// <chrono> -*- C++ -*-
// Copyright (C) 2008, 2009 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
#ifndef __GXX_EXPERIMENTAL_CXX0X__
# include <c++0x_warning.h>
#else
#ifdef _GLIBCXX_INCLUDE_AS_TR1
# error C++0x header cannot be included from TR1 header
#endif
#include <ratio>
#include <type_traits>
#include <limits>
#include <ctime>
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
namespace std
{
/**
* @defgroup chrono Time
* @ingroup utilities
*
* Classes and functions for time.
* @{
*/
/** @namespace std::chrono
* @brief ISO C++ 0x entities sub namespace for time and date.
*/
namespace chrono
{
template<typename _Rep, typename _Period = ratio<1>>
struct duration;
template<typename _Clock, typename _Duration = typename _Clock::duration>
struct time_point;
}
// 20.8.2.3 specialization of common_type (for duration)
template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
struct common_type<chrono::duration<_Rep1, _Period1>,
chrono::duration<_Rep2, _Period2>>
{
typedef chrono::duration<typename common_type<_Rep1, _Rep2>::type,
ratio<__static_gcd<_Period1::num, _Period2::num>::value,
(_Period1::den / __static_gcd<_Period1::den, _Period2::den>::value)
* _Period2::den>> type;
};
// 20.8.2.3 specialization of common_type (for time_point)
template<typename _Clock, typename _Duration1, typename _Duration2>
struct common_type<chrono::time_point<_Clock, _Duration1>,
chrono::time_point<_Clock, _Duration2>>
{
typedef chrono::time_point<_Clock,
typename common_type<_Duration1, _Duration2>::type> type;
};
namespace chrono
{
// Primary template for duration_cast impl.
template<typename _ToDuration, typename _CF, typename _CR,
bool _NumIsOne = false, bool _DenIsOne = false>
struct __duration_cast_impl
{
template<typename _Rep, typename _Period>
static _ToDuration __cast(const duration<_Rep, _Period>& __d)
{
return _ToDuration(static_cast<
typename _ToDuration::rep>(static_cast<_CR>(__d.count())
* static_cast<_CR>(_CF::num)
/ static_cast<_CR>(_CF::den)));
}
};
template<typename _ToDuration, typename _CF, typename _CR>
struct __duration_cast_impl<_ToDuration, _CF, _CR, true, true>
{
template<typename _Rep, typename _Period>
static _ToDuration __cast(const duration<_Rep, _Period>& __d)
{
return _ToDuration(
static_cast<typename _ToDuration::rep>(__d.count()));
}
};
template<typename _ToDuration, typename _CF, typename _CR>
struct __duration_cast_impl<_ToDuration, _CF, _CR, true, false>
{
template<typename _Rep, typename _Period>
static _ToDuration __cast(const duration<_Rep, _Period>& __d)
{
return _ToDuration(static_cast<typename _ToDuration::rep>(
static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den)));
}
};
template<typename _ToDuration, typename _CF, typename _CR>
struct __duration_cast_impl<_ToDuration, _CF, _CR, false, true>
{
template<typename _Rep, typename _Period>
static _ToDuration __cast(const duration<_Rep, _Period>& __d)
{
return _ToDuration(static_cast<typename _ToDuration::rep>(
static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
}
};
/// duration_cast
template<typename _ToDuration, typename _Rep, typename _Period>
inline _ToDuration
duration_cast(const duration<_Rep, _Period>& __d)
{
typedef typename
ratio_divide<_Period, typename _ToDuration::period>::type __cf;
typedef typename
common_type<typename _ToDuration::rep, _Rep, intmax_t>::type __cr;
return __duration_cast_impl<_ToDuration, __cf, __cr,
__cf::num == 1, __cf::den == 1>::__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 const _Rep
zero()
{ return _Rep(0); }
static const _Rep
max()
{ return numeric_limits<_Rep>::max(); }
static const _Rep
min()
{ return numeric_limits<_Rep>::min(); }
};
template<typename _Tp>
struct __is_duration
: std::false_type
{ };
template<typename _Rep, typename _Period>
struct __is_duration<duration<_Rep, _Period>>
: std::true_type
{ };
template<typename T>
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
{
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");
typedef _Rep rep;
typedef _Period period;
// 20.8.3.1 construction / copy / destroy
duration() = default;
template<typename _Rep2>
explicit duration(_Rep2 const& __rep)
: __r(static_cast<rep>(__rep))
{
static_assert(is_convertible<_Rep2,rep>::value
&& (treat_as_floating_point<rep>::value
|| !treat_as_floating_point<_Rep2>::value),
"cannot construct integral duration with floating point type");
}
template<typename _Rep2, typename _Period2>
duration(const duration<_Rep2, _Period2>& __d)
: __r(duration_cast<duration>(__d).count())
{
static_assert(treat_as_floating_point<rep>::value == true
|| ratio_divide<_Period2, period>::type::den == 1,
"the resulting duration is not exactly representable");
}
~duration() = default;
duration(const duration&) = default;
duration& operator=(const duration&) = default;
// 20.8.3.2 observer
rep
count() const
{ return __r; }
// 20.8.3.3 arithmetic
duration
operator+() const
{ return *this; }
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;
}
// 20.8.3.4 special values
// TODO: These should be constexprs.
static const duration
zero()
{ return duration(duration_values<rep>::zero()); }
static const duration
min()
{ return duration(duration_values<rep>::min()); }
static const duration
max()
{ return duration(duration_values<rep>::max()); }
private:
rep __r;
};
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
inline typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type
operator+(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type __ct;
return __ct(__lhs) += __rhs;
}
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
inline typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type
operator-(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type __ct;
return __ct(__lhs) -= __rhs;
}
template<typename _Rep1, typename _Period, typename _Rep2>
inline duration<typename common_type<_Rep1, _Rep2>::type, _Period>
operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
{
typedef typename common_type<_Rep1, _Rep2>::type __cr;
return duration<__cr, _Period>(__d) *= __s;
}
template<typename _Rep1, typename _Period, typename _Rep2>
inline duration<typename common_type<_Rep1, _Rep2>::type, _Period>
operator*(const _Rep2& __s, const duration<_Rep1, _Period>& __d)
{ return __d * __s; }
template<typename _Tp, typename _Up, typename _Ep = void>
struct __division_impl;
template<typename _Rep1, typename _Period, typename _Rep2>
struct __division_impl<duration<_Rep1, _Period>, _Rep2,
typename enable_if<!__is_duration<_Rep2>::value>::type>
{
typedef typename common_type<_Rep1, _Rep2>::type __cr;
typedef
duration<typename common_type<_Rep1, _Rep2>::type, _Period> __rt;
static __rt
__divide(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
{ return duration<__cr, _Period>(__d) /= __s; }
};
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
struct __division_impl<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>
{
typedef typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type __ct;
typedef typename common_type<_Rep1, _Rep2>::type __rt;
static __rt
__divide(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return __ct(__lhs).count() / __ct(__rhs).count(); }
};
template<typename _Rep, typename _Period, typename _Up>
inline typename __division_impl<duration<_Rep, _Period>, _Up>::__rt
operator/(const duration<_Rep, _Period>& __d, const _Up& __u)
{
return
__division_impl<duration<_Rep, _Period>, _Up>::__divide(__d, __u);
}
// comparisons
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
inline bool
operator==(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type __ct;
return __ct(__lhs).count() == __ct(__rhs).count();
}
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
inline bool
operator<(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type __ct;
return __ct(__lhs).count() < __ct(__rhs).count();
}
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
inline bool
operator!=(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return !(__lhs == __rhs); }
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
inline bool
operator<=(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return !(__rhs < __lhs); }
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
inline bool
operator>(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return __rhs < __lhs; }
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
inline 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<int, ratio< 60>> minutes;
/// hours
typedef duration<int, ratio<3600>> hours;
/// time_point
template<typename _Clock, typename _Duration>
struct time_point
{
typedef _Clock clock;
typedef _Duration duration;
typedef typename duration::rep rep;
typedef typename duration::period period;
time_point() : __d(duration::zero())
{ }
explicit time_point(const duration& __dur)
: __d(duration::zero() + __dur)
{ }
// conversions
template<typename _Duration2>
time_point(const time_point<clock, _Duration2>& __t)
: __d(__t.time_since_epoch())
{ }
// observer
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
// TODO: These should be constexprs.
static const time_point
min()
{ return time_point(duration::min()); }
static const time_point
max()
{ return time_point(duration::max()); }
private:
duration __d;
};
/// time_point_cast
template<typename _ToDuration, typename _Clock, typename _Duration>
inline time_point<_Clock, _ToDuration>
time_point_cast(const time_point<_Clock, _Duration>& __t)
{
return time_point<_Clock, _ToDuration>(
duration_cast<_ToDuration>(__t.time_since_epoch()));
}
template<typename _Clock, typename _Duration1,
typename _Rep2, typename _Period2>
inline time_point<_Clock,
typename common_type<_Duration1, duration<_Rep2, _Period2>>::type>
operator+(const time_point<_Clock, _Duration1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef time_point<_Clock,
typename common_type<_Duration1,
duration<_Rep2, _Period2>>::type> __ct;
return __ct(__lhs) += __rhs;
}
template<typename _Rep1, typename _Period1,
typename _Clock, typename _Duration2>
inline time_point<_Clock,
typename common_type<duration<_Rep1, _Period1>, _Duration2>::type>
operator+(const duration<_Rep1, _Period1>& __lhs,
const time_point<_Clock, _Duration2>& __rhs)
{ return __rhs + __lhs; }
template<typename _Clock, typename _Duration1,
typename _Rep2, typename _Period2>
inline time_point<_Clock,
typename common_type<_Duration1, duration<_Rep2, _Period2>>::type>
operator-(const time_point<_Clock, _Duration1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return __lhs + (-__rhs); }
template<typename _Clock, typename _Duration1, typename _Duration2>
inline typename common_type<_Duration1, _Duration2>::type
operator-(const time_point<_Clock, _Duration1>& __lhs,
const time_point<_Clock, _Duration2>& __rhs)
{ return __lhs.time_since_epoch() - __rhs.time_since_epoch(); }
template<typename _Clock, typename _Duration1, typename _Duration2>
inline bool
operator==(const time_point<_Clock, _Duration1>& __lhs,
const time_point<_Clock, _Duration2>& __rhs)
{ return __lhs.time_since_epoch() == __rhs.time_since_epoch(); }
template<typename _Clock, typename _Duration1, typename _Duration2>
inline bool
operator!=(const time_point<_Clock, _Duration1>& __lhs,
const time_point<_Clock, _Duration2>& __rhs)
{ return !(__lhs == __rhs); }
template<typename _Clock, typename _Duration1, typename _Duration2>
inline bool
operator<(const time_point<_Clock, _Duration1>& __lhs,
const time_point<_Clock, _Duration2>& __rhs)
{ return __lhs.time_since_epoch() < __rhs.time_since_epoch(); }
template<typename _Clock, typename _Duration1, typename _Duration2>
inline bool
operator<=(const time_point<_Clock, _Duration1>& __lhs,
const time_point<_Clock, _Duration2>& __rhs)
{ return !(__rhs < __lhs); }
template<typename _Clock, typename _Duration1, typename _Duration2>
inline bool
operator>(const time_point<_Clock, _Duration1>& __lhs,
const time_point<_Clock, _Duration2>& __rhs)
{ return __rhs < __lhs; }
template<typename _Clock, typename _Duration1, typename _Duration2>
inline bool
operator>=(const time_point<_Clock, _Duration1>& __lhs,
const time_point<_Clock, _Duration2>& __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 const bool is_monotonic = false;
static time_point
now();
// 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)
{
return time_point_cast<system_clock::duration>(
chrono::time_point<system_clock, chrono::seconds>(
chrono::seconds(__t)));
}
// TODO: requires constexpr
/*
static_assert(
system_clock::duration::min() <
system_clock::duration::zero(),
"a clock's minimum duration cannot be less than its epoch");
*/
};
#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 const 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
} // namespace std
#endif //_GLIBCXX_USE_C99_STDINT_TR1
#endif //__GXX_EXPERIMENTAL_CXX0X__
#endif //_GLIBCXX_CHRONO