--- /dev/null
+// <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>
+ 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>::lowest(); }
+ };
+
+ 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>
+ 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<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>
+ 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); }
+
+ /// 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_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)));
+ }
+ };
+
+#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
+ /// steady_clock
+ 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;
+ };
+#else
+ typedef system_clock steady_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
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