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- // <chrono> -*- C++ -*-
- // Copyright (C) 2008-2016 Free Software Foundation, Inc.
- //
- // This file is part of the GNU ISO C++ Library. This library is free
- // software; you can redistribute it and/or modify it under the
- // terms of the GNU General Public License as published by the
- // Free Software Foundation; either version 3, or (at your option)
- // any later version.
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // Under Section 7 of GPL version 3, you are granted additional
- // permissions described in the GCC Runtime Library Exception, version
- // 3.1, as published by the Free Software Foundation.
- // You should have received a copy of the GNU General Public License and
- // a copy of the GCC Runtime Library Exception along with this program;
- // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
- // <http://www.gnu.org/licenses/>.
- /** @file include/chrono
- * This is a Standard C++ Library header.
- */
- #ifndef _GLIBCXX_CHRONO
- #define _GLIBCXX_CHRONO 1
- #pragma GCC system_header
- #if __cplusplus < 201103L
- # include <bits/c++0x_warning.h>
- #else
- #include <ratio>
- #include <type_traits>
- #include <limits>
- #include <ctime>
- #include <bits/parse_numbers.h> // for literals support.
- #ifdef _GLIBCXX_USE_C99_STDINT_TR1
- namespace std _GLIBCXX_VISIBILITY(default)
- {
- /**
- * @defgroup chrono Time
- * @ingroup utilities
- *
- * Classes and functions for time.
- * @{
- */
- /** @namespace std::chrono
- * @brief ISO C++ 2011 entities sub-namespace for time and date.
- */
- namespace chrono
- {
- _GLIBCXX_BEGIN_NAMESPACE_VERSION
- template<typename _Rep, typename _Period = ratio<1>>
- struct duration;
- template<typename _Clock, typename _Dur = typename _Clock::duration>
- struct time_point;
- _GLIBCXX_END_NAMESPACE_VERSION
- }
- _GLIBCXX_BEGIN_NAMESPACE_VERSION
- // 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)
- template<typename _CT, typename _Period1, typename _Period2>
- struct __duration_common_type_wrapper
- {
- private:
- typedef __static_gcd<_Period1::num, _Period2::num> __gcd_num;
- typedef __static_gcd<_Period1::den, _Period2::den> __gcd_den;
- typedef typename _CT::type __cr;
- typedef ratio<__gcd_num::value,
- (_Period1::den / __gcd_den::value) * _Period2::den> __r;
- public:
- typedef __success_type<chrono::duration<__cr, __r>> type;
- };
- template<typename _Period1, typename _Period2>
- struct __duration_common_type_wrapper<__failure_type, _Period1, _Period2>
- { typedef __failure_type type; };
- template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
- struct common_type<chrono::duration<_Rep1, _Period1>,
- chrono::duration<_Rep2, _Period2>>
- : public __duration_common_type_wrapper<typename __member_type_wrapper<
- common_type<_Rep1, _Rep2>>::type, _Period1, _Period2>::type
- { };
- // 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)
- template<typename _CT, typename _Clock>
- struct __timepoint_common_type_wrapper
- {
- typedef __success_type<chrono::time_point<_Clock, typename _CT::type>>
- type;
- };
- template<typename _Clock>
- struct __timepoint_common_type_wrapper<__failure_type, _Clock>
- { typedef __failure_type type; };
- template<typename _Clock, typename _Duration1, typename _Duration2>
- struct common_type<chrono::time_point<_Clock, _Duration1>,
- chrono::time_point<_Clock, _Duration2>>
- : public __timepoint_common_type_wrapper<typename __member_type_wrapper<
- common_type<_Duration1, _Duration2>>::type, _Clock>::type
- { };
- _GLIBCXX_END_NAMESPACE_VERSION
- namespace chrono
- {
- _GLIBCXX_BEGIN_NAMESPACE_VERSION
- // Primary template for duration_cast impl.
- template<typename _ToDur, typename _CF, typename _CR,
- bool _NumIsOne = false, bool _DenIsOne = false>
- struct __duration_cast_impl
- {
- template<typename _Rep, typename _Period>
- static constexpr _ToDur
- __cast(const duration<_Rep, _Period>& __d)
- {
- typedef typename _ToDur::rep __to_rep;
- return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count())
- * static_cast<_CR>(_CF::num)
- / static_cast<_CR>(_CF::den)));
- }
- };
- template<typename _ToDur, typename _CF, typename _CR>
- struct __duration_cast_impl<_ToDur, _CF, _CR, true, true>
- {
- template<typename _Rep, typename _Period>
- static constexpr _ToDur
- __cast(const duration<_Rep, _Period>& __d)
- {
- typedef typename _ToDur::rep __to_rep;
- return _ToDur(static_cast<__to_rep>(__d.count()));
- }
- };
- template<typename _ToDur, typename _CF, typename _CR>
- struct __duration_cast_impl<_ToDur, _CF, _CR, true, false>
- {
- template<typename _Rep, typename _Period>
- static constexpr _ToDur
- __cast(const duration<_Rep, _Period>& __d)
- {
- typedef typename _ToDur::rep __to_rep;
- return _ToDur(static_cast<__to_rep>(
- static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den)));
- }
- };
- template<typename _ToDur, typename _CF, typename _CR>
- struct __duration_cast_impl<_ToDur, _CF, _CR, false, true>
- {
- template<typename _Rep, typename _Period>
- static constexpr _ToDur
- __cast(const duration<_Rep, _Period>& __d)
- {
- typedef typename _ToDur::rep __to_rep;
- return _ToDur(static_cast<__to_rep>(
- static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
- }
- };
- template<typename _Tp>
- struct __is_duration
- : std::false_type
- { };
- template<typename _Rep, typename _Period>
- struct __is_duration<duration<_Rep, _Period>>
- : std::true_type
- { };
- /// duration_cast
- template<typename _ToDur, typename _Rep, typename _Period>
- constexpr typename enable_if<__is_duration<_ToDur>::value,
- _ToDur>::type
- duration_cast(const duration<_Rep, _Period>& __d)
- {
- typedef typename _ToDur::period __to_period;
- typedef typename _ToDur::rep __to_rep;
- typedef ratio_divide<_Period, __to_period> __cf;
- typedef typename common_type<__to_rep, _Rep, intmax_t>::type
- __cr;
- typedef __duration_cast_impl<_ToDur, __cf, __cr,
- __cf::num == 1, __cf::den == 1> __dc;
- return __dc::__cast(__d);
- }
- /// treat_as_floating_point
- template<typename _Rep>
- struct treat_as_floating_point
- : is_floating_point<_Rep>
- { };
- /// duration_values
- template<typename _Rep>
- struct duration_values
- {
- static constexpr _Rep
- zero()
- { return _Rep(0); }
- static constexpr _Rep
- max()
- { return numeric_limits<_Rep>::max(); }
- static constexpr _Rep
- min()
- { return numeric_limits<_Rep>::lowest(); }
- };
- template<typename _Tp>
- struct __is_ratio
- : std::false_type
- { };
- template<intmax_t _Num, intmax_t _Den>
- struct __is_ratio<ratio<_Num, _Den>>
- : std::true_type
- { };
- /// duration
- template<typename _Rep, typename _Period>
- struct duration
- {
- typedef _Rep rep;
- typedef _Period period;
- static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
- static_assert(__is_ratio<_Period>::value,
- "period must be a specialization of ratio");
- static_assert(_Period::num > 0, "period must be positive");
- // 20.11.5.1 construction / copy / destroy
- constexpr duration() = default;
- // NB: Make constexpr implicit. This cannot be explicitly
- // constexpr, as any UDT that is not a literal type with a
- // constexpr copy constructor will be ill-formed.
- duration(const duration&) = default;
- template<typename _Rep2, typename = typename
- enable_if<is_convertible<_Rep2, rep>::value
- && (treat_as_floating_point<rep>::value
- || !treat_as_floating_point<_Rep2>::value)>::type>
- constexpr explicit duration(const _Rep2& __rep)
- : __r(static_cast<rep>(__rep)) { }
- template<typename _Rep2, typename _Period2, typename = typename
- enable_if<treat_as_floating_point<rep>::value
- || (ratio_divide<_Period2, period>::den == 1
- && !treat_as_floating_point<_Rep2>::value)>::type>
- constexpr duration(const duration<_Rep2, _Period2>& __d)
- : __r(duration_cast<duration>(__d).count()) { }
- ~duration() = default;
- duration& operator=(const duration&) = default;
- // 20.11.5.2 observer
- constexpr rep
- count() const
- { return __r; }
- // 20.11.5.3 arithmetic
- constexpr duration
- operator+() const
- { return *this; }
- constexpr duration
- operator-() const
- { return duration(-__r); }
- duration&
- operator++()
- {
- ++__r;
- return *this;
- }
- duration
- operator++(int)
- { return duration(__r++); }
- duration&
- operator--()
- {
- --__r;
- return *this;
- }
- duration
- operator--(int)
- { return duration(__r--); }
- duration&
- operator+=(const duration& __d)
- {
- __r += __d.count();
- return *this;
- }
- duration&
- operator-=(const duration& __d)
- {
- __r -= __d.count();
- return *this;
- }
- duration&
- operator*=(const rep& __rhs)
- {
- __r *= __rhs;
- return *this;
- }
- duration&
- operator/=(const rep& __rhs)
- {
- __r /= __rhs;
- return *this;
- }
- // DR 934.
- template<typename _Rep2 = rep>
- typename enable_if<!treat_as_floating_point<_Rep2>::value,
- duration&>::type
- operator%=(const rep& __rhs)
- {
- __r %= __rhs;
- return *this;
- }
- template<typename _Rep2 = rep>
- typename enable_if<!treat_as_floating_point<_Rep2>::value,
- duration&>::type
- operator%=(const duration& __d)
- {
- __r %= __d.count();
- return *this;
- }
- // 20.11.5.4 special values
- static constexpr duration
- zero()
- { return duration(duration_values<rep>::zero()); }
- static constexpr duration
- min()
- { return duration(duration_values<rep>::min()); }
- static constexpr duration
- max()
- { return duration(duration_values<rep>::max()); }
- private:
- rep __r;
- };
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr typename common_type<duration<_Rep1, _Period1>,
- duration<_Rep2, _Period2>>::type
- operator+(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- {
- typedef duration<_Rep1, _Period1> __dur1;
- typedef duration<_Rep2, _Period2> __dur2;
- typedef typename common_type<__dur1,__dur2>::type __cd;
- return __cd(__cd(__lhs).count() + __cd(__rhs).count());
- }
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr typename common_type<duration<_Rep1, _Period1>,
- duration<_Rep2, _Period2>>::type
- operator-(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- {
- typedef duration<_Rep1, _Period1> __dur1;
- typedef duration<_Rep2, _Period2> __dur2;
- typedef typename common_type<__dur1,__dur2>::type __cd;
- return __cd(__cd(__lhs).count() - __cd(__rhs).count());
- }
- template<typename _Rep1, typename _Rep2, bool =
- is_convertible<_Rep2,
- typename common_type<_Rep1, _Rep2>::type>::value>
- struct __common_rep_type { };
- template<typename _Rep1, typename _Rep2>
- struct __common_rep_type<_Rep1, _Rep2, true>
- { typedef typename common_type<_Rep1, _Rep2>::type type; };
- template<typename _Rep1, typename _Period, typename _Rep2>
- constexpr
- duration<typename __common_rep_type<_Rep1, _Rep2>::type, _Period>
- operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
- {
- typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
- __cd;
- return __cd(__cd(__d).count() * __s);
- }
- template<typename _Rep1, typename _Rep2, typename _Period>
- constexpr
- duration<typename __common_rep_type<_Rep2, _Rep1>::type, _Period>
- operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)
- { return __d * __s; }
- template<typename _Rep1, typename _Period, typename _Rep2>
- constexpr duration<typename __common_rep_type<_Rep1, typename
- enable_if<!__is_duration<_Rep2>::value, _Rep2>::type>::type, _Period>
- operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
- {
- typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
- __cd;
- return __cd(__cd(__d).count() / __s);
- }
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr typename common_type<_Rep1, _Rep2>::type
- operator/(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- {
- typedef duration<_Rep1, _Period1> __dur1;
- typedef duration<_Rep2, _Period2> __dur2;
- typedef typename common_type<__dur1,__dur2>::type __cd;
- return __cd(__lhs).count() / __cd(__rhs).count();
- }
- // DR 934.
- template<typename _Rep1, typename _Period, typename _Rep2>
- constexpr duration<typename __common_rep_type<_Rep1, typename
- enable_if<!__is_duration<_Rep2>::value, _Rep2>::type>::type, _Period>
- operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
- {
- typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
- __cd;
- return __cd(__cd(__d).count() % __s);
- }
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr typename common_type<duration<_Rep1, _Period1>,
- duration<_Rep2, _Period2>>::type
- operator%(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- {
- typedef duration<_Rep1, _Period1> __dur1;
- typedef duration<_Rep2, _Period2> __dur2;
- typedef typename common_type<__dur1,__dur2>::type __cd;
- return __cd(__cd(__lhs).count() % __cd(__rhs).count());
- }
- // comparisons
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr bool
- operator==(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- {
- typedef duration<_Rep1, _Period1> __dur1;
- typedef duration<_Rep2, _Period2> __dur2;
- typedef typename common_type<__dur1,__dur2>::type __ct;
- return __ct(__lhs).count() == __ct(__rhs).count();
- }
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr bool
- operator<(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- {
- typedef duration<_Rep1, _Period1> __dur1;
- typedef duration<_Rep2, _Period2> __dur2;
- typedef typename common_type<__dur1,__dur2>::type __ct;
- return __ct(__lhs).count() < __ct(__rhs).count();
- }
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr bool
- operator!=(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- { return !(__lhs == __rhs); }
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr bool
- operator<=(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- { return !(__rhs < __lhs); }
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr bool
- operator>(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- { return __rhs < __lhs; }
- template<typename _Rep1, typename _Period1,
- typename _Rep2, typename _Period2>
- constexpr bool
- operator>=(const duration<_Rep1, _Period1>& __lhs,
- const duration<_Rep2, _Period2>& __rhs)
- { return !(__lhs < __rhs); }
- /// nanoseconds
- typedef duration<int64_t, nano> nanoseconds;
- /// microseconds
- typedef duration<int64_t, micro> microseconds;
- /// milliseconds
- typedef duration<int64_t, milli> milliseconds;
- /// seconds
- typedef duration<int64_t> seconds;
- /// minutes
- typedef duration<int64_t, ratio< 60>> minutes;
- /// hours
- typedef duration<int64_t, ratio<3600>> hours;
- /// time_point
- template<typename _Clock, typename _Dur>
- struct time_point
- {
- typedef _Clock clock;
- typedef _Dur duration;
- typedef typename duration::rep rep;
- typedef typename duration::period period;
- constexpr time_point() : __d(duration::zero())
- { }
- constexpr explicit time_point(const duration& __dur)
- : __d(__dur)
- { }
- // conversions
- template<typename _Dur2>
- 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
- {
- _GLIBCXX_BEGIN_NAMESPACE_VERSION
- 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...>(); }
- _GLIBCXX_END_NAMESPACE_VERSION
- } // 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
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