1 | #ifndef DATE_DURATION_OPERATORS_HPP___ |
2 | #define 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/posix_time/ptime.hpp" |
14 | |
15 | namespace boost { |
16 | namespace posix_time { |
17 | |
18 | /*!@file date_duration_operators.hpp Operators for ptime 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 ptime. Result will be same |
27 | * day-of-month as ptime unless original day was the last day of month. |
28 | * see date_time::months_duration for more details */ |
29 | inline BOOST_CXX14_CONSTEXPR |
30 | ptime |
31 | operator+(const ptime& t, const boost::gregorian::months& m) |
32 | { |
33 | return t + m.get_offset(d: t.date()); |
34 | } |
35 | |
36 | /*! Adds a months object to a ptime. Result will be same |
37 | * day-of-month as ptime unless original day was the last day of month. |
38 | * see date_time::months_duration for more details */ |
39 | inline BOOST_CXX14_CONSTEXPR |
40 | ptime |
41 | operator+=(ptime& t, const boost::gregorian::months& m) |
42 | { |
43 | // get_neg_offset returns a negative duration, so we add |
44 | return t += m.get_offset(d: t.date()); |
45 | } |
46 | |
47 | /*! Subtracts a months object and a ptime. Result will be same |
48 | * day-of-month as ptime unless original day was the last day of month. |
49 | * see date_time::months_duration for more details */ |
50 | inline BOOST_CXX14_CONSTEXPR |
51 | ptime |
52 | operator-(const ptime& t, const boost::gregorian::months& m) |
53 | { |
54 | // get_neg_offset returns a negative duration, so we add |
55 | return t + m.get_neg_offset(d: t.date()); |
56 | } |
57 | |
58 | /*! Subtracts a months object from a ptime. Result will be same |
59 | * day-of-month as ptime unless original day was the last day of month. |
60 | * see date_time::months_duration for more details */ |
61 | inline BOOST_CXX14_CONSTEXPR |
62 | ptime |
63 | operator-=(ptime& t, const boost::gregorian::months& m) |
64 | { |
65 | return t += m.get_neg_offset(d: t.date()); |
66 | } |
67 | |
68 | // ptime & years |
69 | |
70 | /*! Adds a years object and a ptime. Result will be same |
71 | * month and day-of-month as ptime unless original day was the |
72 | * last day of month. see date_time::years_duration for more details */ |
73 | inline BOOST_CXX14_CONSTEXPR |
74 | ptime |
75 | operator+(const ptime& t, const boost::gregorian::years& y) |
76 | { |
77 | return t + y.get_offset(d: t.date()); |
78 | } |
79 | |
80 | /*! Adds a years object to a ptime. Result will be same |
81 | * month and day-of-month as ptime unless original day was the |
82 | * last day of month. see date_time::years_duration for more details */ |
83 | inline BOOST_CXX14_CONSTEXPR |
84 | ptime |
85 | operator+=(ptime& t, const boost::gregorian::years& y) |
86 | { |
87 | return t += y.get_offset(d: t.date()); |
88 | } |
89 | |
90 | /*! Subtracts a years object and a ptime. Result will be same |
91 | * month and day-of-month as ptime unless original day was the |
92 | * last day of month. see date_time::years_duration for more details */ |
93 | inline BOOST_CXX14_CONSTEXPR |
94 | ptime |
95 | operator-(const ptime& 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(d: t.date()); |
99 | } |
100 | |
101 | /*! Subtracts a years object from a ptime. Result will be same |
102 | * month and day-of-month as ptime unless original day was the |
103 | * last day of month. see date_time::years_duration for more details */ |
104 | inline BOOST_CXX14_CONSTEXPR |
105 | ptime |
106 | operator-=(ptime& 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(d: t.date()); |
110 | } |
111 | |
112 | }} // namespaces |
113 | |
114 | #endif // DATE_DURATION_OPERATORS_HPP___ |
115 | |