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//  -*- C++ -*-

// Copyright (C) 2008-2015 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

// .

/** @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 

#else

#include 

#include 

#include 

#include 

#include  // 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>

      struct duration;

    template

      struct time_point;

  _GLIBCXX_END_NAMESPACE_VERSION

  }

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  // 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)

  template

    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> type;

    };

  template

    struct __duration_common_type_wrapper<__failure_type, _Period1, _Period2>

    { typedef __failure_type type; };

  template

    struct common_type,

             chrono::duration<_Rep2, _Period2>>

    : public __duration_common_type_wrapper

             common_type<_Rep1, _Rep2>>::type, _Period1, _Period2>::type

    { };

  // 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)

  template

    struct __timepoint_common_type_wrapper

    {

      typedef __success_type>

        type;

    };

  template

    struct __timepoint_common_type_wrapper<__failure_type, _Clock>

    { typedef __failure_type type; };

  template

    struct common_type,

             chrono::time_point<_Clock, _Duration2>>

    : public __timepoint_common_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

	     bool _NumIsOne = false, bool _DenIsOne = false>

      struct __duration_cast_impl

      {

	template

	  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

      struct __duration_cast_impl<_ToDur, _CF, _CR, true, true>

      {

	template

	  static constexpr _ToDur

	  __cast(const duration<_Rep, _Period>& __d)

	  {

	    typedef typename _ToDur::rep			__to_rep;

	    return _ToDur(static_cast<__to_rep>(__d.count()));

	  }

      };

    template

      struct __duration_cast_impl<_ToDur, _CF, _CR, true, false>

      {

	template

	  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

      struct __duration_cast_impl<_ToDur, _CF, _CR, false, true>

      {

	template

	  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

      struct __is_duration

      : std::false_type

      { };

    template

      struct __is_duration>

      : std::true_type

      { };

    /// duration_cast

    template

      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

      struct treat_as_floating_point

      : is_floating_point<_Rep>

      { };

    /// duration_values

    template

      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

      struct __is_ratio

      : std::false_type

      { };

    template

      struct __is_ratio>

      : std::true_type

      { };

    /// duration

    template

      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

	       enable_if::value

			 && (treat_as_floating_point::value

			     || !treat_as_floating_point<_Rep2>::value)>::type>

	  constexpr explicit duration(const _Rep2& __rep)

	  : __r(static_cast(__rep)) { }

	template

	       enable_if::value

			 || (ratio_divide<_Period2, period>::den == 1

			     && !treat_as_floating_point<_Rep2>::value)>::type>

	  constexpr duration(const duration<_Rep2, _Period2>& __d)

	  : __r(duration_cast(__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 enable_if::value,

			     duration&>::type

	  operator%=(const rep& __rhs)

	  {

	    __r %= __rhs;

	    return *this;

	  }

	template

	  typename enable_if::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::zero()); }

	static constexpr duration

	min()

	{ return duration(duration_values::min()); }

	static constexpr duration

	max()

	{ return duration(duration_values::max()); }

      private:

	rep __r;

      };

    template

	     typename _Rep2, typename _Period2>

      constexpr typename common_type,

				     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 _Rep2, typename _Period2>

      constexpr typename common_type,

				     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

	     is_convertible<_Rep2,

			    typename common_type<_Rep1, _Rep2>::type>::value>

      struct __common_rep_type { };

    template

      struct __common_rep_type<_Rep1, _Rep2, true>

      { typedef typename common_type<_Rep1, _Rep2>::type type; };

    template

      constexpr

      duration::type, _Period>

      operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)

      {

	typedef duration::type, _Period>

	  __cd;

	return __cd(__cd(__d).count() * __s);

      }

    template

      constexpr

      duration::type, _Period>

      operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)

      { return __d * __s; }

    template

      constexpr duration

	enable_if::value, _Rep2>::type>::type, _Period>

      operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s)

      {

	typedef duration::type, _Period>

	  __cd;

	return __cd(__cd(__d).count() / __s);

      }

    template

	     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

      constexpr duration

	enable_if::value, _Rep2>::type>::type, _Period>

      operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s)

      {

	typedef duration::type, _Period>

	  __cd;

	return __cd(__cd(__d).count() % __s);

      }

    template

	     typename _Rep2, typename _Period2>

      constexpr typename common_type,

				     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 _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 _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 _Rep2, typename _Period2>

      constexpr bool

      operator!=(const duration<_Rep1, _Period1>& __lhs,

		 const duration<_Rep2, _Period2>& __rhs)

      { return !(__lhs == __rhs); }

    template

	     typename _Rep2, typename _Period2>

      constexpr bool

      operator<=(const duration<_Rep1, _Period1>& __lhs,

		 const duration<_Rep2, _Period2>& __rhs)

      { return !(__rhs < __lhs); }

    template

	     typename _Rep2, typename _Period2>

      constexpr bool

      operator>(const duration<_Rep1, _Period1>& __lhs,

		const duration<_Rep2, _Period2>& __rhs)

      { return __rhs < __lhs; }

    template

	     typename _Rep2, typename _Period2>

      constexpr bool

      operator>=(const duration<_Rep1, _Period1>& __lhs,

		 const duration<_Rep2, _Period2>& __rhs)

      { return !(__lhs < __rhs); }

    /// nanoseconds

    typedef duration 	    nanoseconds;

    /// microseconds

    typedef duration 	    microseconds;

    /// milliseconds

    typedef duration 	    milliseconds;

    /// seconds

    typedef duration 		    seconds;

    /// minutes

    typedef duration>   minutes;

    /// hours

    typedef duration>  hours;

    /// time_point

    template

      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

	  constexpr time_point(const time_point& __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

      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 _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 _Dur2>

      constexpr time_point<_Clock,

	typename common_type, _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 _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

      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

      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

      constexpr bool

      operator!=(const time_point<_Clock, _Dur1>& __lhs,

		 const time_point<_Clock, _Dur2>& __rhs)

      { return !(__lhs == __rhs); }

    template

      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

      constexpr bool

      operator<=(const time_point<_Clock, _Dur1>& __lhs,

		 const time_point<_Clock, _Dur2>& __rhs)

      { return !(__rhs < __lhs); }

    template

      constexpr bool

      operator>(const time_point<_Clock, _Dur1>& __lhs,

		const time_point<_Clock, _Dur2>& __rhs)

      { return __rhs < __lhs; }

    template

      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 	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

			   (__t.time_since_epoch()).count());

      }

      static time_point

      from_time_t(std::time_t __t) noexcept

      {

	typedef chrono::time_point	__from;

	return time_point_cast

	       (__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 	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

      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

      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>

    operator""h(long double __hours)

    { return chrono::duration>{__hours}; }

    template 

      constexpr chrono::hours

      operator""h()

      { return __check_overflow(); }

    constexpr chrono::duration>

    operator""min(long double __mins)

    { return chrono::duration>{__mins}; }

    template 

      constexpr chrono::minutes

      operator""min()

      { return __check_overflow(); }

    constexpr chrono::duration

    operator""s(long double __secs)

    { return chrono::duration{__secs}; }

    template 

      constexpr chrono::seconds

      operator""s()

      { return __check_overflow(); }

    constexpr chrono::duration

    operator""ms(long double __msecs)

    { return chrono::duration{__msecs}; }

    template 

      constexpr chrono::milliseconds

      operator""ms()

      { return __check_overflow(); }

    constexpr chrono::duration

    operator""us(long double __usecs)

    { return chrono::duration{__usecs}; }

    template 

      constexpr chrono::microseconds

      operator""us()

      { return __check_overflow(); }

    constexpr chrono::duration

    operator""ns(long double __nsecs)

    { return chrono::duration{__nsecs}; }

    template 

      constexpr chrono::nanoseconds

      operator""ns()

      { return __check_overflow(); }

  } // 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