1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
#ifndef _DATE_TIME_ADJUST_FUNCTORS_HPP___
#define _DATE_TIME_ADJUST_FUNCTORS_HPP___
/* Copyright (c) 2002,2003 CrystalClear Software, Inc.
* Use, modification and distribution is subject to the
* Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
* Author: Jeff Garland, Bart Garst
* $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $
*/
#include "boost/date_time/date.hpp"
#include "boost/date_time/wrapping_int.hpp"
namespace boost {
namespace date_time {
//! Functor to iterate a fixed number of days
template<class date_type>
class day_functor
{
public:
typedef typename date_type::duration_type duration_type;
day_functor(int f) : f_(f) {}
duration_type get_offset(const date_type& d) const
{
// why is 'd' a parameter???
// fix compiler warnings
d.year();
return duration_type(f_);
}
duration_type get_neg_offset(const date_type& d) const
{
// fix compiler warnings
d.year();
return duration_type(-f_);
}
private:
int f_;
};
//! Provides calculation to find next nth month given a date
/*! This adjustment function provides the logic for 'month-based'
* advancement on a ymd based calendar. The policy it uses
* to handle the non existant end of month days is to back
* up to the last day of the month. Also, if the starting
* date is the last day of a month, this functor will attempt
* to adjust to the end of the month.
*/
template<class date_type>
class month_functor
{
public:
typedef typename date_type::duration_type duration_type;
typedef typename date_type::calendar_type cal_type;
typedef typename cal_type::ymd_type ymd_type;
typedef typename cal_type::day_type day_type;
month_functor(int f) : f_(f), origDayOfMonth_(0) {}
duration_type get_offset(const date_type& d) const
{
ymd_type ymd(d.year_month_day());
if (origDayOfMonth_ == 0) {
origDayOfMonth_ = ymd.day;
day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month));
if (endOfMonthDay == ymd.day) {
origDayOfMonth_ = -1; //force the value to the end of month
}
}
typedef date_time::wrapping_int2<short,1,12> wrap_int2;
typedef typename wrap_int2::int_type int_type;
wrap_int2 wi(ymd.month);
//calc the year wrap around, add() returns 0 or 1 if wrapped
int_type year = wi.add(static_cast<int_type>(f_));
year = static_cast<int_type>(year + ymd.year); //calculate resulting year
// std::cout << "trace wi: " << wi.as_int() << std::endl;
// std::cout << "trace year: " << year << std::endl;
//find the last day for the new month
day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int()));
//original was the end of month -- force to last day of month
if (origDayOfMonth_ == -1) {
return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d;
}
day_type dayOfMonth = origDayOfMonth_;
if (dayOfMonth > resultingEndOfMonthDay) {
dayOfMonth = resultingEndOfMonthDay;
}
return date_type(year, wi.as_int(), dayOfMonth) - d;
}
//! Returns a negative duration_type
duration_type get_neg_offset(const date_type& d) const
{
ymd_type ymd(d.year_month_day());
if (origDayOfMonth_ == 0) {
origDayOfMonth_ = ymd.day;
day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month));
if (endOfMonthDay == ymd.day) {
origDayOfMonth_ = -1; //force the value to the end of month
}
}
typedef date_time::wrapping_int2<short,1,12> wrap_int2;
typedef typename wrap_int2::int_type int_type;
wrap_int2 wi(ymd.month);
//calc the year wrap around, add() returns 0 or 1 if wrapped
int_type year = wi.subtract(static_cast<int_type>(f_));
year = static_cast<int_type>(year + ymd.year); //calculate resulting year
//find the last day for the new month
day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int()));
//original was the end of month -- force to last day of month
if (origDayOfMonth_ == -1) {
return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d;
}
day_type dayOfMonth = origDayOfMonth_;
if (dayOfMonth > resultingEndOfMonthDay) {
dayOfMonth = resultingEndOfMonthDay;
}
return date_type(year, wi.as_int(), dayOfMonth) - d;
}
private:
int f_;
mutable short origDayOfMonth_;
};
//! Functor to iterate a over weeks
template<class date_type>
class week_functor
{
public:
typedef typename date_type::duration_type duration_type;
typedef typename date_type::calendar_type calendar_type;
week_functor(int f) : f_(f) {}
duration_type get_offset(const date_type& d) const
{
// why is 'd' a parameter???
// fix compiler warnings
d.year();
return duration_type(f_*calendar_type::days_in_week());
}
duration_type get_neg_offset(const date_type& d) const
{
// fix compiler warnings
d.year();
return duration_type(-f_*calendar_type::days_in_week());
}
private:
int f_;
};
//! Functor to iterate by a year adjusting for leap years
template<class date_type>
class year_functor
{
public:
//typedef typename date_type::year_type year_type;
typedef typename date_type::duration_type duration_type;
year_functor(int f) : _mf(f * 12) {}
duration_type get_offset(const date_type& d) const
{
return _mf.get_offset(d);
}
duration_type get_neg_offset(const date_type& d) const
{
return _mf.get_neg_offset(d);
}
private:
month_functor<date_type> _mf;
};
} }//namespace date_time
#endif
|
