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1 files changed, 723 insertions, 0 deletions

diff --git a/libstdc++-v3/include/std/chrono b/libstdc++-v3/include/std/chrono
new file mode 100644
index 000000000..89ded2c80
--- /dev/null
+++ b/libstdc++-v3/include/std/chrono
@@ -0,0 +1,723 @@
+// <chrono> -*- C++ -*-
+
+// Copyright (C) 2008, 2009, 2010, 2011 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 <bits/c++0x_warning.h>
+#else
+
+#include <ratio>
+#include <type_traits>
+#include <limits>
+#include <ctime>
+
+#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++ 0x 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
+  // 20.8.2.3 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>>
+    {
+    private:
+      typedef __static_gcd<_Period1::num, _Period2::num> 	__gcd_num;
+      typedef __static_gcd<_Period1::den, _Period2::den> 	__gcd_den;
+      typedef typename common_type<_Rep1, _Rep2>::type		__cr;
+      typedef ratio<__gcd_num::value,
+		    (_Period1::den / __gcd_den::value) * _Period2::den> __r;
+
+    public:
+      typedef chrono::duration<__cr, __r> 			type;
+    };
+
+  // 20.8.2.3 specialization of common_type (for time_point)
+  template<typename _Clock, typename _Dur1, typename _Dur2>
+    struct common_type<chrono::time_point<_Clock, _Dur1>,
+		       chrono::time_point<_Clock, _Dur2>>
+    {
+    private:
+      typedef typename common_type<_Dur1, _Dur2>::type 		__ct;
+
+    public:
+      typedef chrono::time_point<_Clock, __ct> 			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>
+      inline 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> 		__r_div;
+	typedef typename __r_div::type 				__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>::min(); }
+      };
+
+    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
+      {
+	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");
+
+	// 20.8.3.1 construction / copy / destroy
+	constexpr duration() : __r() { }
+
+	constexpr 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>::type::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;
+
+	// 20.8.3.2 observer
+	constexpr rep
+	count() const
+	{ return __r; }
+
+	// 20.8.3.3 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;
+	  }
+
+	// 20.8.3.4 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>
+      inline 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	__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 duration<_Rep1, _Period1>			__dur1;
+	typedef duration<_Rep2, _Period2>			__dur2;
+	typedef typename common_type<__dur1,__dur2>::type	__ct;
+	return __ct(__lhs) -= __rhs;
+      }
+
+    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>
+      inline duration<typename __common_rep_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_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>
+      inline 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 typename common_type<_Rep1, _Rep2>::type 	__cr;
+	return duration<__cr, _Period>(__d) /= __s;
+      }
+
+     template<typename _Rep1, typename _Period1,
+	      typename _Rep2, typename _Period2>
+      inline 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	__ct;
+	return __ct(__lhs).count() / __ct(__rhs).count();
+      }
+
+    // DR 934.
+    template<typename _Rep1, typename _Period, typename _Rep2>
+      inline 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 typename common_type<_Rep1, _Rep2>::type 	__cr;
+	return duration<__cr, _Period>(__d) %= __s;
+      }
+
+     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 duration<_Rep1, _Period1>			__dur1;
+	typedef duration<_Rep2, _Period2>			__dur2;
+	typedef typename common_type<__dur1,__dur2>::type	__ct;
+	return __ct(__lhs) %= __rhs;
+      }
+
+    // comparisons
+    template<typename _Rep1, typename _Period1,
+	     typename _Rep2, typename _Period2>
+      inline 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>
+      inline 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>
+      inline 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>
+      inline 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>
+      inline 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>
+      inline 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<int, ratio< 60>> 	minutes;
+
+    /// hours
+    typedef duration<int, 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>
+      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;
+
+  _GLIBCXX_END_NAMESPACE_VERSION
+  } // namespace chrono
+
+  // @} group chrono
+} // namespace
+
+#endif //_GLIBCXX_USE_C99_STDINT_TR1
+
+#endif //__GXX_EXPERIMENTAL_CXX0X__
+
+#endif //_GLIBCXX_CHRONO