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1 | #ifndef LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___ | |
2 | #define LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___ | |
3 | ||
4 | /* Copyright (c) 2004 CrystalClear Software, Inc. | |
5 | * Subject to the Boost Software License, Version 1.0. | |
6 | * (See accompanying file LICENSE_1_0.txt or | |
7 | * http://www.boost.org/LICENSE_1_0.txt) | |
8 | * Author: Jeff Garland, Bart Garst | |
9 | * $Date$ | |
10 | */ | |
11 | ||
12 | #include "boost/date_time/gregorian/greg_duration_types.hpp" | |
13 | #include "boost/date_time/local_time/local_date_time.hpp" | |
14 | ||
15 | namespace boost { | |
16 | namespace local_time { | |
17 | ||
18 | /*!@file date_duration_operators.hpp Operators for local_date_time and | |
19 | * optional gregorian types. Operators use snap-to-end-of-month behavior. | |
20 | * Further details on this behavior can be found in reference for | |
21 | * date_time/date_duration_types.hpp and documentation for | |
22 | * month and year iterators. | |
23 | */ | |
24 | ||
25 | ||
26 | /*! Adds a months object and a local_date_time. Result will be same | |
27 | * day-of-month as local_date_time unless original day was the last day of month. | |
28 | * see date_time::months_duration for more details */ | |
29 | inline | |
30 | local_date_time | |
31 | operator+(const local_date_time& t, const boost::gregorian::months& m) | |
32 | { | |
33 | return t + m.get_offset(t.utc_time().date()); | |
34 | } | |
35 | ||
36 | /*! Adds a months object to a local_date_time. Result will be same | |
37 | * day-of-month as local_date_time unless original day was the last day of month. | |
38 | * see date_time::months_duration for more details */ | |
39 | inline | |
40 | local_date_time | |
41 | operator+=(local_date_time& t, const boost::gregorian::months& m) | |
42 | { | |
43 | return t += m.get_offset(t.utc_time().date()); | |
44 | } | |
45 | ||
46 | /*! Subtracts a months object and a local_date_time. Result will be same | |
47 | * day-of-month as local_date_time unless original day was the last day of month. | |
48 | * see date_time::months_duration for more details */ | |
49 | inline | |
50 | local_date_time | |
51 | operator-(const local_date_time& t, const boost::gregorian::months& m) | |
52 | { | |
53 | // get_neg_offset returns a negative duration, so we add | |
54 | return t + m.get_neg_offset(t.utc_time().date()); | |
55 | } | |
56 | ||
57 | /*! Subtracts a months object from a local_date_time. Result will be same | |
58 | * day-of-month as local_date_time unless original day was the last day of month. | |
59 | * see date_time::months_duration for more details */ | |
60 | inline | |
61 | local_date_time | |
62 | operator-=(local_date_time& t, const boost::gregorian::months& m) | |
63 | { | |
64 | // get_neg_offset returns a negative duration, so we add | |
65 | return t += m.get_neg_offset(t.utc_time().date()); | |
66 | } | |
67 | ||
68 | // local_date_time & years | |
69 | ||
70 | /*! Adds a years object and a local_date_time. Result will be same | |
71 | * month and day-of-month as local_date_time unless original day was the | |
72 | * last day of month. see date_time::years_duration for more details */ | |
73 | inline | |
74 | local_date_time | |
75 | operator+(const local_date_time& t, const boost::gregorian::years& y) | |
76 | { | |
77 | return t + y.get_offset(t.utc_time().date()); | |
78 | } | |
79 | ||
80 | /*! Adds a years object to a local_date_time. Result will be same | |
81 | * month and day-of-month as local_date_time unless original day was the | |
82 | * last day of month. see date_time::years_duration for more details */ | |
83 | inline | |
84 | local_date_time | |
85 | operator+=(local_date_time& t, const boost::gregorian::years& y) | |
86 | { | |
87 | return t += y.get_offset(t.utc_time().date()); | |
88 | } | |
89 | ||
90 | /*! Subtracts a years object and a local_date_time. Result will be same | |
91 | * month and day-of-month as local_date_time unless original day was the | |
92 | * last day of month. see date_time::years_duration for more details */ | |
93 | inline | |
94 | local_date_time | |
95 | operator-(const local_date_time& t, const boost::gregorian::years& y) | |
96 | { | |
97 | // get_neg_offset returns a negative duration, so we add | |
98 | return t + y.get_neg_offset(t.utc_time().date()); | |
99 | } | |
100 | ||
101 | /*! Subtracts a years object from a local_date_time. Result will be same | |
102 | * month and day-of-month as local_date_time unless original day was the | |
103 | * last day of month. see date_time::years_duration for more details */ | |
104 | inline | |
105 | local_date_time | |
106 | operator-=(local_date_time& t, const boost::gregorian::years& y) | |
107 | { | |
108 | // get_neg_offset returns a negative duration, so we add | |
109 | return t += y.get_neg_offset(t.utc_time().date()); | |
110 | } | |
111 | ||
112 | ||
113 | }} // namespaces | |
114 | ||
115 | #endif // LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___ |