comparison DEPENDENCIES/generic/include/boost/chrono/duration.hpp @ 16:2665513ce2d3

Add boost headers

+//  duration.hpp  --------------------------------------------------------------//
+
+//  Copyright 2008 Howard Hinnant
+//  Copyright 2008 Beman Dawes
+//  Copyright 2009-2011 Vicente J. Botet Escriba
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+/*
+
+This code was derived by Beman Dawes from Howard Hinnant's time2_demo prototype.
+Many thanks to Howard for making his code available under the Boost license.
+The original code was modified to conform to Boost conventions and to section
+20.9 Time utilities [time] of the C++ committee's working paper N2798.
+See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2798.pdf.
+
+time2_demo contained this comment:
+
+    Much thanks to Andrei Alexandrescu,
+                   Walter Brown,
+                   Peter Dimov,
+                   Jeff Garland,
+                   Terry Golubiewski,
+                   Daniel Krugler,
+                   Anthony Williams.
+*/
+
+
+#ifndef BOOST_CHRONO_DURATION_HPP
+#define BOOST_CHRONO_DURATION_HPP
+
+#include <boost/chrono/config.hpp>
+#include <boost/chrono/detail/static_assert.hpp>
+
+#include <climits>
+#include <limits>
+
+
+#include <boost/mpl/logical.hpp>
+#include <boost/ratio/ratio.hpp>
+#include <boost/type_traits/common_type.hpp>
+#include <boost/type_traits/is_arithmetic.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+#include <boost/type_traits/is_floating_point.hpp>
+#include <boost/type_traits/is_unsigned.hpp>
+#include <boost/chrono/detail/is_evenly_divisible_by.hpp>
+
+#include <boost/cstdint.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/integer_traits.hpp>
+
+#if !defined(BOOST_NO_CXX11_STATIC_ASSERT) || !defined(BOOST_CHRONO_USES_MPL_ASSERT)
+#define BOOST_CHRONO_A_DURATION_REPRESENTATION_CAN_NOT_BE_A_DURATION        "A duration representation can not be a duration"
+#define BOOST_CHRONO_SECOND_TEMPLATE_PARAMETER_OF_DURATION_MUST_BE_A_STD_RATIO "Second template parameter of duration must be a boost::ratio"
+#define BOOST_CHRONO_DURATION_PERIOD_MUST_BE_POSITIVE "duration period must be positive"
+#define BOOST_CHRONO_SECOND_TEMPLATE_PARAMETER_OF_TIME_POINT_MUST_BE_A_BOOST_CHRONO_DURATION "Second template parameter of time_point must be a boost::chrono::duration"
+#endif
+
+#ifndef BOOST_CHRONO_HEADER_ONLY
+// this must occur after all of the includes and before any code appears:
+#include <boost/config/abi_prefix.hpp> // must be the last #include
+#endif
+
+//----------------------------------------------------------------------------//
+//                                                                            //
+//                        20.9 Time utilities [time]                          //
+//                                 synopsis                                   //
+//                                                                            //
+//----------------------------------------------------------------------------//
+
+namespace boost {
+namespace chrono {
+
+    template <class Rep, class Period = ratio<1> >
+    class duration;
+
+    namespace detail
+    {
+    template <class T>
+      struct is_duration
+        : boost::false_type {};
+
+    template <class Rep, class Period>
+      struct is_duration<duration<Rep, Period> >
+        : boost::true_type  {};
+
+    template <class Duration, class Rep, bool = is_duration<Rep>::value>
+    struct duration_divide_result
+    {
+    };
+
+    template <class Duration, class Rep2,
+        bool = (
+                    ((boost::is_convertible<typename Duration::rep,
+                        typename common_type<typename Duration::rep, Rep2>::type>::value))
+                &&  ((boost::is_convertible<Rep2,
+                        typename common_type<typename Duration::rep, Rep2>::type>::value))
+                )
+        >
+    struct duration_divide_imp
+    {
+    };
+
+    template <class Rep1, class Period, class Rep2>
+    struct duration_divide_imp<duration<Rep1, Period>, Rep2, true>
+    {
+        typedef duration<typename common_type<Rep1, Rep2>::type, Period> type;
+    };
+
+    template <class Rep1, class Period, class Rep2>
+    struct duration_divide_result<duration<Rep1, Period>, Rep2, false>
+        : duration_divide_imp<duration<Rep1, Period>, Rep2>
+    {
+    };
+
+///
+    template <class Rep, class Duration, bool = is_duration<Rep>::value>
+    struct duration_divide_result2
+    {
+    };
+
+    template <class Rep, class Duration,
+        bool = (
+                    ((boost::is_convertible<typename Duration::rep,
+                        typename common_type<typename Duration::rep, Rep>::type>::value))
+                &&  ((boost::is_convertible<Rep,
+                        typename common_type<typename Duration::rep, Rep>::type>::value))
+                )
+        >
+    struct duration_divide_imp2
+    {
+    };
+
+    template <class Rep1, class Rep2, class Period >
+    struct duration_divide_imp2<Rep1, duration<Rep2, Period>, true>
+    {
+        //typedef typename common_type<Rep1, Rep2>::type type;
+        typedef double type;
+    };
+
+    template <class Rep1, class Rep2, class Period >
+    struct duration_divide_result2<Rep1, duration<Rep2, Period>, false>
+        : duration_divide_imp2<Rep1, duration<Rep2, Period> >
+    {
+    };
+
+///
+    template <class Duration, class Rep, bool = is_duration<Rep>::value>
+    struct duration_modulo_result
+    {
+    };
+
+    template <class Duration, class Rep2,
+        bool = (
+                    //boost::is_convertible<typename Duration::rep,
+                        //typename common_type<typename Duration::rep, Rep2>::type>::value
+                //&&
+    boost::is_convertible<Rep2,
+                        typename common_type<typename Duration::rep, Rep2>::type>::value
+                )
+        >
+    struct duration_modulo_imp
+    {
+    };
+
+    template <class Rep1, class Period, class Rep2>
+    struct duration_modulo_imp<duration<Rep1, Period>, Rep2, true>
+    {
+        typedef duration<typename common_type<Rep1, Rep2>::type, Period> type;
+    };
+
+    template <class Rep1, class Period, class Rep2>
+    struct duration_modulo_result<duration<Rep1, Period>, Rep2, false>
+        : duration_modulo_imp<duration<Rep1, Period>, Rep2>
+    {
+    };
+
+} // namespace detail
+} // namespace chrono
+
+
+// common_type trait specializations
+
+template <class Rep1, class Period1, class Rep2, class Period2>
+struct common_type<chrono::duration<Rep1, Period1>,
+                     chrono::duration<Rep2, Period2> >;
+
+
+namespace chrono {
+
+    // customization traits
+    template <class Rep> struct treat_as_floating_point;
+    template <class Rep> struct duration_values;
+
+    // convenience typedefs
+    typedef duration<boost::int_least64_t, nano> nanoseconds;    // at least 64 bits needed
+    typedef duration<boost::int_least64_t, micro> microseconds;  // at least 55 bits needed
+    typedef duration<boost::int_least64_t, milli> milliseconds;  // at least 45 bits needed
+    typedef duration<boost::int_least64_t> seconds;              // at least 35 bits needed
+    typedef duration<boost::int_least32_t, ratio< 60> > minutes; // at least 29 bits needed
+    typedef duration<boost::int_least32_t, ratio<3600> > hours;  // at least 23 bits needed
+
+//----------------------------------------------------------------------------//
+//                          duration helpers                                  //
+//----------------------------------------------------------------------------//
+
+namespace detail
+{
+
+    // duration_cast
+
+    // duration_cast is the heart of this whole prototype.  It can convert any
+    //   duration to any other.  It is also (implicitly) used in converting
+    //   time_points.  The conversion is always exact if possible.  And it is
+    //   always as efficient as hand written code.  If different representations
+    //   are involved, care is taken to never require implicit conversions.
+    //   Instead static_cast is used explicitly for every required conversion.
+    //   If there are a mixture of integral and floating point representations,
+    //   the use of common_type ensures that the most logical "intermediate"
+    //   representation is used.
+    template <class FromDuration, class ToDuration,
+              class Period,
+              bool PeriodNumEq1,
+              bool PeriodDenEq1>
+    struct duration_cast_aux;
+
+    // When the two periods are the same, all that is left to do is static_cast from
+    //   the source representation to the target representation (which may be a no-op).
+    //   This conversion is always exact as long as the static_cast from the source
+    //   representation to the destination representation is exact.
+    template <class FromDuration, class ToDuration, class Period>
+    struct duration_cast_aux<FromDuration, ToDuration, Period, true, true>
+    {
+        BOOST_CONSTEXPR ToDuration operator()(const FromDuration& fd) const
+        {
+            return ToDuration(static_cast<typename ToDuration::rep>(fd.count()));
+        }
+    };
+
+    // When the numerator of FromPeriod / ToPeriod is 1, then all we need to do is
+    //   divide by the denominator of FromPeriod / ToPeriod.  The common_type of
+    //   the two representations is used for the intermediate computation before
+    //   static_cast'ing to the destination.
+    //   This conversion is generally not exact because of the division (but could be
+    //   if you get lucky on the run time value of fd.count()).
+    template <class FromDuration, class ToDuration, class Period>
+    struct duration_cast_aux<FromDuration, ToDuration, Period, true, false>
+    {
+        BOOST_CONSTEXPR ToDuration operator()(const FromDuration& fd) const
+        {
+            typedef typename common_type<
+                typename ToDuration::rep,
+                typename FromDuration::rep,
+                boost::intmax_t>::type C;
+            return ToDuration(static_cast<typename ToDuration::rep>(
+                              static_cast<C>(fd.count()) / static_cast<C>(Period::den)));
+        }
+    };
+
+    // When the denominator of FromPeriod / ToPeriod is 1, then all we need to do is
+    //   multiply by the numerator of FromPeriod / ToPeriod.  The common_type of
+    //   the two representations is used for the intermediate computation before
+    //   static_cast'ing to the destination.
+    //   This conversion is always exact as long as the static_cast's involved are exact.
+    template <class FromDuration, class ToDuration, class Period>
+    struct duration_cast_aux<FromDuration, ToDuration, Period, false, true>
+    {
+        BOOST_CONSTEXPR ToDuration operator()(const FromDuration& fd) const
+        {
+            typedef typename common_type<
+              typename ToDuration::rep,
+              typename FromDuration::rep,
+              boost::intmax_t>::type C;
+            return ToDuration(static_cast<typename ToDuration::rep>(
+                              static_cast<C>(fd.count()) * static_cast<C>(Period::num)));
+        }
+    };
+
+    // When neither the numerator or denominator of FromPeriod / ToPeriod is 1, then we need to
+    //   multiply by the numerator and divide by the denominator of FromPeriod / ToPeriod.  The
+    //   common_type of the two representations is used for the intermediate computation before
+    //   static_cast'ing to the destination.
+    //   This conversion is generally not exact because of the division (but could be
+    //   if you get lucky on the run time value of fd.count()).
+    template <class FromDuration, class ToDuration, class Period>
+    struct duration_cast_aux<FromDuration, ToDuration, Period, false, false>
+    {
+        BOOST_CONSTEXPR ToDuration operator()(const FromDuration& fd) const
+        {
+            typedef typename common_type<
+              typename ToDuration::rep,
+              typename FromDuration::rep,
+              boost::intmax_t>::type C;
+            return ToDuration(static_cast<typename ToDuration::rep>(
+               static_cast<C>(fd.count()) * static_cast<C>(Period::num)
+                 / static_cast<C>(Period::den)));
+        }
+    };
+
+    template <class FromDuration, class ToDuration>
+    struct duration_cast {
+        typedef typename ratio_divide<typename FromDuration::period,
+              typename ToDuration::period>::type Period;
+        typedef duration_cast_aux<
+            FromDuration,
+            ToDuration,
+            Period,
+            Period::num == 1,
+            Period::den == 1
+        > Aux;
+        BOOST_CONSTEXPR ToDuration operator()(const FromDuration& fd) const
+        {
+            return Aux()(fd);
+        }
+    };
+
+} // namespace detail
+
+//----------------------------------------------------------------------------//
+//                                                                            //
+//      20.9.2 Time-related traits [time.traits]                              //
+//                                                                            //
+//----------------------------------------------------------------------------//
+//----------------------------------------------------------------------------//
+//      20.9.2.1 treat_as_floating_point [time.traits.is_fp]                        //
+//      Probably should have been treat_as_floating_point. Editor notifed.    //
+//----------------------------------------------------------------------------//
+
+    // Support bidirectional (non-exact) conversions for floating point rep types
+    //   (or user defined rep types which specialize treat_as_floating_point).
+    template <class Rep>
+    struct treat_as_floating_point : boost::is_floating_point<Rep> {};
+
+//----------------------------------------------------------------------------//
+//      20.9.2.2 duration_values [time.traits.duration_values]                //
+//----------------------------------------------------------------------------//
+
+namespace detail {
+    template <class T, bool = is_arithmetic<T>::value>
+    struct chrono_numeric_limits {
+        static BOOST_CHRONO_LIB_CONSTEXPR T lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW {return (std::numeric_limits<T>::min)  ();}
+    };
+
+    template <class T>
+    struct chrono_numeric_limits<T,true> {
+        static BOOST_CHRONO_LIB_CONSTEXPR T lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW {return (std::numeric_limits<T>::min)  ();}
+    };
+
+    template <>
+    struct chrono_numeric_limits<float,true> {
+        static BOOST_CHRONO_LIB_CONSTEXPR float lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW
+        {
+            return -(std::numeric_limits<float>::max) ();
+        }
+    };
+
+    template <>
+    struct chrono_numeric_limits<double,true> {
+        static BOOST_CHRONO_LIB_CONSTEXPR double lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW
+        {
+            return -(std::numeric_limits<double>::max) ();
+        }
+    };
+
+    template <>
+    struct chrono_numeric_limits<long double,true> {
+        static BOOST_CHRONO_LIB_CONSTEXPR long double lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW
+        {
+            return -(std::numeric_limits<long double>::max)();
+        }
+    };
+
+    template <class T>
+    struct numeric_limits : chrono_numeric_limits<typename remove_cv<T>::type>
+    {};
+
+}
+template <class Rep>
+struct duration_values
+{
+    static BOOST_CONSTEXPR Rep zero() {return Rep(0);}
+    static BOOST_CHRONO_LIB_CONSTEXPR Rep max BOOST_PREVENT_MACRO_SUBSTITUTION ()
+    {
+        return (std::numeric_limits<Rep>::max)();
+    }
+
+    static BOOST_CHRONO_LIB_CONSTEXPR Rep min BOOST_PREVENT_MACRO_SUBSTITUTION ()
+    {
+        return detail::numeric_limits<Rep>::lowest();
+    }
+};
+
+}  // namespace chrono
+
+//----------------------------------------------------------------------------//
+//      20.9.2.3 Specializations of common_type [time.traits.specializations] //
+//----------------------------------------------------------------------------//
+
+template <class Rep1, class Period1, class Rep2, class Period2>
+struct common_type<chrono::duration<Rep1, Period1>,
+                   chrono::duration<Rep2, Period2> >
+{
+  typedef chrono::duration<typename common_type<Rep1, Rep2>::type,
+                      typename boost::ratio_gcd<Period1, Period2>::type> type;
+};
+
+
+//----------------------------------------------------------------------------//
+//                                                                            //
+//         20.9.3 Class template duration [time.duration]                     //
+//                                                                            //
+//----------------------------------------------------------------------------//
+
+
+namespace chrono {
+
+    template <class Rep, class Period>
+    class BOOST_SYMBOL_VISIBLE duration
+    {
+    //BOOST_CHRONO_STATIC_ASSERT(boost::is_integral<Rep>::value, BOOST_CHRONO_A_DURATION_REPRESENTATION_MUST_BE_INTEGRAL, ());
+    BOOST_CHRONO_STATIC_ASSERT(!boost::chrono::detail::is_duration<Rep>::value,
+            BOOST_CHRONO_A_DURATION_REPRESENTATION_CAN_NOT_BE_A_DURATION, ());
+    BOOST_CHRONO_STATIC_ASSERT(boost::ratio_detail::is_ratio<typename Period::type>::value,
+            BOOST_CHRONO_SECOND_TEMPLATE_PARAMETER_OF_DURATION_MUST_BE_A_STD_RATIO, ());
+    BOOST_CHRONO_STATIC_ASSERT(Period::num>0,
+            BOOST_CHRONO_DURATION_PERIOD_MUST_BE_POSITIVE, ());
+    public:
+        typedef Rep rep;
+        typedef Period period;
+    private:
+        rep rep_;
+    public:
+
+        BOOST_FORCEINLINE BOOST_CONSTEXPR
+        duration() : rep_(duration_values<rep>::zero()) { }
+        template <class Rep2>
+        BOOST_SYMBOL_VISIBLE BOOST_FORCEINLINE BOOST_CONSTEXPR
+        explicit duration(const Rep2& r
+        , typename boost::enable_if <
+                    mpl::and_ <
+                        boost::is_convertible<Rep2, rep>,
+                        mpl::or_ <
+                            treat_as_floating_point<rep>,
+                            mpl::and_ <
+                                mpl::not_ < treat_as_floating_point<rep> >,
+                                mpl::not_ < treat_as_floating_point<Rep2> >
+                            >
+                        >
+                    >
+                >::type* = 0
+            ) : rep_(r) { }
+        //~duration() {} //= default;
+//        BOOST_CONSTEXPR        duration(const duration& rhs) : rep_(rhs.rep_) {} // = default;
+        duration& operator=(const duration& rhs) // = default;
+        {
+            if (&rhs != this) rep_= rhs.rep_;
+            return *this;
+        }
+
+        // conversions
+        template <class Rep2, class Period2>
+        BOOST_FORCEINLINE BOOST_CONSTEXPR
+        duration(const duration<Rep2, Period2>& d
+        , typename boost::enable_if <
+                    mpl::or_ <
+                        treat_as_floating_point<rep>,
+                        mpl::and_ <
+                            chrono_detail::is_evenly_divisible_by<Period2, period>,
+                            mpl::not_ < treat_as_floating_point<Rep2> >
+                        >
+                    >
+                >::type* = 0
+        )
+            : rep_(chrono::detail::duration_cast<duration<Rep2, Period2>, duration>()(d).count()) {}
+
+        // observer
+
+        BOOST_CONSTEXPR
+        rep count() const {return rep_;}
+
+        // arithmetic
+
+        BOOST_CONSTEXPR
+        duration  operator+() const {return duration(rep_);;}
+        BOOST_CONSTEXPR
+        duration  operator-() const {return duration(-rep_);}
+        duration& operator++()      {++rep_; return *this;}
+        duration  operator++(int)   {return duration(rep_++);}
+        duration& operator--()      {--rep_; return *this;}
+        duration  operator--(int)   {return duration(rep_--);}
+
+        duration& operator+=(const duration& d)
+        {
+            rep_ += d.count(); return *this;
+        }
+        duration& operator-=(const duration& d)
+        {
+            rep_ -= d.count(); return *this;
+        }
+
+        duration& operator*=(const rep& rhs) {rep_ *= rhs; return *this;}
+        duration& operator/=(const rep& rhs) {rep_ /= rhs; return *this;}
+        duration& operator%=(const rep& rhs) {rep_ %= rhs; return *this;}
+        duration& operator%=(const duration& rhs)
+        {
+            rep_ %= rhs.count(); return *this;
+        }
+        // 20.9.3.4 duration special values [time.duration.special]
+
+        static BOOST_CONSTEXPR duration zero()
+        {
+            return duration(duration_values<rep>::zero());
+        }
+        static BOOST_CHRONO_LIB_CONSTEXPR duration min BOOST_PREVENT_MACRO_SUBSTITUTION ()
+        {
+            return duration((duration_values<rep>::min)());
+        }
+        static BOOST_CHRONO_LIB_CONSTEXPR duration max BOOST_PREVENT_MACRO_SUBSTITUTION ()
+        {
+            return duration((duration_values<rep>::max)());
+        }
+    };
+
+//----------------------------------------------------------------------------//
+//      20.9.3.5 duration non-member arithmetic [time.duration.nonmember]     //
+//----------------------------------------------------------------------------//
+
+    // Duration +
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    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 CD;
+      return CD(CD(lhs).count()+CD(rhs).count());
+    }
+
+    // Duration -
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    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 CD;
+      return CD(CD(lhs).count()-CD(rhs).count());
+    }
+
+    // Duration *
+
+    template <class Rep1, class Period, class Rep2>
+    inline BOOST_CONSTEXPR
+    typename boost::enable_if <
+        mpl::and_ <
+        boost::is_convertible<Rep1, typename common_type<Rep1, Rep2>::type>,
+        boost::is_convertible<Rep2, typename common_type<Rep1, Rep2>::type>
+        >,
+        duration<typename common_type<Rep1, Rep2>::type, Period>
+    >::type
+    operator*(const duration<Rep1, Period>& d, const Rep2& s)
+    {
+      typedef typename common_type<Rep1, Rep2>::type CR;
+      typedef duration<CR, Period> CD;
+      return CD(CD(d).count()*static_cast<CR>(s));
+    }
+
+    template <class Rep1, class Period, class Rep2>
+    inline BOOST_CONSTEXPR
+    typename boost::enable_if <
+        mpl::and_ <
+        boost::is_convertible<Rep1, typename common_type<Rep1, Rep2>::type>,
+        boost::is_convertible<Rep2, typename common_type<Rep1, Rep2>::type>
+        >,
+        duration<typename common_type<Rep1, Rep2>::type, Period>
+    >::type
+    operator*(const Rep1& s, const duration<Rep2, Period>& d)
+    {
+        return d * s;
+    }
+
+    // Duration /
+
+    template <class Rep1, class Period, class Rep2>
+    inline BOOST_CONSTEXPR
+    typename boost::disable_if <boost::chrono::detail::is_duration<Rep2>,
+      typename boost::chrono::detail::duration_divide_result<
+        duration<Rep1, Period>, Rep2>::type
+    >::type
+    operator/(const duration<Rep1, Period>& d, const Rep2& s)
+    {
+        typedef typename common_type<Rep1, Rep2>::type CR;
+        typedef duration<CR, Period> CD;
+
+      return CD(CD(d).count()/static_cast<CR>(s));
+    }
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    typename common_type<Rep1, Rep2>::type
+    operator/(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs)
+    {
+        typedef typename common_type<duration<Rep1, Period1>,
+                                   duration<Rep2, Period2> >::type CD;
+        return CD(lhs).count() / CD(rhs).count();
+    }
+
+    #ifdef BOOST_CHRONO_EXTENSIONS
+    template <class Rep1, class Rep2, class Period>
+    inline BOOST_CONSTEXPR
+    typename boost::disable_if <boost::chrono::detail::is_duration<Rep1>,
+      typename boost::chrono::detail::duration_divide_result2<
+        Rep1, duration<Rep2, Period> >::type
+      >::type
+    operator/(const Rep1& s, const duration<Rep2, Period>& d)
+    {
+        typedef typename common_type<Rep1, Rep2>::type CR;
+        typedef duration<CR, Period> CD;
+
+      return static_cast<CR>(s)/CD(d).count();
+    }
+    #endif
+    // Duration %
+
+    template <class Rep1, class Period, class Rep2>
+    inline BOOST_CONSTEXPR
+    typename boost::disable_if <boost::chrono::detail::is_duration<Rep2>,
+      typename boost::chrono::detail::duration_modulo_result<
+        duration<Rep1, Period>, Rep2>::type
+    >::type
+    operator%(const duration<Rep1, Period>& d, const Rep2& s)
+    {
+        typedef typename common_type<Rep1, Rep2>::type CR;
+        typedef duration<CR, Period> CD;
+
+      return CD(CD(d).count()%static_cast<CR>(s));
+    }
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    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 CD;
+
+      return CD(CD(lhs).count()%CD(rhs).count());
+    }
+
+
+//----------------------------------------------------------------------------//
+//      20.9.3.6 duration comparisons [time.duration.comparisons]             //
+//----------------------------------------------------------------------------//
+
+namespace detail
+{
+    template <class LhsDuration, class RhsDuration>
+    struct duration_eq
+    {
+      BOOST_CONSTEXPR bool operator()(const LhsDuration& lhs, const RhsDuration& rhs) const
+        {
+            typedef typename common_type<LhsDuration, RhsDuration>::type CD;
+            return CD(lhs).count() == CD(rhs).count();
+        }
+    };
+
+    template <class LhsDuration>
+    struct duration_eq<LhsDuration, LhsDuration>
+    {
+      BOOST_CONSTEXPR bool operator()(const LhsDuration& lhs, const LhsDuration& rhs) const
+        {
+            return lhs.count() == rhs.count();
+        }
+    };
+
+    template <class LhsDuration, class RhsDuration>
+    struct duration_lt
+    {
+      BOOST_CONSTEXPR bool operator()(const LhsDuration& lhs, const RhsDuration& rhs) const
+        {
+            typedef typename common_type<LhsDuration, RhsDuration>::type CD;
+            return CD(lhs).count() < CD(rhs).count();
+        }
+    };
+
+    template <class LhsDuration>
+    struct duration_lt<LhsDuration, LhsDuration>
+    {
+      BOOST_CONSTEXPR bool operator()(const LhsDuration& lhs, const LhsDuration& rhs) const
+        {
+            return lhs.count() < rhs.count();
+        }
+    };
+
+} // namespace detail
+
+    // Duration ==
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    bool
+    operator==(const duration<Rep1, Period1>& lhs,
+          const duration<Rep2, Period2>& rhs)
+    {
+        return boost::chrono::detail::duration_eq<
+            duration<Rep1, Period1>, duration<Rep2, Period2> >()(lhs, rhs);
+    }
+
+    // Duration !=
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    bool
+    operator!=(const duration<Rep1, Period1>& lhs,
+          const duration<Rep2, Period2>& rhs)
+    {
+        return !(lhs == rhs);
+    }
+
+    // Duration <
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    bool
+    operator< (const duration<Rep1, Period1>& lhs,
+          const duration<Rep2, Period2>& rhs)
+    {
+        return boost::chrono::detail::duration_lt<
+          duration<Rep1, Period1>, duration<Rep2, Period2> >()(lhs, rhs);
+    }
+
+    // Duration >
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    bool
+    operator> (const duration<Rep1, Period1>& lhs,
+          const duration<Rep2, Period2>& rhs)
+    {
+        return rhs < lhs;
+    }
+
+    // Duration <=
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    bool
+    operator<=(const duration<Rep1, Period1>& lhs,
+          const duration<Rep2, Period2>& rhs)
+    {
+        return !(rhs < lhs);
+    }
+
+    // Duration >=
+
+    template <class Rep1, class Period1, class Rep2, class Period2>
+    inline BOOST_CONSTEXPR
+    bool
+    operator>=(const duration<Rep1, Period1>& lhs,
+          const duration<Rep2, Period2>& rhs)
+    {
+        return !(lhs < rhs);
+    }
+
+//----------------------------------------------------------------------------//
+//      20.9.3.7 duration_cast [time.duration.cast]                           //
+//----------------------------------------------------------------------------//
+
+    // Compile-time select the most efficient algorithm for the conversion...
+    template <class ToDuration, class Rep, class Period>
+    inline BOOST_CONSTEXPR
+    typename boost::enable_if <
+      boost::chrono::detail::is_duration<ToDuration>, ToDuration>::type
+    duration_cast(const duration<Rep, Period>& fd)
+    {
+        return boost::chrono::detail::duration_cast<
+          duration<Rep, Period>, ToDuration>()(fd);
+    }
+
+} // namespace chrono
+} // namespace boost
+
+#ifndef BOOST_CHRONO_HEADER_ONLY
+// the suffix header occurs after all of our code:
+#include <boost/config/abi_suffix.hpp> // pops abi_prefix.hpp pragmas
+#endif
+
+#endif // BOOST_CHRONO_DURATION_HPP