|  | // -*- C++ -*- | 
|  | //===----------------------------------------------------------------------===// | 
|  | // | 
|  | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | 
|  | // See https://llvm.org/LICENSE.txt for license information. | 
|  | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | 
|  | // | 
|  | //===----------------------------------------------------------------------===// | 
|  |  | 
|  | #ifndef _LIBCPP___CXX03_CHRONO | 
|  | #define _LIBCPP___CXX03_CHRONO | 
|  |  | 
|  | // clang-format off | 
|  |  | 
|  | /* | 
|  | chrono synopsis | 
|  |  | 
|  | #include <__cxx03/compare> // C++20 | 
|  |  | 
|  | namespace std | 
|  | { | 
|  | namespace chrono | 
|  | { | 
|  |  | 
|  | template <class ToDuration, class Rep, class Period> | 
|  | constexpr | 
|  | ToDuration | 
|  | duration_cast(const duration<Rep, Period>& fd); | 
|  |  | 
|  | template <class Rep> struct treat_as_floating_point : is_floating_point<Rep> {}; | 
|  |  | 
|  | template <class Rep> inline constexpr bool treat_as_floating_point_v | 
|  | = treat_as_floating_point<Rep>::value;                       // C++17 | 
|  |  | 
|  | template <class Rep> | 
|  | struct duration_values | 
|  | { | 
|  | public: | 
|  | static constexpr Rep zero(); // noexcept in C++20 | 
|  | static constexpr Rep max();  // noexcept in C++20 | 
|  | static constexpr Rep min();  // noexcept in C++20 | 
|  | }; | 
|  |  | 
|  | // duration | 
|  |  | 
|  | template <class Rep, class Period = ratio<1>> | 
|  | class duration | 
|  | { | 
|  | static_assert(!__is_duration<Rep>::value, "A duration representation can not be a duration"); | 
|  | static_assert(__is_ratio<Period>::value, "Second template parameter of duration must be a std::ratio"); | 
|  | static_assert(Period::num > 0, "duration period must be positive"); | 
|  | public: | 
|  | typedef Rep rep; | 
|  | typedef typename _Period::type period; | 
|  |  | 
|  | constexpr duration() = default; | 
|  | template <class Rep2> | 
|  | constexpr explicit duration(const Rep2& r, | 
|  | typename enable_if | 
|  | < | 
|  | is_convertible<const Rep2&, rep>::value && | 
|  | (treat_as_floating_point<rep>::value || | 
|  | !treat_as_floating_point<rep>::value && !treat_as_floating_point<Rep2>::value) | 
|  | >::type* = 0); | 
|  |  | 
|  | // conversions | 
|  | template <class Rep2, class Period2> | 
|  | constexpr duration(const duration<Rep2, Period2>& d, | 
|  | typename enable_if | 
|  | < | 
|  | treat_as_floating_point<rep>::value || | 
|  | ratio_divide<Period2, period>::type::den == 1 | 
|  | >::type* = 0); | 
|  |  | 
|  | // observer | 
|  |  | 
|  | constexpr rep count() const; | 
|  |  | 
|  | // arithmetic | 
|  |  | 
|  | constexpr common_type<duration>::type  operator+() const; | 
|  | constexpr common_type<duration>::type  operator-() const; | 
|  | constexpr duration& operator++();    // constexpr in C++17 | 
|  | constexpr duration  operator++(int); // constexpr in C++17 | 
|  | constexpr duration& operator--();    // constexpr in C++17 | 
|  | constexpr duration  operator--(int); // constexpr in C++17 | 
|  |  | 
|  | constexpr duration& operator+=(const duration& d);  // constexpr in C++17 | 
|  | constexpr duration& operator-=(const duration& d);  // constexpr in C++17 | 
|  |  | 
|  | duration& operator*=(const rep& rhs);       // constexpr in C++17 | 
|  | duration& operator/=(const rep& rhs);       // constexpr in C++17 | 
|  | duration& operator%=(const rep& rhs);       // constexpr in C++17 | 
|  | duration& operator%=(const duration& rhs);  // constexpr in C++17 | 
|  |  | 
|  | // special values | 
|  |  | 
|  | static constexpr duration zero(); // noexcept in C++20 | 
|  | static constexpr duration min();  // noexcept in C++20 | 
|  | static constexpr duration max();  // noexcept in C++20 | 
|  | }; | 
|  |  | 
|  | typedef duration<long long,         nano> nanoseconds; | 
|  | typedef duration<long long,        micro> microseconds; | 
|  | typedef duration<long long,        milli> milliseconds; | 
|  | typedef duration<long long              > seconds; | 
|  | typedef duration<     long, ratio<  60> > minutes; | 
|  | typedef duration<     long, ratio<3600> > hours; | 
|  |  | 
|  | template <class Clock, class Duration = typename Clock::duration> | 
|  | class time_point | 
|  | { | 
|  | public: | 
|  | typedef Clock                     clock; | 
|  | typedef Duration                  duration; | 
|  | typedef typename duration::rep    rep; | 
|  | typedef typename duration::period period; | 
|  | private: | 
|  | duration d_;  // exposition only | 
|  |  | 
|  | public: | 
|  | time_point();  // has value "epoch" // constexpr in C++14 | 
|  | explicit time_point(const duration& d);  // same as time_point() + d // constexpr in C++14 | 
|  |  | 
|  | // conversions | 
|  | template <class Duration2> | 
|  | time_point(const time_point<clock, Duration2>& t); // constexpr in C++14 | 
|  |  | 
|  | // observer | 
|  |  | 
|  | duration time_since_epoch() const; // constexpr in C++14 | 
|  |  | 
|  | // arithmetic | 
|  |  | 
|  | time_point& operator+=(const duration& d); // constexpr in C++17 | 
|  | time_point& operator-=(const duration& d); // constexpr in C++17 | 
|  |  | 
|  | // special values | 
|  |  | 
|  | static constexpr time_point min();  // noexcept in C++20 | 
|  | static constexpr time_point max();  // noexcept in C++20 | 
|  | }; | 
|  |  | 
|  | } // chrono | 
|  |  | 
|  | // common_type traits | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | struct common_type<chrono::duration<Rep1, Period1>, chrono::duration<Rep2, Period2>>; | 
|  |  | 
|  | template <class Clock, class Duration1, class Duration2> | 
|  | struct common_type<chrono::time_point<Clock, Duration1>, chrono::time_point<Clock, Duration2>>; | 
|  |  | 
|  | namespace chrono { | 
|  |  | 
|  | // duration arithmetic | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | typename common_type<duration<Rep1, Period1>, duration<Rep2, Period2>>::type | 
|  | operator+(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | typename common_type<duration<Rep1, Period1>, duration<Rep2, Period2>>::type | 
|  | operator-(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template <class Rep1, class Period, class Rep2> | 
|  | constexpr | 
|  | duration<typename common_type<Rep1, Rep2>::type, Period> | 
|  | operator*(const duration<Rep1, Period>& d, const Rep2& s); | 
|  | template <class Rep1, class Period, class Rep2> | 
|  | constexpr | 
|  | duration<typename common_type<Rep1, Rep2>::type, Period> | 
|  | operator*(const Rep1& s, const duration<Rep2, Period>& d); | 
|  | template <class Rep1, class Period, class Rep2> | 
|  | constexpr | 
|  | duration<typename common_type<Rep1, Rep2>::type, Period> | 
|  | operator/(const duration<Rep1, Period>& d, const Rep2& s); | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | typename common_type<Rep1, Rep2>::type | 
|  | operator/(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  |  | 
|  | // duration comparisons | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | bool operator==(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | bool operator!=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); // removed in C++20 | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | bool operator< (const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | bool operator<=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | bool operator> (const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template <class Rep1, class Period1, class Rep2, class Period2> | 
|  | constexpr | 
|  | bool operator>=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template<class Rep1, class Period1, class Rep2, class Period2> | 
|  | requires three_way_comparable<typename CT::rep> | 
|  | constexpr auto operator<=>(const duration<Rep1, Period1>& lhs, | 
|  | const duration<Rep2, Period2>& rhs);                           // since C++20 | 
|  |  | 
|  | // duration_cast | 
|  | template <class ToDuration, class Rep, class Period> | 
|  | ToDuration duration_cast(const duration<Rep, Period>& d); | 
|  |  | 
|  | template <class ToDuration, class Rep, class Period> | 
|  | constexpr ToDuration floor(const duration<Rep, Period>& d);    // C++17 | 
|  | template <class ToDuration, class Rep, class Period> | 
|  | constexpr ToDuration ceil(const duration<Rep, Period>& d);     // C++17 | 
|  | template <class ToDuration, class Rep, class Period> | 
|  | constexpr ToDuration round(const duration<Rep, Period>& d);    // C++17 | 
|  |  | 
|  | // duration I/O | 
|  | template<class charT, class traits, class Rep, class Period>       // C++20 | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, | 
|  | const duration<Rep, Period>& d); | 
|  |  | 
|  | // time_point arithmetic (all constexpr in C++14) | 
|  | template <class Clock, class Duration1, class Rep2, class Period2> | 
|  | time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type> | 
|  | operator+(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template <class Rep1, class Period1, class Clock, class Duration2> | 
|  | time_point<Clock, typename common_type<duration<Rep1, Period1>, Duration2>::type> | 
|  | operator+(const duration<Rep1, Period1>& lhs, const time_point<Clock, Duration2>& rhs); | 
|  | template <class Clock, class Duration1, class Rep2, class Period2> | 
|  | time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type> | 
|  | operator-(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs); | 
|  | template <class Clock, class Duration1, class Duration2> | 
|  | typename common_type<Duration1, Duration2>::type | 
|  | operator-(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs); | 
|  |  | 
|  | // time_point comparisons (all constexpr in C++14) | 
|  | template <class Clock, class Duration1, class Duration2> | 
|  | bool operator==(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs); | 
|  | template <class Clock, class Duration1, class Duration2> | 
|  | bool operator!=(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs); // removed in C++20 | 
|  | template <class Clock, class Duration1, class Duration2> | 
|  | bool operator< (const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs); | 
|  | template <class Clock, class Duration1, class Duration2> | 
|  | bool operator<=(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs); | 
|  | template <class Clock, class Duration1, class Duration2> | 
|  | bool operator> (const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs); | 
|  | template <class Clock, class Duration1, class Duration2> | 
|  | bool operator>=(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs); | 
|  | template<class Clock, class Duration1, | 
|  | three_way_comparable_with<Duration1> Duration2> | 
|  | constexpr auto operator<=>(const time_point<Clock, Duration1>& lhs, | 
|  | const time_point<Clock, Duration2>& rhs);                                // since C++20 | 
|  |  | 
|  | // time_point_cast (constexpr in C++14) | 
|  |  | 
|  | template <class ToDuration, class Clock, class Duration> | 
|  | time_point<Clock, ToDuration> time_point_cast(const time_point<Clock, Duration>& t); | 
|  |  | 
|  | template <class ToDuration, class Clock, class Duration> | 
|  | constexpr time_point<Clock, ToDuration> | 
|  | floor(const time_point<Clock, Duration>& tp);                  // C++17 | 
|  |  | 
|  | template <class ToDuration, class Clock, class Duration> | 
|  | constexpr time_point<Clock, ToDuration> | 
|  | ceil(const time_point<Clock, Duration>& tp);                   // C++17 | 
|  |  | 
|  | template <class ToDuration, class Clock, class Duration> | 
|  | constexpr time_point<Clock, ToDuration> | 
|  | round(const time_point<Clock, Duration>& tp);                  // C++17 | 
|  |  | 
|  | template <class Rep, class Period> | 
|  | constexpr duration<Rep, Period> abs(duration<Rep, Period> d);  // C++17 | 
|  |  | 
|  | // Clocks | 
|  |  | 
|  | class system_clock | 
|  | { | 
|  | public: | 
|  | typedef microseconds                     duration; | 
|  | typedef duration::rep                    rep; | 
|  | typedef duration::period                 period; | 
|  | typedef chrono::time_point<system_clock> time_point; | 
|  | static const bool is_steady =            false; // constexpr in C++14 | 
|  |  | 
|  | static time_point now() noexcept; | 
|  | static time_t     to_time_t  (const time_point& __t) noexcept; | 
|  | static time_point from_time_t(time_t __t) noexcept; | 
|  | }; | 
|  |  | 
|  | template <class Duration> | 
|  | using sys_time  = time_point<system_clock, Duration>; // C++20 | 
|  | using sys_seconds = sys_time<seconds>;                  // C++20 | 
|  | using sys_days    = sys_time<days>;                     // C++20 | 
|  |  | 
|  | template<class charT, class traits, class Duration>     // C++20 | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const sys_time<Duration>& tp); | 
|  |  | 
|  | template<class charT, class traits>                    // C++20 | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const sys_days& dp); | 
|  |  | 
|  | class file_clock                                        // C++20 | 
|  | { | 
|  | public: | 
|  | typedef see-below                      rep; | 
|  | typedef nano                           period; | 
|  | typedef chrono::duration<rep, period>  duration; | 
|  | typedef chrono::time_point<file_clock> time_point; | 
|  | static constexpr bool is_steady =      false; | 
|  |  | 
|  | static time_point now() noexcept; | 
|  |  | 
|  | template<class Duration> | 
|  | static sys_time<see-below> to_sys(const file_time<Duration>&); | 
|  |  | 
|  | template<class Duration> | 
|  | static file_time<see-below> from_sys(const sys_time<Duration>&); | 
|  | }; | 
|  |  | 
|  | template<class Duration> | 
|  | using file_time = time_point<file_clock, Duration>;   // C++20 | 
|  |  | 
|  | template<class charT, class traits, class Duration>     // C++20 | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const file_time<Duration>& tp); | 
|  |  | 
|  | class steady_clock | 
|  | { | 
|  | public: | 
|  | typedef nanoseconds                                   duration; | 
|  | typedef duration::rep                                 rep; | 
|  | typedef duration::period                              period; | 
|  | typedef chrono::time_point<steady_clock, duration>    time_point; | 
|  | static const bool is_steady =                         true; // constexpr in C++14 | 
|  |  | 
|  | static time_point now() noexcept; | 
|  | }; | 
|  |  | 
|  | typedef steady_clock high_resolution_clock; | 
|  |  | 
|  | // 25.7.8, local time           // C++20 | 
|  | struct local_t {}; | 
|  | template<class Duration> | 
|  | using local_time  = time_point<local_t, Duration>; | 
|  | using local_seconds = local_time<seconds>; | 
|  | using local_days    = local_time<days>; | 
|  |  | 
|  | template<class charT, class traits, class Duration>     // C++20 | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const local_time<Duration>& tp); | 
|  |  | 
|  | // 25.8.2, class last_spec    // C++20 | 
|  | struct last_spec; | 
|  |  | 
|  | // 25.8.3, class day          // C++20 | 
|  |  | 
|  | class day; | 
|  | constexpr bool operator==(const day& x, const day& y) noexcept; | 
|  | constexpr strong_ordering operator<=>(const day& x, const day& y) noexcept; | 
|  | constexpr day  operator+(const day&  x, const days& y) noexcept; | 
|  | constexpr day  operator+(const days& x, const day&  y) noexcept; | 
|  | constexpr day  operator-(const day&  x, const days& y) noexcept; | 
|  | constexpr days operator-(const day&  x, const day&  y) noexcept; | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const day& d); | 
|  |  | 
|  | // 25.8.4, class month    // C++20 | 
|  | class month; | 
|  | constexpr bool operator==(const month& x, const month& y) noexcept; | 
|  | constexpr strong_ordering operator<=>(const month& x, const month& y) noexcept; | 
|  |  | 
|  | constexpr month  operator+(const month&  x, const months& y) noexcept; | 
|  | constexpr month  operator+(const months& x,  const month& y) noexcept; | 
|  | constexpr month  operator-(const month&  x, const months& y) noexcept; | 
|  | constexpr months operator-(const month&  x,  const month& y) noexcept; | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const month& m); | 
|  |  | 
|  | // 25.8.5, class year    // C++20 | 
|  | class year; | 
|  | constexpr bool operator==(const year& x, const year& y) noexcept; | 
|  | constexpr strong_ordering operator<=>(const year& x, const year& y) noexcept; | 
|  |  | 
|  | constexpr year  operator+(const year&  x, const years& y) noexcept; | 
|  | constexpr year  operator+(const years& x, const year&  y) noexcept; | 
|  | constexpr year  operator-(const year&  x, const years& y) noexcept; | 
|  | constexpr years operator-(const year&  x, const year&  y) noexcept; | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const year& y); | 
|  |  | 
|  | // 25.8.6, class weekday    // C++20 | 
|  | class weekday; | 
|  |  | 
|  | constexpr bool operator==(const weekday& x, const weekday& y) noexcept; | 
|  | constexpr weekday operator+(const weekday& x, const days&    y) noexcept; | 
|  | constexpr weekday operator+(const days&    x, const weekday& y) noexcept; | 
|  | constexpr weekday operator-(const weekday& x, const days&    y) noexcept; | 
|  | constexpr days    operator-(const weekday& x, const weekday& y) noexcept; | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const weekday& wd); | 
|  |  | 
|  | // 25.8.7, class weekday_indexed    // C++20 | 
|  |  | 
|  | class weekday_indexed; | 
|  | constexpr bool operator==(const weekday_indexed& x, const weekday_indexed& y) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const weekday_indexed& wdi); | 
|  |  | 
|  | // 25.8.8, class weekday_last    // C++20 | 
|  | class weekday_last; | 
|  |  | 
|  | constexpr bool operator==(const weekday_last& x, const weekday_last& y) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const weekday_last& wdl); | 
|  |  | 
|  | // 25.8.9, class month_day    // C++20 | 
|  | class month_day; | 
|  |  | 
|  | constexpr bool operator==(const month_day& x, const month_day& y) noexcept; | 
|  | constexpr strong_ordering operator<=>(const month_day& x, const month_day& y) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const month_day& md); | 
|  |  | 
|  | // 25.8.10, class month_day_last    // C++20 | 
|  | class month_day_last; | 
|  |  | 
|  | constexpr bool operator==(const month_day_last& x, const month_day_last& y) noexcept; | 
|  | constexpr strong_ordering operator<=>(const month_day_last& x, const month_day_last& y) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const month_day_last& mdl); | 
|  |  | 
|  | // 25.8.11, class month_weekday    // C++20 | 
|  | class month_weekday; | 
|  |  | 
|  | constexpr bool operator==(const month_weekday& x, const month_weekday& y) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const month_weekday& mwd); | 
|  |  | 
|  | // 25.8.12, class month_weekday_last    // C++20 | 
|  | class month_weekday_last; | 
|  |  | 
|  | constexpr bool operator==(const month_weekday_last& x, const month_weekday_last& y) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const month_weekday_last& mwdl); | 
|  |  | 
|  |  | 
|  | // 25.8.13, class year_month    // C++20 | 
|  | class year_month; | 
|  |  | 
|  | constexpr bool operator==(const year_month& x, const year_month& y) noexcept; | 
|  | constexpr strong_ordering operator<=>(const year_month& x, const year_month& y) noexcept; | 
|  |  | 
|  | constexpr year_month operator+(const year_month& ym, const months& dm) noexcept; | 
|  | constexpr year_month operator+(const months& dm, const year_month& ym) noexcept; | 
|  | constexpr year_month operator-(const year_month& ym, const months& dm) noexcept; | 
|  | constexpr months operator-(const year_month& x, const year_month& y) noexcept; | 
|  | constexpr year_month operator+(const year_month& ym, const years& dy) noexcept; | 
|  | constexpr year_month operator+(const years& dy, const year_month& ym) noexcept; | 
|  | constexpr year_month operator-(const year_month& ym, const years& dy) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const year_month& ym); | 
|  |  | 
|  | // 25.8.14, class year_month_day class    // C++20 | 
|  | year_month_day; | 
|  |  | 
|  | constexpr bool operator==(const year_month_day& x, const year_month_day& y) noexcept; | 
|  | constexpr strong_ordering operator<=>(const year_month_day& x, const year_month_day& y) noexcept; | 
|  |  | 
|  | constexpr year_month_day operator+(const year_month_day& ymd, const months& dm) noexcept; | 
|  | constexpr year_month_day operator+(const months& dm, const year_month_day& ymd) noexcept; | 
|  | constexpr year_month_day operator+(const year_month_day& ymd, const years& dy) noexcept; | 
|  | constexpr year_month_day operator+(const years& dy, const year_month_day& ymd) noexcept; | 
|  | constexpr year_month_day operator-(const year_month_day& ymd, const months& dm) noexcept; | 
|  | constexpr year_month_day operator-(const year_month_day& ymd, const years& dy) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const year_month_day& ymd); | 
|  |  | 
|  | // 25.8.15, class year_month_day_last    // C++20 | 
|  | class year_month_day_last; | 
|  |  | 
|  | constexpr bool operator==(const year_month_day_last& x, const year_month_day_last& y) noexcept; | 
|  | constexpr strong_ordering operator<=>(const year_month_day_last_day& x, const year_month_day_last_day& y) noexcept; | 
|  |  | 
|  | constexpr year_month_day_last | 
|  | operator+(const year_month_day_last& ymdl, const months& dm) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator+(const months& dm, const year_month_day_last& ymdl) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator+(const year_month_day_last& ymdl, const years& dy) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator+(const years& dy, const year_month_day_last& ymdl) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator-(const year_month_day_last& ymdl, const months& dm) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator-(const year_month_day_last& ymdl, const years& dy) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const year_month_day_last& ymdl); | 
|  |  | 
|  | // 25.8.16, class year_month_weekday    // C++20 | 
|  | class year_month_weekday; | 
|  |  | 
|  | constexpr bool operator==(const year_month_weekday& x, | 
|  | const year_month_weekday& y) noexcept; | 
|  |  | 
|  | constexpr year_month_weekday | 
|  | operator+(const year_month_weekday& ymwd, const months& dm) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator+(const months& dm, const year_month_weekday& ymwd) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator+(const year_month_weekday& ymwd, const years& dy) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator+(const years& dy, const year_month_weekday& ymwd) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator-(const year_month_weekday& ymwd, const months& dm) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator-(const year_month_weekday& ymwd, const years& dy) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const year_month_weekday& ymwd); | 
|  |  | 
|  | // 25.8.17, class year_month_weekday_last    // C++20 | 
|  | class year_month_weekday_last; | 
|  |  | 
|  | constexpr bool operator==(const year_month_weekday_last& x, | 
|  | const year_month_weekday_last& y) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator+(const year_month_weekday_last& ymwdl, const months& dm) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator+(const months& dm, const year_month_weekday_last& ymwdl) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator+(const year_month_weekday_last& ymwdl, const years& dy) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator+(const years& dy, const year_month_weekday_last& ymwdl) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator-(const year_month_weekday_last& ymwdl, const months& dm) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator-(const year_month_weekday_last& ymwdl, const years& dy) noexcept; | 
|  |  | 
|  | template<class charT, class traits> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const year_month_weekday_last& ymwdl); | 
|  |  | 
|  | // 25.8.18, civil calendar conventional syntax operators    // C++20 | 
|  | constexpr year_month | 
|  | operator/(const year& y, const month& m) noexcept; | 
|  | constexpr year_month | 
|  | operator/(const year& y, int m) noexcept; | 
|  | constexpr month_day | 
|  | operator/(const month& m, const day& d) noexcept; | 
|  | constexpr month_day | 
|  | operator/(const month& m, int d) noexcept; | 
|  | constexpr month_day | 
|  | operator/(int m, const day& d) noexcept; | 
|  | constexpr month_day | 
|  | operator/(const day& d, const month& m) noexcept; | 
|  | constexpr month_day | 
|  | operator/(const day& d, int m) noexcept; | 
|  | constexpr month_day_last | 
|  | operator/(const month& m, last_spec) noexcept; | 
|  | constexpr month_day_last | 
|  | operator/(int m, last_spec) noexcept; | 
|  | constexpr month_day_last | 
|  | operator/(last_spec, const month& m) noexcept; | 
|  | constexpr month_day_last | 
|  | operator/(last_spec, int m) noexcept; | 
|  | constexpr month_weekday | 
|  | operator/(const month& m, const weekday_indexed& wdi) noexcept; | 
|  | constexpr month_weekday | 
|  | operator/(int m, const weekday_indexed& wdi) noexcept; | 
|  | constexpr month_weekday | 
|  | operator/(const weekday_indexed& wdi, const month& m) noexcept; | 
|  | constexpr month_weekday | 
|  | operator/(const weekday_indexed& wdi, int m) noexcept; | 
|  | constexpr month_weekday_last | 
|  | operator/(const month& m, const weekday_last& wdl) noexcept; | 
|  | constexpr month_weekday_last | 
|  | operator/(int m, const weekday_last& wdl) noexcept; | 
|  | constexpr month_weekday_last | 
|  | operator/(const weekday_last& wdl, const month& m) noexcept; | 
|  | constexpr month_weekday_last | 
|  | operator/(const weekday_last& wdl, int m) noexcept; | 
|  | constexpr year_month_day | 
|  | operator/(const year_month& ym, const day& d) noexcept; | 
|  | constexpr year_month_day | 
|  | operator/(const year_month& ym, int d) noexcept; | 
|  | constexpr year_month_day | 
|  | operator/(const year& y, const month_day& md) noexcept; | 
|  | constexpr year_month_day | 
|  | operator/(int y, const month_day& md) noexcept; | 
|  | constexpr year_month_day | 
|  | operator/(const month_day& md, const year& y) noexcept; | 
|  | constexpr year_month_day | 
|  | operator/(const month_day& md, int y) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator/(const year_month& ym, last_spec) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator/(const year& y, const month_day_last& mdl) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator/(int y, const month_day_last& mdl) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator/(const month_day_last& mdl, const year& y) noexcept; | 
|  | constexpr year_month_day_last | 
|  | operator/(const month_day_last& mdl, int y) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator/(const year_month& ym, const weekday_indexed& wdi) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator/(const year& y, const month_weekday& mwd) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator/(int y, const month_weekday& mwd) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator/(const month_weekday& mwd, const year& y) noexcept; | 
|  | constexpr year_month_weekday | 
|  | operator/(const month_weekday& mwd, int y) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator/(const year_month& ym, const weekday_last& wdl) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator/(const year& y, const month_weekday_last& mwdl) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator/(int y, const month_weekday_last& mwdl) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator/(const month_weekday_last& mwdl, const year& y) noexcept; | 
|  | constexpr year_month_weekday_last | 
|  | operator/(const month_weekday_last& mwdl, int y) noexcept; | 
|  |  | 
|  | // 26.9, class template hh_mm_ss | 
|  | template <class Duration> | 
|  | class hh_mm_ss | 
|  | { | 
|  | bool            is_neg; // exposition only | 
|  | chrono::hours   h;      // exposition only | 
|  | chrono::minutes m;      // exposition only | 
|  | chrono::seconds s;      // exposition only | 
|  | precision       ss;     // exposition only | 
|  |  | 
|  | public: | 
|  | static unsigned constexpr fractional_width = see below; | 
|  | using precision                            = see below; | 
|  |  | 
|  | constexpr hh_mm_ss() noexcept : hh_mm_ss{Duration::zero()} {} | 
|  | constexpr explicit hh_mm_ss(Duration d) noexcept; | 
|  |  | 
|  | constexpr bool is_negative() const noexcept; | 
|  | constexpr chrono::hours hours() const noexcept; | 
|  | constexpr chrono::minutes minutes() const noexcept; | 
|  | constexpr chrono::seconds seconds() const noexcept; | 
|  | constexpr precision subseconds() const noexcept; | 
|  |  | 
|  | constexpr explicit operator  precision()   const noexcept; | 
|  | constexpr          precision to_duration() const noexcept; | 
|  | }; | 
|  |  | 
|  | template<class charT, class traits, class Duration> | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const hh_mm_ss<Duration>& hms); // C++20 | 
|  |  | 
|  | // 26.10, 12/24 hour functions | 
|  | constexpr bool is_am(hours const& h) noexcept; | 
|  | constexpr bool is_pm(hours const& h) noexcept; | 
|  | constexpr hours make12(const hours& h) noexcept; | 
|  | constexpr hours make24(const hours& h, bool is_pm) noexcept; | 
|  |  | 
|  | // [time.zone.db], time zone database | 
|  | struct tzdb {                                                                    // C++20 | 
|  | string                 version; | 
|  | vector<time_zone>      zones; | 
|  | vector<time_zone_link> links; | 
|  | vector<leap_second>    leap_seconds; | 
|  |  | 
|  | const time_zone* locate_zone(string_view tz_name) const; | 
|  | const time_zone* current_zone() const; | 
|  | }; | 
|  |  | 
|  | class tzdb_list {                                                                // C++20 | 
|  | public: | 
|  | tzdb_list(const tzdb_list&) = delete; | 
|  | tzdb_list& operator=(const tzdb_list&) = delete; | 
|  |  | 
|  | // unspecified additional constructors | 
|  |  | 
|  | class const_iterator; | 
|  |  | 
|  | const tzdb& front() const noexcept; | 
|  |  | 
|  | const_iterator erase_after(const_iterator p); | 
|  |  | 
|  | const_iterator begin() const noexcept; | 
|  | const_iterator end()   const noexcept; | 
|  |  | 
|  | const_iterator cbegin() const noexcept; | 
|  | const_iterator cend()   const noexcept; | 
|  | }; | 
|  |  | 
|  | // [time.zone.db.access], time zone database access | 
|  | const tzdb& get_tzdb();                                                          // C++20 | 
|  | tzdb_list& get_tzdb_list();                                                      // C++20 | 
|  | const time_zone* locate_zone(string_view tz_name);                               // C++20 | 
|  | const time_zone* current_zone()                                                  // C++20 | 
|  |  | 
|  | // [time.zone.db.remote], remote time zone database support | 
|  | const tzdb& reload_tzdb();                                                       // C++20 | 
|  | string remote_version();                                                         // C++20 | 
|  |  | 
|  | // [time.zone.exception], exception classes | 
|  | class nonexistent_local_time;                                                    // C++20 | 
|  | class ambiguous_local_time;                                                      // C++20 | 
|  |  | 
|  | // [time.zone.info], information classes | 
|  | struct sys_info {                                                                // C++20 | 
|  | sys_seconds   begin; | 
|  | sys_seconds   end; | 
|  | seconds       offset; | 
|  | minutes       save; | 
|  | string        abbrev; | 
|  | }; | 
|  |  | 
|  | template<class charT, class traits>                                              // C++20 | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const sys_info& si); | 
|  |  | 
|  | struct local_info {                                                             // C++20 | 
|  | static constexpr int unique      = 0; | 
|  | static constexpr int nonexistent = 1; | 
|  | static constexpr int ambiguous   = 2; | 
|  |  | 
|  | int result; | 
|  | sys_info first; | 
|  | sys_info second; | 
|  | }; | 
|  |  | 
|  | template<class charT, class traits>                                              // C++20 | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, const local_info& li); | 
|  |  | 
|  | // 25.10.5, class time_zone                                                      // C++20 | 
|  | enum class choose {earliest, latest}; | 
|  | class time_zone { | 
|  | time_zone(time_zone&&) = default; | 
|  | time_zone& operator=(time_zone&&) = default; | 
|  |  | 
|  | // unspecified additional constructors | 
|  |  | 
|  | string_view name() const noexcept; | 
|  |  | 
|  | template<class Duration> | 
|  | sys_info get_info(const sys_time<Duration>& st) const; | 
|  |  | 
|  | template<class Duration> | 
|  | local_info get_info(const local_time<Duration>& tp) const; | 
|  |  | 
|  | template<class Duration> | 
|  | sys_time<common_type_t<Duration, seconds>> | 
|  | to_sys(const local_time<Duration>& tp) const; | 
|  |  | 
|  | template<class Duration> | 
|  | sys_time<common_type_t<Duration, seconds>> | 
|  | to_sys(const local_time<Duration>& tp, choose z) const; | 
|  |  | 
|  | template<class Duration> | 
|  | local_time<common_type_t<Duration, seconds>> | 
|  | to_local(const sys_time<Duration>& tp) const; | 
|  | }; | 
|  | bool operator==(const time_zone& x, const time_zone& y) noexcept;                // C++20 | 
|  | strong_ordering operator<=>(const time_zone& x, const time_zone& y) noexcept;    // C++20 | 
|  |  | 
|  | // [time.zone.zonedtraits], class template zoned_traits | 
|  | template<class T> struct zoned_traits;                                           // C++20 | 
|  |  | 
|  | // [time.zone.zonedtime], class template zoned_time | 
|  | template<class Duration, class TimeZonePtr = const time_zone*>                   // C++20 | 
|  | class zoned_time; | 
|  |  | 
|  | using zoned_seconds = zoned_time<seconds>;                                       // C++20 | 
|  |  | 
|  | template<class Duration1, class Duration2, class TimeZonePtr>                    // C++20 | 
|  | bool operator==(const zoned_time<Duration1, TimeZonePtr>& x, | 
|  | const zoned_time<Duration2, TimeZonePtr>& y); | 
|  |  | 
|  | template<class charT, class traits, class Duration, class TimeZonePtr>           // C++20 | 
|  | basic_ostream<charT, traits>& | 
|  | operator<<(basic_ostream<charT, traits>& os, | 
|  | const zoned_time<Duration, TimeZonePtr>& t); | 
|  |  | 
|  | // [time.zone.leap], leap second support | 
|  | class leap_second {                                                              // C++20 | 
|  | public: | 
|  | leap_second(const leap_second&)            = default; | 
|  | leap_second& operator=(const leap_second&) = default; | 
|  |  | 
|  | // unspecified additional constructors | 
|  |  | 
|  | constexpr sys_seconds date() const noexcept; | 
|  | constexpr seconds value() const noexcept; | 
|  | }; | 
|  |  | 
|  | constexpr bool operator==(const leap_second& x, const leap_second& y);           // C++20 | 
|  | constexpr strong_ordering operator<=>(const leap_second& x, const leap_second& y); | 
|  |  | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator==(const leap_second& x, const sys_time<Duration>& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator< (const leap_second& x, const sys_time<Duration>& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator< (const sys_time<Duration>& x, const leap_second& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator> (const leap_second& x, const sys_time<Duration>& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator> (const sys_time<Duration>& x, const leap_second& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator<=(const leap_second& x, const sys_time<Duration>& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator<=(const sys_time<Duration>& x, const leap_second& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator>=(const leap_second& x, const sys_time<Duration>& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | constexpr bool operator>=(const sys_time<Duration>& x, const leap_second& y); | 
|  | template<class Duration>                                                         // C++20 | 
|  | requires three_way_comparable_with<sys_seconds, sys_time<Duration>> | 
|  | constexpr auto operator<=>(const leap_second& x, const sys_time<Duration>& y); | 
|  |  | 
|  | // [time.zone.link], class time_zone_link | 
|  | class time_zone_link {                                                           // C++20 | 
|  | public: | 
|  | time_zone_link(time_zone_link&&)            = default; | 
|  | time_zone_link& operator=(time_zone_link&&) = default; | 
|  |  | 
|  | // unspecified additional constructors | 
|  |  | 
|  | string_view name()   const noexcept; | 
|  | string_view target() const noexcept; | 
|  | }; | 
|  |  | 
|  | bool operator==(const time_zone_link& x, const time_zone_link& y);               // C++20 | 
|  | strong_ordering operator<=>(const time_zone_link& x, const time_zone_link& y);   // C++20 | 
|  |  | 
|  | }  // chrono | 
|  |  | 
|  | namespace std { | 
|  | template<class Duration, class charT> | 
|  | struct formatter<chrono::sys_time<Duration>, charT>;                          // C++20 | 
|  | template<class Duration, class charT> | 
|  | struct formatter<chrono::filetime<Duration>, charT>;                          // C++20 | 
|  | template<class Duration, class charT> | 
|  | struct formatter<chrono::local_time<Duration>, charT>;                        // C++20 | 
|  | template<class Rep, class Period, class charT> | 
|  | struct formatter<chrono::duration<Rep, Period>, charT>;                       // C++20 | 
|  | template<class charT> struct formatter<chrono::day, charT>;                     // C++20 | 
|  | template<class charT> struct formatter<chrono::month, charT>;                   // C++20 | 
|  | template<class charT> struct formatter<chrono::year, charT>;                    // C++20 | 
|  | template<class charT> struct formatter<chrono::weekday, charT>;                 // C++20 | 
|  | template<class charT> struct formatter<chrono::weekday_indexed, charT>;         // C++20 | 
|  | template<class charT> struct formatter<chrono::weekday_last, charT>;            // C++20 | 
|  | template<class charT> struct formatter<chrono::month_day, charT>;               // C++20 | 
|  | template<class charT> struct formatter<chrono::month_day_last, charT>;          // C++20 | 
|  | template<class charT> struct formatter<chrono::month_weekday, charT>;           // C++20 | 
|  | template<class charT> struct formatter<chrono::month_weekday_last, charT>;      // C++20 | 
|  | template<class charT> struct formatter<chrono::year_month, charT>;              // C++20 | 
|  | template<class charT> struct formatter<chrono::year_month_day, charT>;          // C++20 | 
|  | template<class charT> struct formatter<chrono::year_month_day_last, charT>;     // C++20 | 
|  | template<class charT> struct formatter<chrono::year_month_weekday, charT>;      // C++20 | 
|  | template<class charT> struct formatter<chrono::year_month_weekday_last, charT>; // C++20 | 
|  | template<class Rep, class Period, class charT> | 
|  | struct formatter<chrono::hh_mm_ss<duration<Rep, Period>>, charT>;             // C++20 | 
|  | template<class charT> struct formatter<chrono::sys_info, charT>;                // C++20 | 
|  | template<class charT> struct formatter<chrono::local_info, charT>;              // C++20 | 
|  | template<class Duration, class TimeZonePtr, class charT>                        // C++20 | 
|  | struct formatter<chrono::zoned_time<Duration, TimeZonePtr>, charT>; | 
|  | } // namespace std | 
|  |  | 
|  | namespace chrono { | 
|  | // calendrical constants | 
|  | inline constexpr last_spec                              last{};       // C++20 | 
|  | inline constexpr chrono::weekday                        Sunday{0};    // C++20 | 
|  | inline constexpr chrono::weekday                        Monday{1};    // C++20 | 
|  | inline constexpr chrono::weekday                        Tuesday{2};   // C++20 | 
|  | inline constexpr chrono::weekday                        Wednesday{3}; // C++20 | 
|  | inline constexpr chrono::weekday                        Thursday{4};  // C++20 | 
|  | inline constexpr chrono::weekday                        Friday{5};    // C++20 | 
|  | inline constexpr chrono::weekday                        Saturday{6};  // C++20 | 
|  |  | 
|  | inline constexpr chrono::month                          January{1};   // C++20 | 
|  | inline constexpr chrono::month                          February{2};  // C++20 | 
|  | inline constexpr chrono::month                          March{3};     // C++20 | 
|  | inline constexpr chrono::month                          April{4};     // C++20 | 
|  | inline constexpr chrono::month                          May{5};       // C++20 | 
|  | inline constexpr chrono::month                          June{6};      // C++20 | 
|  | inline constexpr chrono::month                          July{7};      // C++20 | 
|  | inline constexpr chrono::month                          August{8};    // C++20 | 
|  | inline constexpr chrono::month                          September{9}; // C++20 | 
|  | inline constexpr chrono::month                          October{10};  // C++20 | 
|  | inline constexpr chrono::month                          November{11}; // C++20 | 
|  | inline constexpr chrono::month                          December{12}; // C++20 | 
|  | }  // chrono | 
|  |  | 
|  | inline namespace literals { | 
|  | inline namespace chrono_literals { | 
|  | constexpr chrono::hours                                 operator ""h(unsigned long long); // C++14 | 
|  | constexpr chrono::duration<unspecified , ratio<3600,1>> operator ""h(long double); // C++14 | 
|  | constexpr chrono::minutes                               operator ""min(unsigned long long); // C++14 | 
|  | constexpr chrono::duration<unspecified , ratio<60,1>>   operator ""min(long double); // C++14 | 
|  | constexpr chrono::seconds                               operator ""s(unsigned long long); // C++14 | 
|  | constexpr chrono::duration<unspecified >                operator ""s(long double); // C++14 | 
|  | constexpr chrono::milliseconds                          operator ""ms(unsigned long long); // C++14 | 
|  | constexpr chrono::duration<unspecified , milli>         operator ""ms(long double); // C++14 | 
|  | constexpr chrono::microseconds                          operator ""us(unsigned long long); // C++14 | 
|  | constexpr chrono::duration<unspecified , micro>         operator ""us(long double); // C++14 | 
|  | constexpr chrono::nanoseconds                           operator ""ns(unsigned long long); // C++14 | 
|  | constexpr chrono::duration<unspecified , nano>          operator ""ns(long double); // C++14 | 
|  | constexpr chrono::day                                   operator ""d(unsigned long long d) noexcept; // C++20 | 
|  | constexpr chrono::year                                  operator ""y(unsigned long long y) noexcept; // C++20 | 
|  | }  // chrono_literals | 
|  | }  // literals | 
|  |  | 
|  | }  // std | 
|  | */ | 
|  |  | 
|  | // clang-format on | 
|  |  | 
|  | #include <__cxx03/__config> | 
|  |  | 
|  | #include <__cxx03/__chrono/duration.h> | 
|  | #include <__cxx03/__chrono/file_clock.h> | 
|  | #include <__cxx03/__chrono/high_resolution_clock.h> | 
|  | #include <__cxx03/__chrono/steady_clock.h> | 
|  | #include <__cxx03/__chrono/system_clock.h> | 
|  | #include <__cxx03/__chrono/time_point.h> | 
|  |  | 
|  | #if _LIBCPP_STD_VER >= 20 | 
|  | #  include <__cxx03/__chrono/calendar.h> | 
|  | #  include <__cxx03/__chrono/day.h> | 
|  | #  include <__cxx03/__chrono/exception.h> | 
|  | #  include <__cxx03/__chrono/hh_mm_ss.h> | 
|  | #  include <__cxx03/__chrono/literals.h> | 
|  | #  include <__cxx03/__chrono/local_info.h> | 
|  | #  include <__cxx03/__chrono/month.h> | 
|  | #  include <__cxx03/__chrono/month_weekday.h> | 
|  | #  include <__cxx03/__chrono/monthday.h> | 
|  | #  include <__cxx03/__chrono/sys_info.h> | 
|  | #  include <__cxx03/__chrono/weekday.h> | 
|  | #  include <__cxx03/__chrono/year.h> | 
|  | #  include <__cxx03/__chrono/year_month.h> | 
|  | #  include <__cxx03/__chrono/year_month_day.h> | 
|  | #  include <__cxx03/__chrono/year_month_weekday.h> | 
|  |  | 
|  | #  if !defined(_LIBCPP_HAS_NO_LOCALIZATION) | 
|  | #    include <__cxx03/__chrono/formatter.h> | 
|  | #    include <__cxx03/__chrono/ostream.h> | 
|  | #    include <__cxx03/__chrono/parser_std_format_spec.h> | 
|  | #    include <__cxx03/__chrono/statically_widen.h> | 
|  | #  endif | 
|  |  | 
|  | #  if !defined(_LIBCPP_HAS_NO_TIME_ZONE_DATABASE) && !defined(_LIBCPP_HAS_NO_FILESYSTEM) &&                            \ | 
|  | !defined(_LIBCPP_HAS_NO_LOCALIZATION) | 
|  | #    include <__cxx03/__chrono/leap_second.h> | 
|  | #    include <__cxx03/__chrono/time_zone.h> | 
|  | #    include <__cxx03/__chrono/time_zone_link.h> | 
|  | #    include <__cxx03/__chrono/tzdb.h> | 
|  | #    include <__cxx03/__chrono/tzdb_list.h> | 
|  | #    include <__cxx03/__chrono/zoned_time.h> | 
|  | #  endif | 
|  |  | 
|  | #endif | 
|  |  | 
|  | #include <__cxx03/version> | 
|  |  | 
|  | // standard-mandated includes | 
|  |  | 
|  | // [time.syn] | 
|  | #include <__cxx03/compare> | 
|  |  | 
|  | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) | 
|  | #  pragma GCC system_header | 
|  | #endif | 
|  |  | 
|  | #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17 | 
|  | #  include <__cxx03/cstdint> | 
|  | #  include <__cxx03/stdexcept> | 
|  | #  include <__cxx03/string_view> | 
|  | #  include <__cxx03/vector> | 
|  | #endif | 
|  |  | 
|  | #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 | 
|  | #  include <__cxx03/bit> | 
|  | #  include <__cxx03/concepts> | 
|  | #  include <__cxx03/cstring> | 
|  | #  include <__cxx03/forward_list> | 
|  | #  include <__cxx03/string> | 
|  | #  include <__cxx03/tuple> | 
|  | #endif | 
|  |  | 
|  | #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER == 20 | 
|  | #  include <__cxx03/charconv> | 
|  | #  if !defined(_LIBCPP_HAS_NO_LOCALIZATION) | 
|  | #    include <__cxx03/locale> | 
|  | #    include <__cxx03/ostream> | 
|  | #  endif | 
|  | #endif | 
|  |  | 
|  | #endif // _LIBCPP___CXX03_CHRONO |