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
date_duration(duration_rep day_count=0)34     explicit date_duration(duration_rep day_count = 0) : base_type(day_count) {}
35 
36     //! construct from special_values
date_duration(date_time::special_values sv)37     date_duration(date_time::special_values sv) : base_type(sv) {}
38 
39     //! Copy constructor
date_duration(const date_duration & other)40     date_duration(const date_duration& other) : base_type(static_cast< base_type const& >(other))
41     {}
42 
43     //! Construct from another date_duration
date_duration(const base_type & other)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.
operator ==(const date_duration & rhs) const51     bool operator== (const date_duration& rhs) const
52     {
53       return base_type::operator== (rhs);
54     }
operator !=(const date_duration & rhs) const55     bool operator!= (const date_duration& rhs) const
56     {
57       return !operator== (rhs);
58     }
operator <(const date_duration & rhs) const59     bool operator< (const date_duration& rhs) const
60     {
61       return base_type::operator< (rhs);
62     }
operator >(const date_duration & rhs) const63     bool operator> (const date_duration& rhs) const
64     {
65       return !(base_type::operator< (rhs) || base_type::operator== (rhs));
66     }
operator <=(const date_duration & rhs) const67     bool operator<= (const date_duration& rhs) const
68     {
69       return (base_type::operator< (rhs) || base_type::operator== (rhs));
70     }
operator >=(const date_duration & rhs) const71     bool operator>= (const date_duration& rhs) const
72     {
73       return !base_type::operator< (rhs);
74     }
75 
76     //! Subtract another duration -- result is signed
operator -=(const date_duration & rhs)77     date_duration& operator-= (const date_duration& rhs)
78     {
79       base_type::operator-= (rhs);
80       return *this;
81     }
operator -(date_duration rhs,date_duration const & lhs)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
operator +=(const date_duration & rhs)89     date_duration& operator+= (const date_duration& rhs)
90     {
91       base_type::operator+= (rhs);
92       return *this;
93     }
operator +(date_duration rhs,date_duration const & lhs)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
operator -() const101     date_duration operator- ()const
102     {
103       return date_duration(get_rep() * (-1));
104     }
105 
106     //! Division operations on a duration with an integer.
operator /=(int divisor)107     date_duration& operator/= (int divisor)
108     {
109       base_type::operator/= (divisor);
110       return *this;
111     }
operator /(date_duration rhs,int lhs)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'
unit()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
135