Chris@16: #ifndef DATE_TIME_DATE_DURATION__
Chris@16: #define DATE_TIME_DATE_DURATION__
Chris@16: 
Chris@16: /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
Chris@16:  * Use, modification and distribution is subject to the
Chris@16:  * Boost Software License, Version 1.0. (See accompanying
Chris@16:  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  * Author: Jeff Garland, Bart Garst
Chris@101:  * $Date$
Chris@16:  */
Chris@16: 
Chris@16: 
Chris@16: #include <boost/operators.hpp>
Chris@16: #include <boost/date_time/special_defs.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace date_time {
Chris@16: 
Chris@16: 
Chris@16:   //! Duration type with date level resolution
Chris@16:   template<class duration_rep_traits>
Chris@16:   class date_duration : private
Chris@16:               boost::less_than_comparable1< date_duration< duration_rep_traits >
Chris@16:             , boost::equality_comparable1< date_duration< duration_rep_traits >
Chris@16:             , boost::addable1< date_duration< duration_rep_traits >
Chris@16:             , boost::subtractable1< date_duration< duration_rep_traits >
Chris@16:             , boost::dividable2< date_duration< duration_rep_traits >, int
Chris@16:             > > > > >
Chris@16:   {
Chris@16:   public:
Chris@16:     typedef typename duration_rep_traits::int_type duration_rep_type;
Chris@16:     typedef typename duration_rep_traits::impl_type duration_rep;
Chris@16: 
Chris@16:     //! Construct from a day count
Chris@16:     explicit date_duration(duration_rep day_count) : days_(day_count) {}
Chris@16: 
Chris@16:     /*! construct from special_values - only works when
Chris@16:      * instantiated with duration_traits_adapted */
Chris@16:     date_duration(special_values sv) :
Chris@16:             days_(duration_rep::from_special(sv))
Chris@16:     {}
Chris@16: 
Chris@16:     // copy constructor required for addable<> & subtractable<>
Chris@16:     //! Construct from another date_duration (Copy Constructor)
Chris@16:     date_duration(const date_duration<duration_rep_traits>& other) :
Chris@16:             days_(other.days_)
Chris@16:     {}
Chris@16: 
Chris@16:     //! returns days_ as it's instantiated type - used for streaming
Chris@16:     duration_rep get_rep()const
Chris@16:     {
Chris@16:         return days_;
Chris@16:     }
Chris@16:     bool is_special()const
Chris@16:     {
Chris@16:         return days_.is_special();
Chris@16:     }
Chris@16:     //! returns days as value, not object.
Chris@16:     duration_rep_type days() const
Chris@16:     {
Chris@16:         return duration_rep_traits::as_number(days_);
Chris@16:     }
Chris@16:     //! Returns the smallest duration -- used by to calculate 'end'
Chris@16:     static date_duration unit()
Chris@16:     {
Chris@16:         return date_duration<duration_rep_traits>(1);
Chris@16:     }
Chris@16:     //! Equality
Chris@16:     bool operator==(const date_duration& rhs) const
Chris@16:     {
Chris@16:         return days_ == rhs.days_;
Chris@16:     }
Chris@16:     //! Less
Chris@16:     bool operator<(const date_duration& rhs) const
Chris@16:     {
Chris@16:         return days_ < rhs.days_;
Chris@16:     }
Chris@16: 
Chris@16:     /* For shortcut operators (+=, -=, etc) simply using
Chris@16:      * "days_ += days_" may not work. If instantiated with
Chris@16:      * an int_adapter, shortcut operators are not present,
Chris@16:      * so this will not compile */
Chris@16: 
Chris@16:     //! Subtract another duration -- result is signed
Chris@16:     date_duration& operator-=(const date_duration& rhs)
Chris@16:     {
Chris@16:         //days_ -= rhs.days_;
Chris@16:         days_ = days_ - rhs.days_;
Chris@16:         return *this;
Chris@16:     }
Chris@16:     //! Add a duration -- result is signed
Chris@16:     date_duration& operator+=(const date_duration& rhs)
Chris@16:     {
Chris@16:         days_ = days_ + rhs.days_;
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     //! unary- Allows for dd = -date_duration(2); -> dd == -2
Chris@16:     date_duration operator-() const
Chris@16:     {
Chris@16:         return date_duration<duration_rep_traits>(get_rep() * (-1));
Chris@16:     }
Chris@16:     //! Division operations on a duration with an integer.
Chris@16:     date_duration& operator/=(int divisor)
Chris@16:     {
Chris@16:         days_ = days_ / divisor;
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     //! return sign information
Chris@16:     bool is_negative() const
Chris@16:     {
Chris@16:         return days_ < 0;
Chris@16:     }
Chris@16: 
Chris@16:   private:
Chris@16:     duration_rep days_;
Chris@16:   };
Chris@16: 
Chris@16: 
Chris@16:   /*! Struct for instantiating date_duration with <b>NO</b> special values
Chris@16:    * functionality. Allows for transparent implementation of either
Chris@16:    * date_duration<long> or date_duration<int_adapter<long> > */
Chris@16:   struct duration_traits_long
Chris@16:   {
Chris@16:     typedef long int_type;
Chris@16:     typedef long impl_type;
Chris@16:     static int_type as_number(impl_type i) { return i; }
Chris@16:   };
Chris@16: 
Chris@16:   /*! Struct for instantiating date_duration <b>WITH</b> special values
Chris@16:    * functionality. Allows for transparent implementation of either
Chris@16:    * date_duration<long> or date_duration<int_adapter<long> > */
Chris@16:   struct duration_traits_adapted
Chris@16:   {
Chris@16:     typedef long int_type;
Chris@16:     typedef boost::date_time::int_adapter<long> impl_type;
Chris@16:     static int_type as_number(impl_type i) { return i.as_number(); }
Chris@16:   };
Chris@16: 
Chris@16: 
Chris@16: } } //namspace date_time
Chris@16: 
Chris@16: 
Chris@16: #endif
Chris@16: