713 lines
20 KiB
C++
713 lines
20 KiB
C++
// <chrono> -*- C++ -*-
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// Copyright (C) 2008, 2009, 2010 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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#ifndef __GXX_EXPERIMENTAL_CXX0X__
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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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#ifdef _GLIBCXX_USE_C99_STDINT_TR1
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_GLIBCXX_BEGIN_NAMESPACE(std)
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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++ 0x 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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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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}
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// 20.8.2.3 specialization of common_type (for duration)
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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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{
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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 common_type<_Rep1, _Rep2>::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 chrono::duration<__cr, __r> type;
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};
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// 20.8.2.3 specialization of common_type (for time_point)
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template<typename _Clock, typename _Dur1, typename _Dur2>
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struct common_type<chrono::time_point<_Clock, _Dur1>,
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chrono::time_point<_Clock, _Dur2>>
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{
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private:
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typedef typename common_type<_Dur1, _Dur2>::type __ct;
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public:
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typedef chrono::time_point<_Clock, __ct> type;
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};
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namespace chrono
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{
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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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inline 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> __r_div;
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typedef typename __r_div::type __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>::min(); }
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};
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template<typename T>
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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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// 20.8.3.1 construction / copy / destroy
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constexpr duration() : __r() { }
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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>::type::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(const duration&) = default;
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duration& operator=(const duration&) = default;
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// 20.8.3.2 observer
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constexpr rep
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count() const
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{ return __r; }
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// 20.8.3.3 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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// 20.8.3.4 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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inline 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 __ct;
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return __ct(__lhs) += __rhs;
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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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inline 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 __ct;
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return __ct(__lhs) -= __rhs;
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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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inline 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 typename common_type<_Rep1, _Rep2>::type __cr;
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return duration<__cr, _Period>(__d) *= __s;
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}
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template<typename _Rep1, typename _Period, typename _Rep2>
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inline 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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inline 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 typename common_type<_Rep1, _Rep2>::type __cr;
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return duration<__cr, _Period>(__d) /= __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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inline 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 __ct;
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return __ct(__lhs).count() / __ct(__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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inline 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 typename common_type<_Rep1, _Rep2>::type __cr;
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return duration<__cr, _Period>(__d) %= __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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inline 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 __ct;
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return __ct(__lhs) %= __rhs;
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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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inline 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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inline 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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inline 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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inline 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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inline 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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inline 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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/// nanoseconds
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typedef duration<int64_t, nano> nanoseconds;
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/// microseconds
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typedef duration<int64_t, micro> microseconds;
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/// milliseconds
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typedef duration<int64_t, milli> milliseconds;
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/// seconds
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typedef duration<int64_t> seconds;
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/// minutes
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typedef duration<int, ratio< 60>> minutes;
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/// hours
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typedef duration<int, ratio<3600>> hours;
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/// time_point
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template<typename _Clock, typename _Dur>
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struct time_point
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{
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typedef _Clock clock;
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typedef _Dur duration;
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typedef typename duration::rep rep;
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typedef typename duration::period period;
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constexpr time_point() : __d(duration::zero())
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{ }
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constexpr explicit time_point(const duration& __dur)
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: __d(__dur)
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{ }
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// conversions
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template<typename _Dur2>
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constexpr time_point(const time_point<clock, _Dur2>& __t)
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: __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>
|
|
inline 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>
|
|
inline 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) += __rhs;
|
|
}
|
|
|
|
template<typename _Rep1, typename _Period1,
|
|
typename _Clock, typename _Dur2>
|
|
inline time_point<_Clock,
|
|
typename common_type<duration<_Rep1, _Period1>, _Dur2>::type>
|
|
operator+(const duration<_Rep1, _Period1>& __lhs,
|
|
const time_point<_Clock, _Dur2>& __rhs)
|
|
{ return __rhs + __lhs; }
|
|
|
|
template<typename _Clock, typename _Dur1,
|
|
typename _Rep2, typename _Period2>
|
|
inline time_point<_Clock,
|
|
typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
|
|
operator-(const time_point<_Clock, _Dur1>& __lhs,
|
|
const duration<_Rep2, _Period2>& __rhs)
|
|
{ return __lhs + (-__rhs); }
|
|
|
|
template<typename _Clock, typename _Dur1, typename _Dur2>
|
|
inline 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>
|
|
inline 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>
|
|
inline 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>
|
|
inline 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>
|
|
inline 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>
|
|
inline 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>
|
|
inline constexpr bool
|
|
operator>=(const time_point<_Clock, _Dur1>& __lhs,
|
|
const time_point<_Clock, _Dur2>& __rhs)
|
|
{ return !(__lhs < __rhs); }
|
|
|
|
/// system_clock
|
|
struct system_clock
|
|
{
|
|
#ifdef _GLIBCXX_USE_CLOCK_REALTIME
|
|
typedef chrono::nanoseconds duration;
|
|
#elif defined(_GLIBCXX_USE_GETTIMEOFDAY)
|
|
typedef chrono::microseconds duration;
|
|
#else
|
|
typedef chrono::seconds duration;
|
|
#endif
|
|
|
|
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_monotonic = false;
|
|
|
|
static time_point
|
|
now() throw ();
|
|
|
|
// Map to C API
|
|
static std::time_t
|
|
to_time_t(const time_point& __t)
|
|
{
|
|
return std::time_t(duration_cast<chrono::seconds>
|
|
(__t.time_since_epoch()).count());
|
|
}
|
|
|
|
static time_point
|
|
from_time_t(std::time_t __t)
|
|
{
|
|
typedef chrono::time_point<system_clock, seconds> __from;
|
|
return time_point_cast<system_clock::duration>
|
|
(__from(chrono::seconds(__t)));
|
|
}
|
|
};
|
|
|
|
#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
|
|
/// monotonic_clock
|
|
struct monotonic_clock
|
|
{
|
|
typedef chrono::nanoseconds duration;
|
|
typedef duration::rep rep;
|
|
typedef duration::period period;
|
|
typedef chrono::time_point<monotonic_clock, duration> time_point;
|
|
|
|
static constexpr bool is_monotonic = true;
|
|
|
|
static time_point
|
|
now();
|
|
};
|
|
#else
|
|
typedef system_clock monotonic_clock;
|
|
#endif
|
|
|
|
typedef system_clock high_resolution_clock;
|
|
} // namespace chrono
|
|
|
|
// @} group chrono
|
|
_GLIBCXX_END_NAMESPACE
|
|
|
|
#endif //_GLIBCXX_USE_C99_STDINT_TR1
|
|
|
|
#endif //__GXX_EXPERIMENTAL_CXX0X__
|
|
|
|
#endif //_GLIBCXX_CHRONO
|