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// <chrono> -*- C++ -*- // Copyright (C) 2008-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file include/chrono * This is a Standard C++ Library header. */ #ifndef _GLIBCXX_CHRONO #define _GLIBCXX_CHRONO 1 #pragma GCC system_header #if __cplusplus < 201103L # include <bits/c++0x_warning.h> #else #include <ratio> #include <type_traits> #include <limits> #include <ctime> #include <bits/parse_numbers.h> // for literals support. #ifdef _GLIBCXX_USE_C99_STDINT_TR1 namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @defgroup chrono Time * @ingroup utilities * * Classes and functions for time. * @{ */ /** @namespace std::chrono * @brief ISO C++ 2011 entities sub-namespace for time and date. */ namespace chrono { template<typename _Rep, typename _Period = ratio<1>> struct duration; template<typename _Clock, typename _Dur = typename _Clock::duration> struct time_point; } // 20.11.4.3 specialization of common_type (for duration, sfinae-friendly) template<typename _CT, typename _Period1, typename _Period2> struct __duration_common_type_wrapper { private: typedef __static_gcd<_Period1::num, _Period2::num> __gcd_num; typedef __static_gcd<_Period1::den, _Period2::den> __gcd_den; typedef typename _CT::type __cr; typedef ratio<__gcd_num::value, (_Period1::den / __gcd_den::value) * _Period2::den> __r; public: typedef __success_type<chrono::duration<__cr, __r>> type; }; template<typename _Period1, typename _Period2> struct __duration_common_type_wrapper<__failure_type, _Period1, _Period2> { typedef __failure_type type; }; template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> struct common_type<chrono::duration<_Rep1, _Period1>, chrono::duration<_Rep2, _Period2>> : public __duration_common_type_wrapper<typename __member_type_wrapper< common_type<_Rep1, _Rep2>>::type, _Period1, _Period2>::type { }; // 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly) template<typename _CT, typename _Clock> struct __timepoint_common_type_wrapper { typedef __success_type<chrono::time_point<_Clock, typename _CT::type>> type; }; template<typename _Clock> struct __timepoint_common_type_wrapper<__failure_type, _Clock> { typedef __failure_type type; }; template<typename _Clock, typename _Duration1, typename _Duration2> struct common_type<chrono::time_point<_Clock, _Duration1>, chrono::time_point<_Clock, _Duration2>> : public __timepoint_common_type_wrapper<typename __member_type_wrapper< common_type<_Duration1, _Duration2>>::type, _Clock>::type { }; namespace chrono { // Primary template for duration_cast impl. template<typename _ToDur, typename _CF, typename _CR, bool _NumIsOne = false, bool _DenIsOne = false> struct __duration_cast_impl { template<typename _Rep, typename _Period> static constexpr _ToDur __cast(const duration<_Rep, _Period>& __d) { typedef typename _ToDur::rep __to_rep; return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num) / static_cast<_CR>(_CF::den))); } }; template<typename _ToDur, typename _CF, typename _CR> struct __duration_cast_impl<_ToDur, _CF, _CR, true, true> { template<typename _Rep, typename _Period> static constexpr _ToDur __cast(const duration<_Rep, _Period>& __d) { typedef typename _ToDur::rep __to_rep; return _ToDur(static_cast<__to_rep>(__d.count())); } }; template<typename _ToDur, typename _CF, typename _CR> struct __duration_cast_impl<_ToDur, _CF, _CR, true, false> { template<typename _Rep, typename _Period> static constexpr _ToDur __cast(const duration<_Rep, _Period>& __d) { typedef typename _ToDur::rep __to_rep; return _ToDur(static_cast<__to_rep>( static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den))); } }; template<typename _ToDur, typename _CF, typename _CR> struct __duration_cast_impl<_ToDur, _CF, _CR, false, true> { template<typename _Rep, typename _Period> static constexpr _ToDur __cast(const duration<_Rep, _Period>& __d) { typedef typename _ToDur::rep __to_rep; return _ToDur(static_cast<__to_rep>( static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num))); } }; template<typename _Tp> struct __is_duration : std::false_type { }; template<typename _Rep, typename _Period> struct __is_duration<duration<_Rep, _Period>> : std::true_type { }; template<typename _Tp> using __enable_if_is_duration = typename enable_if<__is_duration<_Tp>::value, _Tp>::type; template<typename _Tp> using __disable_if_is_duration = typename enable_if<!__is_duration<_Tp>::value, _Tp>::type; /// duration_cast template<typename _ToDur, typename _Rep, typename _Period> constexpr __enable_if_is_duration<_ToDur> duration_cast(const duration<_Rep, _Period>& __d) { typedef typename _ToDur::period __to_period; typedef typename _ToDur::rep __to_rep; typedef ratio_divide<_Period, __to_period> __cf; typedef typename common_type<__to_rep, _Rep, intmax_t>::type __cr; typedef __duration_cast_impl<_ToDur, __cf, __cr, __cf::num == 1, __cf::den == 1> __dc; return __dc::__cast(__d); } /// treat_as_floating_point template<typename _Rep> struct treat_as_floating_point : is_floating_point<_Rep> { }; #if __cplusplus > 201402L template <typename _Rep> inline constexpr bool treat_as_floating_point_v = treat_as_floating_point<_Rep>::value; #endif // C++17 #if __cplusplus >= 201703L # define __cpp_lib_chrono 201611 template<typename _ToDur, typename _Rep, typename _Period> constexpr __enable_if_is_duration<_ToDur> floor(const duration<_Rep, _Period>& __d) { auto __to = chrono::duration_cast<_ToDur>(__d); if (__to > __d) return __to - _ToDur{1}; return __to; } template<typename _ToDur, typename _Rep, typename _Period> constexpr __enable_if_is_duration<_ToDur> ceil(const duration<_Rep, _Period>& __d) { auto __to = chrono::duration_cast<_ToDur>(__d); if (__to < __d) return __to + _ToDur{1}; return __to; } template <typename _ToDur, typename _Rep, typename _Period> constexpr enable_if_t< __and_<__is_duration<_ToDur>, __not_<treat_as_floating_point<typename _ToDur::rep>>>::value, _ToDur> round(const duration<_Rep, _Period>& __d) { _ToDur __t0 = chrono::floor<_ToDur>(__d); _ToDur __t1 = __t0 + _ToDur{1}; auto __diff0 = __d - __t0; auto __diff1 = __t1 - __d; if (__diff0 == __diff1) { if (__t0.count() & 1) return __t1; return __t0; } else if (__diff0 < __diff1) return __t0; return __t1; } template<typename _Rep, typename _Period> constexpr enable_if_t<numeric_limits<_Rep>::is_signed, duration<_Rep, _Period>> abs(duration<_Rep, _Period> __d) { if (__d >= __d.zero()) return __d; return -__d; } #endif // C++17 /// duration_values template<typename _Rep> struct duration_values { static constexpr _Rep zero() noexcept { return _Rep(0); } static constexpr _Rep max() noexcept { return numeric_limits<_Rep>::max(); } static constexpr _Rep min() noexcept { return numeric_limits<_Rep>::lowest(); } }; template<typename _Tp> struct __is_ratio : std::false_type { }; template<intmax_t _Num, intmax_t _Den> struct __is_ratio<ratio<_Num, _Den>> : std::true_type { }; /// duration template<typename _Rep, typename _Period> struct duration { private: template<typename _Rep2> using __is_float = treat_as_floating_point<_Rep2>; // _Period2 is an exact multiple of _Period template<typename _Period2> using __is_harmonic = __bool_constant<ratio_divide<_Period2, _Period>::den == 1>; public: typedef _Rep rep; typedef _Period period; static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration"); static_assert(__is_ratio<_Period>::value, "period must be a specialization of ratio"); static_assert(_Period::num > 0, "period must be positive"); // 20.11.5.1 construction / copy / destroy constexpr duration() = default; duration(const duration&) = default; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3050. Conversion specification problem in chrono::duration template<typename _Rep2, typename = _Require< is_convertible<const _Rep2&, rep>, __or_<__is_float<rep>, __not_<__is_float<_Rep2>>>>> constexpr explicit duration(const _Rep2& __rep) : __r(static_cast<rep>(__rep)) { } template<typename _Rep2, typename _Period2, typename = _Require< __or_<__is_float<rep>, __and_<__is_harmonic<_Period2>, __not_<__is_float<_Rep2>>>>>> constexpr duration(const duration<_Rep2, _Period2>& __d) : __r(duration_cast<duration>(__d).count()) { } ~duration() = default; duration& operator=(const duration&) = default; // 20.11.5.2 observer constexpr rep count() const { return __r; } // 20.11.5.3 arithmetic constexpr duration operator+() const { return *this; } constexpr duration operator-() const { return duration(-__r); } _GLIBCXX17_CONSTEXPR duration& operator++() { ++__r; return *this; } _GLIBCXX17_CONSTEXPR duration operator++(int) { return duration(__r++); } _GLIBCXX17_CONSTEXPR duration& operator--() { --__r; return *this; } _GLIBCXX17_CONSTEXPR duration operator--(int) { return duration(__r--); } _GLIBCXX17_CONSTEXPR duration& operator+=(const duration& __d) { __r += __d.count(); return *this; } _GLIBCXX17_CONSTEXPR duration& operator-=(const duration& __d) { __r -= __d.count(); return *this; } _GLIBCXX17_CONSTEXPR duration& operator*=(const rep& __rhs) { __r *= __rhs; return *this; } _GLIBCXX17_CONSTEXPR duration& operator/=(const rep& __rhs) { __r /= __rhs; return *this; } // DR 934. template<typename _Rep2 = rep> _GLIBCXX17_CONSTEXPR typename enable_if<!treat_as_floating_point<_Rep2>::value, duration&>::type operator%=(const rep& __rhs) { __r %= __rhs; return *this; } template<typename _Rep2 = rep> _GLIBCXX17_CONSTEXPR typename enable_if<!treat_as_floating_point<_Rep2>::value, duration&>::type operator%=(const duration& __d) { __r %= __d.count(); return *this; } // 20.11.5.4 special values static constexpr duration zero() noexcept { return duration(duration_values<rep>::zero()); } static constexpr duration min() noexcept { return duration(duration_values<rep>::min()); } static constexpr duration max() noexcept { return duration(duration_values<rep>::max()); } private: rep __r; }; template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>::type operator+(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef duration<_Rep1, _Period1> __dur1; typedef duration<_Rep2, _Period2> __dur2; typedef typename common_type<__dur1,__dur2>::type __cd; return __cd(__cd(__lhs).count() + __cd(__rhs).count()); } template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>::type operator-(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef duration<_Rep1, _Period1> __dur1; typedef duration<_Rep2, _Period2> __dur2; typedef typename common_type<__dur1,__dur2>::type __cd; return __cd(__cd(__lhs).count() - __cd(__rhs).count()); } // SFINAE helper to obtain common_type<_Rep1, _Rep2> only if _Rep2 // is implicitly convertible to it. // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3050. Conversion specification problem in chrono::duration constructor template<typename _Rep1, typename _Rep2, typename _CRep = typename common_type<_Rep1, _Rep2>::type> using __common_rep_t = typename enable_if<is_convertible<const _Rep2&, _CRep>::value, _CRep>::type; template<typename _Rep1, typename _Period, typename _Rep2> constexpr duration<__common_rep_t<_Rep1, _Rep2>, _Period> operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s) { typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period> __cd; return __cd(__cd(__d).count() * __s); } template<typename _Rep1, typename _Rep2, typename _Period> constexpr duration<__common_rep_t<_Rep2, _Rep1>, _Period> operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d) { return __d * __s; } template<typename _Rep1, typename _Period, typename _Rep2> constexpr duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period> operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s) { typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period> __cd; return __cd(__cd(__d).count() / __s); } template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr typename common_type<_Rep1, _Rep2>::type operator/(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef duration<_Rep1, _Period1> __dur1; typedef duration<_Rep2, _Period2> __dur2; typedef typename common_type<__dur1,__dur2>::type __cd; return __cd(__lhs).count() / __cd(__rhs).count(); } // DR 934. template<typename _Rep1, typename _Period, typename _Rep2> constexpr duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period> operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s) { typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period> __cd; return __cd(__cd(__d).count() % __s); } template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>::type operator%(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef duration<_Rep1, _Period1> __dur1; typedef duration<_Rep2, _Period2> __dur2; typedef typename common_type<__dur1,__dur2>::type __cd; return __cd(__cd(__lhs).count() % __cd(__rhs).count()); } // comparisons template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr bool operator==(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef duration<_Rep1, _Period1> __dur1; typedef duration<_Rep2, _Period2> __dur2; typedef typename common_type<__dur1,__dur2>::type __ct; return __ct(__lhs).count() == __ct(__rhs).count(); } template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr bool operator<(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef duration<_Rep1, _Period1> __dur1; typedef duration<_Rep2, _Period2> __dur2; typedef typename common_type<__dur1,__dur2>::type __ct; return __ct(__lhs).count() < __ct(__rhs).count(); } template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr bool operator!=(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return !(__lhs == __rhs); } template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr bool operator<=(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return !(__rhs < __lhs); } template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr bool operator>(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return __rhs < __lhs; } template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> constexpr bool operator>=(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return !(__lhs < __rhs); } /// nanoseconds typedef duration<int64_t, nano> nanoseconds; /// microseconds typedef duration<int64_t, micro> microseconds; /// milliseconds typedef duration<int64_t, milli> milliseconds; /// seconds typedef duration<int64_t> seconds; /// minutes typedef duration<int64_t, ratio< 60>> minutes; /// hours typedef duration<int64_t, ratio<3600>> hours; /// time_point template<typename _Clock, typename _Dur> struct time_point { typedef _Clock clock; typedef _Dur duration; typedef typename duration::rep rep; typedef typename duration::period period; constexpr time_point() : __d(duration::zero()) { } constexpr explicit time_point(const duration& __dur) : __d(__dur) { } // conversions template<typename _Dur2, typename = _Require<is_convertible<_Dur2, _Dur>>> constexpr time_point(const time_point<clock, _Dur2>& __t) : __d(__t.time_since_epoch()) { } // observer constexpr duration time_since_epoch() const { return __d; } // arithmetic _GLIBCXX17_CONSTEXPR time_point& operator+=(const duration& __dur) { __d += __dur; return *this; } _GLIBCXX17_CONSTEXPR time_point& operator-=(const duration& __dur) { __d -= __dur; return *this; } // special values static constexpr time_point min() noexcept { return time_point(duration::min()); } static constexpr time_point max() noexcept { return time_point(duration::max()); } private: duration __d; }; /// time_point_cast template<typename _ToDur, typename _Clock, typename _Dur> constexpr typename enable_if<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>::type time_point_cast(const time_point<_Clock, _Dur>& __t) { typedef time_point<_Clock, _ToDur> __time_point; return __time_point(duration_cast<_ToDur>(__t.time_since_epoch())); } #if __cplusplus > 201402L template<typename _ToDur, typename _Clock, typename _Dur> constexpr enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>> floor(const time_point<_Clock, _Dur>& __tp) { return time_point<_Clock, _ToDur>{ chrono::floor<_ToDur>(__tp.time_since_epoch())}; } template<typename _ToDur, typename _Clock, typename _Dur> constexpr enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>> ceil(const time_point<_Clock, _Dur>& __tp) { return time_point<_Clock, _ToDur>{ chrono::ceil<_ToDur>(__tp.time_since_epoch())}; } template<typename _ToDur, typename _Clock, typename _Dur> constexpr enable_if_t< __and_<__is_duration<_ToDur>, __not_<treat_as_floating_point<typename _ToDur::rep>>>::value, time_point<_Clock, _ToDur>> round(const time_point<_Clock, _Dur>& __tp) { return time_point<_Clock, _ToDur>{ chrono::round<_ToDur>(__tp.time_since_epoch())}; } #endif // C++17 template<typename _Clock, typename _Dur1, typename _Rep2, typename _Period2> constexpr time_point<_Clock, typename common_type<_Dur1, duration<_Rep2, _Period2>>::type> operator+(const time_point<_Clock, _Dur1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef duration<_Rep2, _Period2> __dur2; typedef typename common_type<_Dur1,__dur2>::type __ct; typedef time_point<_Clock, __ct> __time_point; return __time_point(__lhs.time_since_epoch() + __rhs); } template<typename _Rep1, typename _Period1, typename _Clock, typename _Dur2> constexpr time_point<_Clock, typename common_type<duration<_Rep1, _Period1>, _Dur2>::type> operator+(const duration<_Rep1, _Period1>& __lhs, const time_point<_Clock, _Dur2>& __rhs) { typedef duration<_Rep1, _Period1> __dur1; typedef typename common_type<__dur1,_Dur2>::type __ct; typedef time_point<_Clock, __ct> __time_point; return __time_point(__rhs.time_since_epoch() + __lhs); } template<typename _Clock, typename _Dur1, typename _Rep2, typename _Period2> constexpr time_point<_Clock, typename common_type<_Dur1, duration<_Rep2, _Period2>>::type> operator-(const time_point<_Clock, _Dur1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef duration<_Rep2, _Period2> __dur2; typedef typename common_type<_Dur1,__dur2>::type __ct; typedef time_point<_Clock, __ct> __time_point; return __time_point(__lhs.time_since_epoch() -__rhs); } template<typename _Clock, typename _Dur1, typename _Dur2> constexpr typename common_type<_Dur1, _Dur2>::type operator-(const time_point<_Clock, _Dur1>& __lhs, const time_point<_Clock, _Dur2>& __rhs) { return __lhs.time_since_epoch() - __rhs.time_since_epoch(); } template<typename _Clock, typename _Dur1, typename _Dur2> constexpr bool operator==(const time_point<_Clock, _Dur1>& __lhs, const time_point<_Clock, _Dur2>& __rhs) { return __lhs.time_since_epoch() == __rhs.time_since_epoch(); } template<typename _Clock, typename _Dur1, typename _Dur2> constexpr bool operator!=(const time_point<_Clock, _Dur1>& __lhs, const time_point<_Clock, _Dur2>& __rhs) { return !(__lhs == __rhs); } template<typename _Clock, typename _Dur1, typename _Dur2> constexpr bool operator<(const time_point<_Clock, _Dur1>& __lhs, const time_point<_Clock, _Dur2>& __rhs) { return __lhs.time_since_epoch() < __rhs.time_since_epoch(); } template<typename _Clock, typename _Dur1, typename _Dur2> constexpr bool operator<=(const time_point<_Clock, _Dur1>& __lhs, const time_point<_Clock, _Dur2>& __rhs) { return !(__rhs < __lhs); } template<typename _Clock, typename _Dur1, typename _Dur2> constexpr bool operator>(const time_point<_Clock, _Dur1>& __lhs, const time_point<_Clock, _Dur2>& __rhs) { return __rhs < __lhs; } template<typename _Clock, typename _Dur1, typename _Dur2> constexpr bool operator>=(const time_point<_Clock, _Dur1>& __lhs, const time_point<_Clock, _Dur2>& __rhs) { return !(__lhs < __rhs); } // Clocks. // Why nanosecond resolution as the default? // Why have std::system_clock always count in the highest // resolution (ie nanoseconds), even if on some OSes the low 3 // or 9 decimal digits will be always zero? This allows later // implementations to change the system_clock::now() // implementation any time to provide better resolution without // changing function signature or units. // To support the (forward) evolution of the library's defined // clocks, wrap inside inline namespace so that the current // defintions of system_clock, steady_clock, and // high_resolution_clock types are uniquely mangled. This way, new // code can use the latests clocks, while the library can contain // compatibility definitions for previous versions. At some // point, when these clocks settle down, the inlined namespaces // can be removed. XXX GLIBCXX_ABI Deprecated inline namespace _V2 { /** * @brief System clock. * * Time returned represents wall time from the system-wide clock. */ struct system_clock { typedef chrono::nanoseconds duration; typedef duration::rep rep; typedef duration::period period; typedef chrono::time_point<system_clock, duration> time_point; static_assert(system_clock::duration::min() < system_clock::duration::zero(), "a clock's minimum duration cannot be less than its epoch"); static constexpr bool is_steady = false; static time_point now() noexcept; // Map to C API static std::time_t to_time_t(const time_point& __t) noexcept { return std::time_t(duration_cast<chrono::seconds> (__t.time_since_epoch()).count()); } static time_point from_time_t(std::time_t __t) noexcept { typedef chrono::time_point<system_clock, seconds> __from; return time_point_cast<system_clock::duration> (__from(chrono::seconds(__t))); } }; /** * @brief Monotonic clock * * Time returned has the property of only increasing at a uniform rate. */ struct steady_clock { typedef chrono::nanoseconds duration; typedef duration::rep rep; typedef duration::period period; typedef chrono::time_point<steady_clock, duration> time_point; static constexpr bool is_steady = true; static time_point now() noexcept; }; /** * @brief Highest-resolution clock * * This is the clock "with the shortest tick period." Alias to * std::system_clock until higher-than-nanosecond definitions * become feasible. */ using high_resolution_clock = system_clock; } // end inline namespace _V2 } // namespace chrono #if __cplusplus > 201103L #define __cpp_lib_chrono_udls 201304 inline namespace literals { inline namespace chrono_literals { #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wliteral-suffix" template<typename _Rep, unsigned long long _Val> struct _Checked_integral_constant : integral_constant<_Rep, static_cast<_Rep>(_Val)> { static_assert(_Checked_integral_constant::value >= 0 && _Checked_integral_constant::value == _Val, "literal value cannot be represented by duration type"); }; template<typename _Dur, char... _Digits> constexpr _Dur __check_overflow() { using _Val = __parse_int::_Parse_int<_Digits...>; using _Rep = typename _Dur::rep; // TODO: should be simply integral_constant<_Rep, _Val::value> // but GCC doesn't reject narrowing conversions to _Rep. using _CheckedVal = _Checked_integral_constant<_Rep, _Val::value>; return _Dur{_CheckedVal::value}; } constexpr chrono::duration<long double, ratio<3600,1>> operator""h(long double __hours) { return chrono::duration<long double, ratio<3600,1>>{__hours}; } template <char... _Digits> constexpr chrono::hours operator""h() { return __check_overflow<chrono::hours, _Digits...>(); } constexpr chrono::duration<long double, ratio<60,1>> operator""min(long double __mins) { return chrono::duration<long double, ratio<60,1>>{__mins}; } template <char... _Digits> constexpr chrono::minutes operator""min() { return __check_overflow<chrono::minutes, _Digits...>(); } constexpr chrono::duration<long double> operator""s(long double __secs) { return chrono::duration<long double>{__secs}; } template <char... _Digits> constexpr chrono::seconds operator""s() { return __check_overflow<chrono::seconds, _Digits...>(); } constexpr chrono::duration<long double, milli> operator""ms(long double __msecs) { return chrono::duration<long double, milli>{__msecs}; } template <char... _Digits> constexpr chrono::milliseconds operator""ms() { return __check_overflow<chrono::milliseconds, _Digits...>(); } constexpr chrono::duration<long double, micro> operator""us(long double __usecs) { return chrono::duration<long double, micro>{__usecs}; } template <char... _Digits> constexpr chrono::microseconds operator""us() { return __check_overflow<chrono::microseconds, _Digits...>(); } constexpr chrono::duration<long double, nano> operator""ns(long double __nsecs) { return chrono::duration<long double, nano>{__nsecs}; } template <char... _Digits> constexpr chrono::nanoseconds operator""ns() { return __check_overflow<chrono::nanoseconds, _Digits...>(); } #pragma GCC diagnostic pop } // inline namespace chrono_literals } // inline namespace literals namespace chrono { using namespace literals::chrono_literals; } // namespace chrono #endif // C++14 // @} group chrono _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif //_GLIBCXX_USE_C99_STDINT_TR1 #endif // C++11 #endif //_GLIBCXX_CHRONO
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