr chrono::duration<double, ratio<3600>> operator"" h(long double _Val) noexcept
/* strengthened */ {
return chrono::duration<double, ratio<3600>>(_Val);
}
_NODISCARD constexpr chrono::minutes(operator"" min)(unsigned long long _Val) noexcept /* strengthened */ {
return chrono::minutes(_Val);
}
_NODISCARD constexpr chrono::duration<double, ratio<60>>(operator"" min)(long double _Val) noexcept
/* strengthened */ {
return chrono::duration<double, ratio<60>>(_Val);
}
_NODISCARD constexpr chrono::seconds operator"" s(unsigned long long _Val) noexcept /* strengthened */ {
return chrono::seconds(_Val);
}
_NODISCARD constexpr chrono::duration<double> operator"" s(long double _Val) noexcept /* strengthened */ {
return chrono::duration<double>(_Val);
}
_NODISCARD constexpr chrono::milliseconds operator"" ms(unsigned long long _Val) noexcept /* strengthened */ {
return chrono::milliseconds(_Val);
}
_NODISCARD constexpr chrono::duration<double, milli> operator"" ms(long double _Val) noexcept
/* strengthened */ {
return chrono::duration<double, milli>(_Val);
}
_NODISCARD constexpr chrono::microseconds operator"" us(unsigned long long _Val) noexcept /* strengthened */ {
return chrono::microseconds(_Val);
}
_NODISCARD constexpr chrono::duration<double, micro> operator"" us(long double _Val) noexcept
/* strengthened */ {
return chrono::duration<double, micro>(_Val);
}
_NODISCARD constexpr chrono::nanoseconds operator"" ns(unsigned long long _Val) noexcept /* strengthened */ {
return chrono::nanoseconds(_Val);
}
_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 {
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 // _CHRONO_
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