forked from KolibriOS/kolibrios
888 lines
26 KiB
C++
888 lines
26 KiB
C++
// <chrono> -*- C++ -*-
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// Copyright (C) 2008-2015 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/chrono
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_CHRONO
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#define _GLIBCXX_CHRONO 1
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#pragma GCC system_header
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
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#else
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#include <ratio>
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#include <type_traits>
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#include <limits>
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#include <ctime>
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#include <bits/parse_numbers.h> // for literals support.
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#ifdef _GLIBCXX_USE_C99_STDINT_TR1
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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/**
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* @defgroup chrono Time
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* @ingroup utilities
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*
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* Classes and functions for time.
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* @{
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*/
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/** @namespace std::chrono
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* @brief ISO C++ 2011 entities sub-namespace for time and date.
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*/
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namespace chrono
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<typename _Rep, typename _Period = ratio<1>>
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struct duration;
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template<typename _Clock, typename _Dur = typename _Clock::duration>
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struct time_point;
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_GLIBCXX_END_NAMESPACE_VERSION
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}
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)
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template<typename _CT, typename _Period1, typename _Period2>
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struct __duration_common_type_wrapper
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{
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private:
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typedef __static_gcd<_Period1::num, _Period2::num> __gcd_num;
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typedef __static_gcd<_Period1::den, _Period2::den> __gcd_den;
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typedef typename _CT::type __cr;
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typedef ratio<__gcd_num::value,
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(_Period1::den / __gcd_den::value) * _Period2::den> __r;
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public:
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typedef __success_type<chrono::duration<__cr, __r>> type;
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};
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template<typename _Period1, typename _Period2>
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struct __duration_common_type_wrapper<__failure_type, _Period1, _Period2>
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{ typedef __failure_type type; };
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template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
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struct common_type<chrono::duration<_Rep1, _Period1>,
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chrono::duration<_Rep2, _Period2>>
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: public __duration_common_type_wrapper<typename __member_type_wrapper<
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common_type<_Rep1, _Rep2>>::type, _Period1, _Period2>::type
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{ };
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// 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)
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template<typename _CT, typename _Clock>
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struct __timepoint_common_type_wrapper
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{
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typedef __success_type<chrono::time_point<_Clock, typename _CT::type>>
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type;
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};
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template<typename _Clock>
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struct __timepoint_common_type_wrapper<__failure_type, _Clock>
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{ typedef __failure_type type; };
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template<typename _Clock, typename _Duration1, typename _Duration2>
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struct common_type<chrono::time_point<_Clock, _Duration1>,
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chrono::time_point<_Clock, _Duration2>>
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: public __timepoint_common_type_wrapper<typename __member_type_wrapper<
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common_type<_Duration1, _Duration2>>::type, _Clock>::type
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{ };
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_GLIBCXX_END_NAMESPACE_VERSION
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namespace chrono
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Primary template for duration_cast impl.
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template<typename _ToDur, typename _CF, typename _CR,
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bool _NumIsOne = false, bool _DenIsOne = false>
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struct __duration_cast_impl
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{
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template<typename _Rep, typename _Period>
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static constexpr _ToDur
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__cast(const duration<_Rep, _Period>& __d)
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{
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typedef typename _ToDur::rep __to_rep;
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return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count())
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* static_cast<_CR>(_CF::num)
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/ static_cast<_CR>(_CF::den)));
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}
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};
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template<typename _ToDur, typename _CF, typename _CR>
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struct __duration_cast_impl<_ToDur, _CF, _CR, true, true>
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{
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template<typename _Rep, typename _Period>
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static constexpr _ToDur
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__cast(const duration<_Rep, _Period>& __d)
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{
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typedef typename _ToDur::rep __to_rep;
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return _ToDur(static_cast<__to_rep>(__d.count()));
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}
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};
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template<typename _ToDur, typename _CF, typename _CR>
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struct __duration_cast_impl<_ToDur, _CF, _CR, true, false>
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{
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template<typename _Rep, typename _Period>
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static constexpr _ToDur
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__cast(const duration<_Rep, _Period>& __d)
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{
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typedef typename _ToDur::rep __to_rep;
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return _ToDur(static_cast<__to_rep>(
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static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den)));
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}
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};
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template<typename _ToDur, typename _CF, typename _CR>
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struct __duration_cast_impl<_ToDur, _CF, _CR, false, true>
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{
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template<typename _Rep, typename _Period>
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static constexpr _ToDur
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__cast(const duration<_Rep, _Period>& __d)
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{
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typedef typename _ToDur::rep __to_rep;
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return _ToDur(static_cast<__to_rep>(
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static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
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}
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};
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template<typename _Tp>
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struct __is_duration
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: std::false_type
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{ };
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template<typename _Rep, typename _Period>
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struct __is_duration<duration<_Rep, _Period>>
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: std::true_type
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{ };
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/// duration_cast
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template<typename _ToDur, typename _Rep, typename _Period>
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constexpr typename enable_if<__is_duration<_ToDur>::value,
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_ToDur>::type
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duration_cast(const duration<_Rep, _Period>& __d)
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{
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typedef typename _ToDur::period __to_period;
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typedef typename _ToDur::rep __to_rep;
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typedef ratio_divide<_Period, __to_period> __cf;
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typedef typename common_type<__to_rep, _Rep, intmax_t>::type
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__cr;
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typedef __duration_cast_impl<_ToDur, __cf, __cr,
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__cf::num == 1, __cf::den == 1> __dc;
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return __dc::__cast(__d);
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}
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/// treat_as_floating_point
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template<typename _Rep>
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struct treat_as_floating_point
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: is_floating_point<_Rep>
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{ };
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/// duration_values
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template<typename _Rep>
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struct duration_values
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{
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static constexpr _Rep
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zero()
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{ return _Rep(0); }
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static constexpr _Rep
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max()
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{ return numeric_limits<_Rep>::max(); }
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static constexpr _Rep
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min()
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{ return numeric_limits<_Rep>::lowest(); }
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};
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template<typename _Tp>
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struct __is_ratio
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: std::false_type
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{ };
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template<intmax_t _Num, intmax_t _Den>
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struct __is_ratio<ratio<_Num, _Den>>
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: std::true_type
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{ };
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/// duration
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template<typename _Rep, typename _Period>
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struct duration
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{
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typedef _Rep rep;
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typedef _Period period;
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static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
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static_assert(__is_ratio<_Period>::value,
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"period must be a specialization of ratio");
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static_assert(_Period::num > 0, "period must be positive");
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// 20.11.5.1 construction / copy / destroy
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constexpr duration() = default;
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// NB: Make constexpr implicit. This cannot be explicitly
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// constexpr, as any UDT that is not a literal type with a
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// constexpr copy constructor will be ill-formed.
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duration(const duration&) = default;
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template<typename _Rep2, typename = typename
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enable_if<is_convertible<_Rep2, rep>::value
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&& (treat_as_floating_point<rep>::value
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|| !treat_as_floating_point<_Rep2>::value)>::type>
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constexpr explicit duration(const _Rep2& __rep)
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: __r(static_cast<rep>(__rep)) { }
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template<typename _Rep2, typename _Period2, typename = typename
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enable_if<treat_as_floating_point<rep>::value
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|| (ratio_divide<_Period2, period>::den == 1
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&& !treat_as_floating_point<_Rep2>::value)>::type>
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constexpr duration(const duration<_Rep2, _Period2>& __d)
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: __r(duration_cast<duration>(__d).count()) { }
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~duration() = default;
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duration& operator=(const duration&) = default;
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// 20.11.5.2 observer
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constexpr rep
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count() const
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{ return __r; }
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// 20.11.5.3 arithmetic
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constexpr duration
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operator+() const
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{ return *this; }
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constexpr duration
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operator-() const
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{ return duration(-__r); }
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duration&
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operator++()
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{
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++__r;
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return *this;
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}
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duration
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operator++(int)
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{ return duration(__r++); }
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duration&
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operator--()
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{
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--__r;
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return *this;
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}
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duration
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operator--(int)
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{ return duration(__r--); }
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duration&
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operator+=(const duration& __d)
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{
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__r += __d.count();
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return *this;
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}
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duration&
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operator-=(const duration& __d)
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{
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__r -= __d.count();
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return *this;
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}
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duration&
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operator*=(const rep& __rhs)
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{
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__r *= __rhs;
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return *this;
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}
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duration&
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operator/=(const rep& __rhs)
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{
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__r /= __rhs;
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return *this;
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}
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// DR 934.
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template<typename _Rep2 = rep>
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typename enable_if<!treat_as_floating_point<_Rep2>::value,
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duration&>::type
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operator%=(const rep& __rhs)
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{
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__r %= __rhs;
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return *this;
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}
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template<typename _Rep2 = rep>
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typename enable_if<!treat_as_floating_point<_Rep2>::value,
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duration&>::type
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operator%=(const duration& __d)
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{
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__r %= __d.count();
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return *this;
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}
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// 20.11.5.4 special values
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static constexpr duration
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zero()
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{ return duration(duration_values<rep>::zero()); }
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static constexpr duration
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min()
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{ return duration(duration_values<rep>::min()); }
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static constexpr duration
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max()
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{ return duration(duration_values<rep>::max()); }
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private:
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rep __r;
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};
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr typename common_type<duration<_Rep1, _Period1>,
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duration<_Rep2, _Period2>>::type
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operator+(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{
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typedef duration<_Rep1, _Period1> __dur1;
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typedef duration<_Rep2, _Period2> __dur2;
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typedef typename common_type<__dur1,__dur2>::type __cd;
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return __cd(__cd(__lhs).count() + __cd(__rhs).count());
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}
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr typename common_type<duration<_Rep1, _Period1>,
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duration<_Rep2, _Period2>>::type
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operator-(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{
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typedef duration<_Rep1, _Period1> __dur1;
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typedef duration<_Rep2, _Period2> __dur2;
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typedef typename common_type<__dur1,__dur2>::type __cd;
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return __cd(__cd(__lhs).count() - __cd(__rhs).count());
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}
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template<typename _Rep1, typename _Rep2, bool =
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is_convertible<_Rep2,
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typename common_type<_Rep1, _Rep2>::type>::value>
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struct __common_rep_type { };
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template<typename _Rep1, typename _Rep2>
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struct __common_rep_type<_Rep1, _Rep2, true>
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{ typedef typename common_type<_Rep1, _Rep2>::type type; };
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template<typename _Rep1, typename _Period, typename _Rep2>
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constexpr
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duration<typename __common_rep_type<_Rep1, _Rep2>::type, _Period>
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operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
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{
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typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
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__cd;
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return __cd(__cd(__d).count() * __s);
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}
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template<typename _Rep1, typename _Rep2, typename _Period>
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constexpr
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duration<typename __common_rep_type<_Rep2, _Rep1>::type, _Period>
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operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)
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{ return __d * __s; }
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template<typename _Rep1, typename _Period, typename _Rep2>
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constexpr duration<typename __common_rep_type<_Rep1, typename
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enable_if<!__is_duration<_Rep2>::value, _Rep2>::type>::type, _Period>
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operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
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{
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typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
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__cd;
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return __cd(__cd(__d).count() / __s);
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}
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr typename common_type<_Rep1, _Rep2>::type
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operator/(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{
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typedef duration<_Rep1, _Period1> __dur1;
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typedef duration<_Rep2, _Period2> __dur2;
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typedef typename common_type<__dur1,__dur2>::type __cd;
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return __cd(__lhs).count() / __cd(__rhs).count();
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}
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// DR 934.
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template<typename _Rep1, typename _Period, typename _Rep2>
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constexpr duration<typename __common_rep_type<_Rep1, typename
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enable_if<!__is_duration<_Rep2>::value, _Rep2>::type>::type, _Period>
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operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
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{
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typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
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__cd;
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return __cd(__cd(__d).count() % __s);
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}
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr typename common_type<duration<_Rep1, _Period1>,
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duration<_Rep2, _Period2>>::type
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operator%(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{
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typedef duration<_Rep1, _Period1> __dur1;
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typedef duration<_Rep2, _Period2> __dur2;
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typedef typename common_type<__dur1,__dur2>::type __cd;
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return __cd(__cd(__lhs).count() % __cd(__rhs).count());
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}
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// comparisons
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr bool
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operator==(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{
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typedef duration<_Rep1, _Period1> __dur1;
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typedef duration<_Rep2, _Period2> __dur2;
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typedef typename common_type<__dur1,__dur2>::type __ct;
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return __ct(__lhs).count() == __ct(__rhs).count();
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}
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr bool
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operator<(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{
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typedef duration<_Rep1, _Period1> __dur1;
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typedef duration<_Rep2, _Period2> __dur2;
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typedef typename common_type<__dur1,__dur2>::type __ct;
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return __ct(__lhs).count() < __ct(__rhs).count();
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}
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr bool
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operator!=(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{ return !(__lhs == __rhs); }
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr bool
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operator<=(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{ return !(__rhs < __lhs); }
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr bool
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operator>(const duration<_Rep1, _Period1>& __lhs,
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const duration<_Rep2, _Period2>& __rhs)
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{ 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>
|
|
constexpr time_point(const time_point<clock, _Dur2>& __t)
|
|
: __d(__t.time_since_epoch())
|
|
{ }
|
|
|
|
// observer
|
|
constexpr duration
|
|
time_since_epoch() const
|
|
{ return __d; }
|
|
|
|
// arithmetic
|
|
time_point&
|
|
operator+=(const duration& __dur)
|
|
{
|
|
__d += __dur;
|
|
return *this;
|
|
}
|
|
|
|
time_point&
|
|
operator-=(const duration& __dur)
|
|
{
|
|
__d -= __dur;
|
|
return *this;
|
|
}
|
|
|
|
// special values
|
|
static constexpr time_point
|
|
min()
|
|
{ return time_point(duration::min()); }
|
|
|
|
static constexpr time_point
|
|
max()
|
|
{ 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()));
|
|
}
|
|
|
|
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 higest
|
|
// 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
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace chrono
|
|
|
|
#if __cplusplus > 201103L
|
|
|
|
#define __cpp_lib_chrono_udls 201304
|
|
|
|
inline namespace literals
|
|
{
|
|
inline namespace chrono_literals
|
|
{
|
|
|
|
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...>(); }
|
|
|
|
} // inline namespace chrono_literals
|
|
} // inline namespace literals
|
|
|
|
namespace chrono
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
using namespace literals::chrono_literals;
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace chrono
|
|
|
|
#endif // __cplusplus > 201103L
|
|
|
|
// @} group chrono
|
|
} // namespace std
|
|
|
|
#endif //_GLIBCXX_USE_C99_STDINT_TR1
|
|
|
|
#endif // C++11
|
|
|
|
#endif //_GLIBCXX_CHRONO
|