// -*- 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___CHRONO_DURATION_H #define _LIBCPP___CHRONO_DURATION_H #include <__compare/ordering.h> #include <__compare/three_way_comparable.h> #include <__config> #include <__type_traits/common_type.h> #include <__type_traits/enable_if.h> #include <__type_traits/is_convertible.h> #include <__type_traits/is_floating_point.h> #include <limits> #include <ratio> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) # pragma GCC system_header #endif _LIBCPP_PUSH_MACROS #include <__undef_macros> _LIBCPP_BEGIN_NAMESPACE_STD namespace chrono { template <class _Rep, class _Period = ratio<1> > class _LIBCPP_TEMPLATE_VIS duration; template <class _Tp> struct __is_duration : false_type {}; template <class _Rep, class _Period> struct __is_duration<duration<_Rep, _Period> > : true_type {}; template <class _Rep, class _Period> struct __is_duration<const duration<_Rep, _Period> > : true_type {}; template <class _Rep, class _Period> struct __is_duration<volatile duration<_Rep, _Period> > : true_type {}; template <class _Rep, class _Period> struct __is_duration<const volatile duration<_Rep, _Period> > : true_type {}; } // namespace chrono template <class _Rep1, class _Period1, class _Rep2, class _Period2> struct _LIBCPP_TEMPLATE_VIS common_type<chrono::duration<_Rep1, _Period1>, chrono::duration<_Rep2, _Period2> > { typedef chrono::duration<typename common_type<_Rep1, _Rep2>::type, typename __ratio_gcd<_Period1, _Period2>::type> type; }; namespace chrono { // duration_cast template <class _FromDuration, class _ToDuration, class _Period = typename ratio_divide<typename _FromDuration::period, typename _ToDuration::period>::type, bool = _Period::num == 1, bool = _Period::den == 1> struct __duration_cast; template <class _FromDuration, class _ToDuration, class _Period> struct __duration_cast<_FromDuration, _ToDuration, _Period, true, true> { _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration operator()(const _FromDuration& __fd) const { return _ToDuration(static_cast<typename _ToDuration::rep>(__fd.count())); } }; template <class _FromDuration, class _ToDuration, class _Period> struct __duration_cast<_FromDuration, _ToDuration, _Period, true, false> { _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration operator()(const _FromDuration& __fd) const { typedef typename common_type<typename _ToDuration::rep, typename _FromDuration::rep, intmax_t>::type _Ct; return _ToDuration( static_cast<typename _ToDuration::rep>(static_cast<_Ct>(__fd.count()) / static_cast<_Ct>(_Period::den))); } }; template <class _FromDuration, class _ToDuration, class _Period> struct __duration_cast<_FromDuration, _ToDuration, _Period, false, true> { _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration operator()(const _FromDuration& __fd) const { typedef typename common_type<typename _ToDuration::rep, typename _FromDuration::rep, intmax_t>::type _Ct; return _ToDuration( static_cast<typename _ToDuration::rep>(static_cast<_Ct>(__fd.count()) * static_cast<_Ct>(_Period::num))); } }; template <class _FromDuration, class _ToDuration, class _Period> struct __duration_cast<_FromDuration, _ToDuration, _Period, false, false> { _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration operator()(const _FromDuration& __fd) const { typedef typename common_type<typename _ToDuration::rep, typename _FromDuration::rep, intmax_t>::type _Ct; return _ToDuration(static_cast<typename _ToDuration::rep>( static_cast<_Ct>(__fd.count()) * static_cast<_Ct>(_Period::num) / static_cast<_Ct>(_Period::den))); } }; template <class _ToDuration, class _Rep, class _Period, __enable_if_t<__is_duration<_ToDuration>::value, int> = 0> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration duration_cast(const duration<_Rep, _Period>& __fd) { return __duration_cast<duration<_Rep, _Period>, _ToDuration>()(__fd); } template <class _Rep> struct _LIBCPP_TEMPLATE_VIS treat_as_floating_point : is_floating_point<_Rep> {}; #if _LIBCPP_STD_VER >= 17 template <class _Rep> inline constexpr bool treat_as_floating_point_v = treat_as_floating_point<_Rep>::value; #endif template <class _Rep> struct _LIBCPP_TEMPLATE_VIS duration_values { public: _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR _Rep zero() _NOEXCEPT { return _Rep(0); } _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR _Rep max() _NOEXCEPT { return numeric_limits<_Rep>::max(); } _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR _Rep min() _NOEXCEPT { return numeric_limits<_Rep>::lowest(); } }; #if _LIBCPP_STD_VER >= 17 template <class _ToDuration, class _Rep, class _Period, enable_if_t<__is_duration<_ToDuration>::value, int> = 0> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration floor(const duration<_Rep, _Period>& __d) { _ToDuration __t = chrono::duration_cast<_ToDuration>(__d); if (__t > __d) __t = __t - _ToDuration{1}; return __t; } template <class _ToDuration, class _Rep, class _Period, enable_if_t<__is_duration<_ToDuration>::value, int> = 0> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration ceil(const duration<_Rep, _Period>& __d) { _ToDuration __t = chrono::duration_cast<_ToDuration>(__d); if (__t < __d) __t = __t + _ToDuration{1}; return __t; } template <class _ToDuration, class _Rep, class _Period, enable_if_t<__is_duration<_ToDuration>::value, int> = 0> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration round(const duration<_Rep, _Period>& __d) { _ToDuration __lower = chrono::floor<_ToDuration>(__d); _ToDuration __upper = __lower + _ToDuration{1}; auto __lower_diff = __d - __lower; auto __upper_diff = __upper - __d; if (__lower_diff < __upper_diff) return __lower; if (__lower_diff > __upper_diff) return __upper; return __lower.count() & 1 ? __upper : __lower; } #endif // duration template <class _Rep, class _Period> class _LIBCPP_TEMPLATE_VIS 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"); template <class _R1, class _R2> struct __no_overflow { private: static const intmax_t __gcd_n1_n2 = __static_gcd<_R1::num, _R2::num>::value; static const intmax_t __gcd_d1_d2 = __static_gcd<_R1::den, _R2::den>::value; static const intmax_t __n1 = _R1::num / __gcd_n1_n2; static const intmax_t __d1 = _R1::den / __gcd_d1_d2; static const intmax_t __n2 = _R2::num / __gcd_n1_n2; static const intmax_t __d2 = _R2::den / __gcd_d1_d2; static const intmax_t max = -((intmax_t(1) << (sizeof(intmax_t) * CHAR_BIT - 1)) + 1); template <intmax_t _Xp, intmax_t _Yp, bool __overflow> struct __mul // __overflow == false { static const intmax_t value = _Xp * _Yp; }; template <intmax_t _Xp, intmax_t _Yp> struct __mul<_Xp, _Yp, true> { static const intmax_t value = 1; }; public: static const bool value = (__n1 <= max / __d2) && (__n2 <= max / __d1); typedef ratio<__mul<__n1, __d2, !value>::value, __mul<__n2, __d1, !value>::value> type; }; public: typedef _Rep rep; typedef typename _Period::type period; private: rep __rep_; public: #ifndef _LIBCPP_CXX03_LANG constexpr duration() = default; #else _LIBCPP_HIDE_FROM_ABI duration() {} #endif template <class _Rep2, __enable_if_t<is_convertible<const _Rep2&, rep>::value && (treat_as_floating_point<rep>::value || !treat_as_floating_point<_Rep2>::value), int> = 0> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit duration(const _Rep2& __r) : __rep_(__r) {} // conversions template <class _Rep2, class _Period2, __enable_if_t<__no_overflow<_Period2, period>::value && (treat_as_floating_point<rep>::value || (__no_overflow<_Period2, period>::type::den == 1 && !treat_as_floating_point<_Rep2>::value)), int> = 0> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR duration(const duration<_Rep2, _Period2>& __d) : __rep_(chrono::duration_cast<duration>(__d).count()) {} // observer _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR rep count() const { return __rep_; } // arithmetic _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR typename common_type<duration>::type operator+() const { return typename common_type<duration>::type(*this); } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR typename common_type<duration>::type operator-() const { return typename common_type<duration>::type(-__rep_); } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration& operator++() { ++__rep_; return *this; } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration operator++(int) { return duration(__rep_++); } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration& operator--() { --__rep_; return *this; } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration operator--(int) { return duration(__rep_--); } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration& operator+=(const duration& __d) { __rep_ += __d.count(); return *this; } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration& operator-=(const duration& __d) { __rep_ -= __d.count(); return *this; } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration& operator*=(const rep& __rhs) { __rep_ *= __rhs; return *this; } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration& operator/=(const rep& __rhs) { __rep_ /= __rhs; return *this; } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration& operator%=(const rep& __rhs) { __rep_ %= __rhs; return *this; } _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 duration& operator%=(const duration& __rhs) { __rep_ %= __rhs.count(); return *this; } // special values _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR duration zero() _NOEXCEPT { return duration(duration_values<rep>::zero()); } _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR duration min() _NOEXCEPT { return duration(duration_values<rep>::min()); } _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR duration max() _NOEXCEPT { return duration(duration_values<rep>::max()); } }; 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; #if _LIBCPP_STD_VER >= 20 typedef duration< int, ratio_multiply<ratio<24>, hours::period>> days; typedef duration< int, ratio_multiply<ratio<7>, days::period>> weeks; typedef duration< int, ratio_multiply<ratio<146097, 400>, days::period>> years; typedef duration< int, ratio_divide<years::period, ratio<12>>> months; #endif // Duration == template <class _LhsDuration, class _RhsDuration> struct __duration_eq { _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs) const { typedef typename common_type<_LhsDuration, _RhsDuration>::type _Ct; return _Ct(__lhs).count() == _Ct(__rhs).count(); } }; template <class _LhsDuration> struct __duration_eq<_LhsDuration, _LhsDuration> { _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs) const { return __lhs.count() == __rhs.count(); } }; template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator==(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return __duration_eq<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >()(__lhs, __rhs); } #if _LIBCPP_STD_VER <= 17 // Duration != template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator!=(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return !(__lhs == __rhs); } #endif // _LIBCPP_STD_VER <= 17 // Duration < template <class _LhsDuration, class _RhsDuration> struct __duration_lt { _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs) const { typedef typename common_type<_LhsDuration, _RhsDuration>::type _Ct; return _Ct(__lhs).count() < _Ct(__rhs).count(); } }; template <class _LhsDuration> struct __duration_lt<_LhsDuration, _LhsDuration> { _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs) const { return __lhs.count() < __rhs.count(); } }; template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator<(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return __duration_lt<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >()(__lhs, __rhs); } // Duration > template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator>(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return __rhs < __lhs; } // Duration <= template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator<=(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return !(__rhs < __lhs); } // Duration >= template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator>=(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { return !(__lhs < __rhs); } #if _LIBCPP_STD_VER >= 20 template <class _Rep1, class _Period1, class _Rep2, class _Period2> requires three_way_comparable<common_type_t<_Rep1, _Rep2>> _LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { using _Ct = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>; return _Ct(__lhs).count() <=> _Ct(__rhs).count(); } #endif // _LIBCPP_STD_VER >= 20 // Duration + template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >::type operator+(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >::type _Cd; return _Cd(_Cd(__lhs).count() + _Cd(__rhs).count()); } // Duration - template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >::type operator-(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >::type _Cd; return _Cd(_Cd(__lhs).count() - _Cd(__rhs).count()); } // Duration * template <class _Rep1, class _Period, class _Rep2, __enable_if_t<is_convertible<const _Rep2&, typename common_type<_Rep1, _Rep2>::type>::value, int> = 0> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR duration<typename common_type<_Rep1, _Rep2>::type, _Period> operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s) { typedef typename common_type<_Rep1, _Rep2>::type _Cr; typedef duration<_Cr, _Period> _Cd; return _Cd(_Cd(__d).count() * static_cast<_Cr>(__s)); } template <class _Rep1, class _Period, class _Rep2, __enable_if_t<is_convertible<const _Rep1&, typename common_type<_Rep1, _Rep2>::type>::value, int> = 0> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR duration<typename common_type<_Rep1, _Rep2>::type, _Period> operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d) { return __d * __s; } // Duration / template <class _Rep1, class _Period, class _Rep2, __enable_if_t<!__is_duration<_Rep2>::value && is_convertible<const _Rep2&, typename common_type<_Rep1, _Rep2>::type>::value, int> = 0> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR duration<typename common_type<_Rep1, _Rep2>::type, _Period> operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s) { typedef typename common_type<_Rep1, _Rep2>::type _Cr; typedef duration<_Cr, _Period> _Cd; return _Cd(_Cd(__d).count() / static_cast<_Cr>(__s)); } template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR typename common_type<_Rep1, _Rep2>::type operator/(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >::type _Ct; return _Ct(__lhs).count() / _Ct(__rhs).count(); } // Duration % template <class _Rep1, class _Period, class _Rep2, __enable_if_t<!__is_duration<_Rep2>::value && is_convertible<const _Rep2&, typename common_type<_Rep1, _Rep2>::type>::value, int> = 0> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR duration<typename common_type<_Rep1, _Rep2>::type, _Period> operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s) { typedef typename common_type<_Rep1, _Rep2>::type _Cr; typedef duration<_Cr, _Period> _Cd; return _Cd(_Cd(__d).count() % static_cast<_Cr>(__s)); } template <class _Rep1, class _Period1, class _Rep2, class _Period2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >::type operator%(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2>& __rhs) { typedef typename common_type<_Rep1, _Rep2>::type _Cr; typedef typename common_type<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >::type _Cd; return _Cd(static_cast<_Cr>(_Cd(__lhs).count()) % static_cast<_Cr>(_Cd(__rhs).count())); } } // namespace chrono #if _LIBCPP_STD_VER >= 14 // Suffixes for duration literals [time.duration.literals] inline namespace literals { inline namespace chrono_literals { _LIBCPP_HIDE_FROM_ABI constexpr chrono::hours operator""h(unsigned long long __h) { return chrono::hours(static_cast<chrono::hours::rep>(__h)); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::duration<long double, ratio<3600, 1>> operator""h(long double __h) { return chrono::duration<long double, ratio<3600, 1>>(__h); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::minutes operator""min(unsigned long long __m) { return chrono::minutes(static_cast<chrono::minutes::rep>(__m)); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::duration<long double, ratio<60, 1>> operator""min(long double __m) { return chrono::duration<long double, ratio<60, 1>>(__m); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::seconds operator""s(unsigned long long __s) { return chrono::seconds(static_cast<chrono::seconds::rep>(__s)); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::duration<long double> operator""s(long double __s) { return chrono::duration<long double>(__s); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::milliseconds operator""ms(unsigned long long __ms) { return chrono::milliseconds(static_cast<chrono::milliseconds::rep>(__ms)); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::duration<long double, milli> operator""ms(long double __ms) { return chrono::duration<long double, milli>(__ms); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::microseconds operator""us(unsigned long long __us) { return chrono::microseconds(static_cast<chrono::microseconds::rep>(__us)); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::duration<long double, micro> operator""us(long double __us) { return chrono::duration<long double, micro>(__us); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::nanoseconds operator""ns(unsigned long long __ns) { return chrono::nanoseconds(static_cast<chrono::nanoseconds::rep>(__ns)); } _LIBCPP_HIDE_FROM_ABI constexpr chrono::duration<long double, nano> operator""ns(long double __ns) { return chrono::duration<long double, nano>(__ns); } } // namespace chrono_literals } // namespace literals namespace chrono { // hoist the literals into namespace std::chrono using namespace literals::chrono_literals; } // namespace chrono #endif // _LIBCPP_STD_VER >= 14 _LIBCPP_END_NAMESPACE_STD _LIBCPP_POP_MACROS #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 # include <type_traits> #endif #endif // _LIBCPP___CHRONO_DURATION_H