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1 | #ifndef DATE_TIME_DATE_DURATION__ |
2 | #define DATE_TIME_DATE_DURATION__ | |
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 | ||
13 | #include <boost/operators.hpp> | |
14 | #include <boost/date_time/special_defs.hpp> | |
15 | ||
16 | namespace boost { | |
17 | namespace date_time { | |
18 | ||
19 | ||
20 | //! Duration type with date level resolution | |
21 | template<class duration_rep_traits> | |
22 | class date_duration : private | |
23 | boost::less_than_comparable1< date_duration< duration_rep_traits > | |
24 | , boost::equality_comparable1< date_duration< duration_rep_traits > | |
25 | , boost::addable1< date_duration< duration_rep_traits > | |
26 | , boost::subtractable1< date_duration< duration_rep_traits > | |
27 | , boost::dividable2< date_duration< duration_rep_traits >, int | |
28 | > > > > > | |
29 | { | |
30 | public: | |
31 | typedef typename duration_rep_traits::int_type duration_rep_type; | |
32 | typedef typename duration_rep_traits::impl_type duration_rep; | |
33 | ||
34 | //! Construct from a day count | |
35 | explicit date_duration(duration_rep day_count) : days_(day_count) {} | |
36 | ||
37 | /*! construct from special_values - only works when | |
38 | * instantiated with duration_traits_adapted */ | |
39 | date_duration(special_values sv) : | |
40 | days_(duration_rep::from_special(sv)) | |
41 | {} | |
42 | ||
43 | // copy constructor required for addable<> & subtractable<> | |
44 | //! Construct from another date_duration (Copy Constructor) | |
45 | date_duration(const date_duration<duration_rep_traits>& other) : | |
46 | days_(other.days_) | |
47 | {} | |
48 | ||
49 | //! returns days_ as it's instantiated type - used for streaming | |
50 | duration_rep get_rep()const | |
51 | { | |
52 | return days_; | |
53 | } | |
54 | bool is_special()const | |
55 | { | |
56 | return days_.is_special(); | |
57 | } | |
58 | //! returns days as value, not object. | |
59 | duration_rep_type days() const | |
60 | { | |
61 | return duration_rep_traits::as_number(days_); | |
62 | } | |
63 | //! Returns the smallest duration -- used by to calculate 'end' | |
64 | static date_duration unit() | |
65 | { | |
66 | return date_duration<duration_rep_traits>(1); | |
67 | } | |
68 | //! Equality | |
69 | bool operator==(const date_duration& rhs) const | |
70 | { | |
71 | return days_ == rhs.days_; | |
72 | } | |
73 | //! Less | |
74 | bool operator<(const date_duration& rhs) const | |
75 | { | |
76 | return days_ < rhs.days_; | |
77 | } | |
78 | ||
79 | /* For shortcut operators (+=, -=, etc) simply using | |
80 | * "days_ += days_" may not work. If instantiated with | |
81 | * an int_adapter, shortcut operators are not present, | |
82 | * so this will not compile */ | |
83 | ||
84 | //! Subtract another duration -- result is signed | |
85 | date_duration& operator-=(const date_duration& rhs) | |
86 | { | |
87 | //days_ -= rhs.days_; | |
88 | days_ = days_ - rhs.days_; | |
89 | return *this; | |
90 | } | |
91 | //! Add a duration -- result is signed | |
92 | date_duration& operator+=(const date_duration& rhs) | |
93 | { | |
94 | days_ = days_ + rhs.days_; | |
95 | return *this; | |
96 | } | |
97 | ||
98 | //! unary- Allows for dd = -date_duration(2); -> dd == -2 | |
99 | date_duration operator-() const | |
100 | { | |
101 | return date_duration<duration_rep_traits>(get_rep() * (-1)); | |
102 | } | |
103 | //! Division operations on a duration with an integer. | |
104 | date_duration& operator/=(int divisor) | |
105 | { | |
106 | days_ = days_ / divisor; | |
107 | return *this; | |
108 | } | |
109 | ||
110 | //! return sign information | |
111 | bool is_negative() const | |
112 | { | |
113 | return days_ < 0; | |
114 | } | |
115 | ||
116 | private: | |
117 | duration_rep days_; | |
118 | }; | |
119 | ||
120 | ||
121 | /*! Struct for instantiating date_duration with <b>NO</b> special values | |
122 | * functionality. Allows for transparent implementation of either | |
123 | * date_duration<long> or date_duration<int_adapter<long> > */ | |
124 | struct duration_traits_long | |
125 | { | |
126 | typedef long int_type; | |
127 | typedef long impl_type; | |
128 | static int_type as_number(impl_type i) { return i; } | |
129 | }; | |
130 | ||
131 | /*! Struct for instantiating date_duration <b>WITH</b> special values | |
132 | * functionality. Allows for transparent implementation of either | |
133 | * date_duration<long> or date_duration<int_adapter<long> > */ | |
134 | struct duration_traits_adapted | |
135 | { | |
136 | typedef long int_type; | |
137 | typedef boost::date_time::int_adapter<long> impl_type; | |
138 | static int_type as_number(impl_type i) { return i.as_number(); } | |
139 | }; | |
140 | ||
141 | ||
142 | } } //namspace date_time | |
143 | ||
144 | ||
145 | #endif | |
146 |