Chris@16: #ifndef GREG_DURATION_HPP___
Chris@16: #define GREG_DURATION_HPP___
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: #include <boost/date_time/date_duration.hpp>
Chris@16: #include <boost/date_time/int_adapter.hpp>
Chris@16: #include <boost/date_time/special_defs.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace gregorian {
Chris@16: 
Chris@16:   //!An internal date representation that includes infinities, not a date
Chris@16:   typedef boost::date_time::duration_traits_adapted date_duration_rep;
Chris@16: 
Chris@16:   //! Durations in days for gregorian system
Chris@16:   /*! \ingroup date_basics
Chris@16:    */
Chris@16:   class date_duration :
Chris@16:     public boost::date_time::date_duration< date_duration_rep >
Chris@16:   {
Chris@16:     typedef boost::date_time::date_duration< date_duration_rep > base_type;
Chris@16: 
Chris@16:   public:
Chris@16:     typedef base_type::duration_rep duration_rep;
Chris@16: 
Chris@16:     //! Construct from a day count
Chris@16:     explicit date_duration(duration_rep day_count = 0) : base_type(day_count) {}
Chris@16: 
Chris@16:     //! construct from special_values
Chris@16:     date_duration(date_time::special_values sv) : base_type(sv) {}
Chris@16: 
Chris@16:     //! Copy constructor
Chris@16:     date_duration(const date_duration& other) : base_type(static_cast< base_type const& >(other))
Chris@16:     {}
Chris@16: 
Chris@16:     //! Construct from another date_duration
Chris@16:     date_duration(const base_type& other) : base_type(other)
Chris@16:     {}
Chris@16: 
Chris@16:     //  Relational operators
Chris@16:     //  NOTE: Because of date_time::date_duration< T > design choice we don't use Boost.Operators here,
Chris@16:     //  because we need the class to be a direct base. Either lose EBO, or define operators by hand.
Chris@16:     //  The latter is more effecient.
Chris@16:     bool operator== (const date_duration& rhs) const
Chris@16:     {
Chris@16:       return base_type::operator== (rhs);
Chris@16:     }
Chris@16:     bool operator!= (const date_duration& rhs) const
Chris@16:     {
Chris@16:       return !operator== (rhs);
Chris@16:     }
Chris@16:     bool operator< (const date_duration& rhs) const
Chris@16:     {
Chris@16:       return base_type::operator< (rhs);
Chris@16:     }
Chris@16:     bool operator> (const date_duration& rhs) const
Chris@16:     {
Chris@16:       return !(base_type::operator< (rhs) || base_type::operator== (rhs));
Chris@16:     }
Chris@16:     bool operator<= (const date_duration& rhs) const
Chris@16:     {
Chris@16:       return (base_type::operator< (rhs) || base_type::operator== (rhs));
Chris@16:     }
Chris@16:     bool operator>= (const date_duration& rhs) const
Chris@16:     {
Chris@16:       return !base_type::operator< (rhs);
Chris@16:     }
Chris@16: 
Chris@16:     //! Subtract another duration -- result is signed
Chris@16:     date_duration& operator-= (const date_duration& rhs)
Chris@16:     {
Chris@16:       base_type::operator-= (rhs);
Chris@16:       return *this;
Chris@16:     }
Chris@16:     friend date_duration operator- (date_duration rhs, date_duration const& lhs)
Chris@16:     {
Chris@16:       rhs -= lhs;
Chris@16:       return rhs;
Chris@16:     }
Chris@16: 
Chris@16:     //! Add a duration -- result is signed
Chris@16:     date_duration& operator+= (const date_duration& rhs)
Chris@16:     {
Chris@16:       base_type::operator+= (rhs);
Chris@16:       return *this;
Chris@16:     }
Chris@16:     friend date_duration operator+ (date_duration rhs, date_duration const& lhs)
Chris@16:     {
Chris@16:       rhs += lhs;
Chris@16:       return rhs;
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(get_rep() * (-1));
Chris@16:     }
Chris@16: 
Chris@16:     //! Division operations on a duration with an integer.
Chris@16:     date_duration& operator/= (int divisor)
Chris@16:     {
Chris@16:       base_type::operator/= (divisor);
Chris@16:       return *this;
Chris@16:     }
Chris@16:     friend date_duration operator/ (date_duration rhs, int lhs)
Chris@16:     {
Chris@16:       rhs /= lhs;
Chris@16:       return rhs;
Chris@16:     }
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(base_type::unit().get_rep());
Chris@16:     }
Chris@16:   };      
Chris@16: 
Chris@16:   //! Shorthand for date_duration
Chris@16:   typedef date_duration days;
Chris@16: 
Chris@16: } } //namespace gregorian
Chris@16: 
Chris@16: #if defined(BOOST_DATE_TIME_OPTIONAL_GREGORIAN_TYPES)
Chris@16: #include <boost/date_time/date_duration_types.hpp>
Chris@16: #endif
Chris@16: 
Chris@16: #endif