1 | #ifndef _DATE_TIME_ADJUST_FUNCTORS_HPP___ |
2 | #define _DATE_TIME_ADJUST_FUNCTORS_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.hpp" |
13 | #include "boost/date_time/wrapping_int.hpp" |
14 | |
15 | namespace boost { |
16 | namespace date_time { |
17 | |
18 | |
19 | //! Functor to iterate a fixed number of days |
20 | template<class date_type> |
21 | class day_functor |
22 | { |
23 | public: |
24 | typedef typename date_type::duration_type duration_type; |
25 | day_functor(int f) : f_(f) {} |
26 | duration_type get_offset(const date_type& d) const |
27 | { |
28 | // why is 'd' a parameter??? |
29 | // fix compiler warnings |
30 | d.year(); |
31 | return duration_type(f_); |
32 | } |
33 | duration_type get_neg_offset(const date_type& d) const |
34 | { |
35 | // fix compiler warnings |
36 | d.year(); |
37 | return duration_type(-f_); |
38 | } |
39 | private: |
40 | int f_; |
41 | }; |
42 | |
43 | |
44 | //! Provides calculation to find next nth month given a date |
45 | /*! This adjustment function provides the logic for 'month-based' |
46 | * advancement on a ymd based calendar. The policy it uses |
47 | * to handle the non existant end of month days is to back |
48 | * up to the last day of the month. Also, if the starting |
49 | * date is the last day of a month, this functor will attempt |
50 | * to adjust to the end of the month. |
51 | |
52 | */ |
53 | template<class date_type> |
54 | class month_functor |
55 | { |
56 | public: |
57 | typedef typename date_type::duration_type duration_type; |
58 | typedef typename date_type::calendar_type cal_type; |
59 | typedef typename cal_type::ymd_type ymd_type; |
60 | typedef typename cal_type::day_type day_type; |
61 | |
62 | month_functor(int f) : f_(f), origDayOfMonth_(0) {} |
63 | duration_type get_offset(const date_type& d) const |
64 | { |
65 | ymd_type ymd(d.year_month_day()); |
66 | if (origDayOfMonth_ == 0) { |
67 | origDayOfMonth_ = ymd.day; |
68 | day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month)); |
69 | if (endOfMonthDay == ymd.day) { |
70 | origDayOfMonth_ = -1; //force the value to the end of month |
71 | } |
72 | } |
73 | typedef date_time::wrapping_int2<short,1,12> wrap_int2; |
74 | typedef typename wrap_int2::int_type int_type; |
75 | wrap_int2 wi(ymd.month); |
76 | //calc the year wrap around, add() returns 0 or 1 if wrapped |
77 | int_type year = wi.add(v: static_cast<int_type>(f_)); |
78 | year = static_cast<int_type>(year + ymd.year); //calculate resulting year |
79 | // std::cout << "trace wi: " << wi.as_int() << std::endl; |
80 | // std::cout << "trace year: " << year << std::endl; |
81 | //find the last day for the new month |
82 | day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int())); |
83 | //original was the end of month -- force to last day of month |
84 | if (origDayOfMonth_ == -1) { |
85 | return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d; |
86 | } |
87 | day_type dayOfMonth = origDayOfMonth_; |
88 | if (dayOfMonth > resultingEndOfMonthDay) { |
89 | dayOfMonth = resultingEndOfMonthDay; |
90 | } |
91 | return date_type(year, wi.as_int(), dayOfMonth) - d; |
92 | } |
93 | //! Returns a negative duration_type |
94 | duration_type get_neg_offset(const date_type& d) const |
95 | { |
96 | ymd_type ymd(d.year_month_day()); |
97 | if (origDayOfMonth_ == 0) { |
98 | origDayOfMonth_ = ymd.day; |
99 | day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month)); |
100 | if (endOfMonthDay == ymd.day) { |
101 | origDayOfMonth_ = -1; //force the value to the end of month |
102 | } |
103 | } |
104 | typedef date_time::wrapping_int2<short,1,12> wrap_int2; |
105 | typedef typename wrap_int2::int_type int_type; |
106 | wrap_int2 wi(ymd.month); |
107 | //calc the year wrap around, add() returns 0 or 1 if wrapped |
108 | int_type year = wi.subtract(v: static_cast<int_type>(f_)); |
109 | year = static_cast<int_type>(year + ymd.year); //calculate resulting year |
110 | //find the last day for the new month |
111 | day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int())); |
112 | //original was the end of month -- force to last day of month |
113 | if (origDayOfMonth_ == -1) { |
114 | return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d; |
115 | } |
116 | day_type dayOfMonth = origDayOfMonth_; |
117 | if (dayOfMonth > resultingEndOfMonthDay) { |
118 | dayOfMonth = resultingEndOfMonthDay; |
119 | } |
120 | return date_type(year, wi.as_int(), dayOfMonth) - d; |
121 | } |
122 | private: |
123 | int f_; |
124 | mutable short origDayOfMonth_; |
125 | }; |
126 | |
127 | |
128 | //! Functor to iterate a over weeks |
129 | template<class date_type> |
130 | class week_functor |
131 | { |
132 | public: |
133 | typedef typename date_type::duration_type duration_type; |
134 | typedef typename date_type::calendar_type calendar_type; |
135 | week_functor(int f) : f_(f) {} |
136 | duration_type get_offset(const date_type& d) const |
137 | { |
138 | // why is 'd' a parameter??? |
139 | // fix compiler warnings |
140 | d.year(); |
141 | return duration_type(f_*calendar_type::days_in_week()); |
142 | } |
143 | duration_type get_neg_offset(const date_type& d) const |
144 | { |
145 | // fix compiler warnings |
146 | d.year(); |
147 | return duration_type(-f_*calendar_type::days_in_week()); |
148 | } |
149 | private: |
150 | int f_; |
151 | }; |
152 | |
153 | //! Functor to iterate by a year adjusting for leap years |
154 | template<class date_type> |
155 | class year_functor |
156 | { |
157 | public: |
158 | //typedef typename date_type::year_type year_type; |
159 | typedef typename date_type::duration_type duration_type; |
160 | year_functor(int f) : _mf(f * 12) {} |
161 | duration_type get_offset(const date_type& d) const |
162 | { |
163 | return _mf.get_offset(d); |
164 | } |
165 | duration_type get_neg_offset(const date_type& d) const |
166 | { |
167 | return _mf.get_neg_offset(d); |
168 | } |
169 | private: |
170 | month_functor<date_type> _mf; |
171 | }; |
172 | |
173 | |
174 | } }//namespace date_time |
175 | |
176 | |
177 | #endif |
178 | |
179 | |