boost/date_time/gregorian/greg_duration.hpp

   1 #ifndef GREG_DURATION_HPP___
   2 #define GREG_DURATION_HPP___
   3
   4 /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
   5  * Use, modification and distribution is subject to the
   6  * Boost Software License, Version 1.0. (See accompanying
   7  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
   8  * Author: Jeff Garland, Bart Garst
   9  * $Date$
  10  */
  11
  12 #include <boost/date_time/date_duration.hpp>
  13 #include <boost/date_time/int_adapter.hpp>
  14 #include <boost/date_time/special_defs.hpp>
  15
  16 namespace boost {
  17 namespace gregorian {
  18
  19   //!An internal date representation that includes infinities, not a date
  20   typedef boost::date_time::duration_traits_adapted date_duration_rep;
  21
  22   //! Durations in days for gregorian system
  23   /*! \ingroup date_basics
  24    */
  25   class date_duration :
  26     public boost::date_time::date_duration< date_duration_rep >
  27   {
  28     typedef boost::date_time::date_duration< date_duration_rep > base_type;
  29
  30   public:
  31     typedef base_type::duration_rep duration_rep;
  32
  33     //! Construct from a day count
  34     explicit date_duration(duration_rep day_count = 0) : base_type(day_count) {}
  35
  36     //! construct from special_values
  37     date_duration(date_time::special_values sv) : base_type(sv) {}
  38
  39     //! Copy constructor
  40     date_duration(const date_duration& other) : base_type(static_cast< base_type const& >(other))
  41     {}
  42
  43     //! Construct from another date_duration
  44     date_duration(const base_type& other) : base_type(other)
  45     {}
  46
  47     //  Relational operators
  48     //  NOTE: Because of date_time::date_duration< T > design choice we don't use Boost.Operators here,
  49     //  because we need the class to be a direct base. Either lose EBO, or define operators by hand.
  50     //  The latter is more effecient.
  51     bool operator== (const date_duration& rhs) const
  52     {
  53       return base_type::operator== (rhs);
  54     }
  55     bool operator!= (const date_duration& rhs) const
  56     {
  57       return !operator== (rhs);
  58     }
  59     bool operator< (const date_duration& rhs) const
  60     {
  61       return base_type::operator< (rhs);
  62     }
  63     bool operator> (const date_duration& rhs) const
  64     {
  65       return !(base_type::operator< (rhs) || base_type::operator== (rhs));
  66     }
  67     bool operator<= (const date_duration& rhs) const
  68     {
  69       return (base_type::operator< (rhs) || base_type::operator== (rhs));
  70     }
  71     bool operator>= (const date_duration& rhs) const
  72     {
  73       return !base_type::operator< (rhs);
  74     }
  75
  76     //! Subtract another duration -- result is signed
  77     date_duration& operator-= (const date_duration& rhs)
  78     {
  79       base_type::operator-= (rhs);
  80       return *this;
  81     }
  82     friend date_duration operator- (date_duration rhs, date_duration const& lhs)
  83     {
  84       rhs -= lhs;
  85       return rhs;
  86     }
  87
  88     //! Add a duration -- result is signed
  89     date_duration& operator+= (const date_duration& rhs)
  90     {
  91       base_type::operator+= (rhs);
  92       return *this;
  93     }
  94     friend date_duration operator+ (date_duration rhs, date_duration const& lhs)
  95     {
  96       rhs += lhs;
  97       return rhs;
  98     }
  99
 100     //! unary- Allows for dd = -date_duration(2); -> dd == -2
 101     date_duration operator- ()const
 102     {
 103       return date_duration(get_rep() * (-1));
 104     }
 105
 106     //! Division operations on a duration with an integer.
 107     date_duration& operator/= (int divisor)
 108     {
 109       base_type::operator/= (divisor);
 110       return *this;
 111     }
 112     friend date_duration operator/ (date_duration rhs, int lhs)
 113     {
 114       rhs /= lhs;
 115       return rhs;
 116     }
 117
 118     //! Returns the smallest duration -- used by to calculate 'end'
 119     static date_duration unit()
 120     {
 121       return date_duration(base_type::unit().get_rep());
 122     }
 123   };
 124
 125   //! Shorthand for date_duration
 126   typedef date_duration days;
 127
 128 } } //namespace gregorian
 129
 130 #if defined(BOOST_DATE_TIME_OPTIONAL_GREGORIAN_TYPES)
 131 #include <boost/date_time/date_duration_types.hpp>
 132 #endif
 133
 134 #endif