[857] | 1 | #ifndef LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___
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| 2 | #define LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___
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| 3 |
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| 4 | /* Copyright (c) 2004 CrystalClear Software, Inc.
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| 5 | * Subject to the Boost Software License, Version 1.0.
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| 6 | * (See accompanying file LICENSE-1.0 or
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| 7 | * http://www.boost.org/LICENSE-1.0)
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| 8 | * Author: Jeff Garland, Bart Garst
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| 9 | * $Date: 2005/01/09 20:23:48 $
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| 10 | */
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| 11 |
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| 12 | #include "boost/date_time/gregorian/greg_duration_types.hpp"
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| 13 | #include "boost/date_time/local_time/local_date_time.hpp"
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| 14 |
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| 15 | namespace boost {
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| 16 | namespace local_time {
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| 17 |
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| 18 | /*!@file date_duration_operators.hpp Operators for local_date_time and
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| 19 | * optional gregorian types. Operators use snap-to-end-of-month behavior.
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| 20 | * Further details on this behavior can be found in reference for
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| 21 | * date_time/date_duration_types.hpp and documentation for
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| 22 | * month and year iterators.
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| 23 | */
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| 24 |
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| 25 |
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| 26 | /*! Adds a months object and a local_date_time. Result will be same
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| 27 | * day-of-month as local_date_time unless original day was the last day of month.
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| 28 | * see date_time::months_duration for more details */
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| 29 | inline
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| 30 | local_date_time
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| 31 | operator+(const local_date_time& t, const boost::gregorian::months& m)
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| 32 | {
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| 33 | return t + m.get_offset(t.utc_time().date());
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| 34 | }
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| 35 |
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| 36 | /*! Adds a months object to a local_date_time. Result will be same
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| 37 | * day-of-month as local_date_time unless original day was the last day of month.
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| 38 | * see date_time::months_duration for more details */
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| 39 | inline
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| 40 | local_date_time
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| 41 | operator+=(local_date_time& t, const boost::gregorian::months& m)
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| 42 | {
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| 43 | return t += m.get_offset(t.utc_time().date());
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| 44 | }
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| 45 |
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| 46 | /*! Subtracts a months object and a local_date_time. Result will be same
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| 47 | * day-of-month as local_date_time unless original day was the last day of month.
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| 48 | * see date_time::months_duration for more details */
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| 49 | inline
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| 50 | local_date_time
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| 51 | operator-(const local_date_time& t, const boost::gregorian::months& m)
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| 52 | {
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| 53 | // get_neg_offset returns a negative duration, so we add
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| 54 | return t + m.get_neg_offset(t.utc_time().date());
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| 55 | }
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| 56 |
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| 57 | /*! Subtracts a months object from a local_date_time. Result will be same
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| 58 | * day-of-month as local_date_time unless original day was the last day of month.
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| 59 | * see date_time::months_duration for more details */
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| 60 | inline
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| 61 | local_date_time
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| 62 | operator-=(local_date_time& t, const boost::gregorian::months& m)
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| 63 | {
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| 64 | // get_neg_offset returns a negative duration, so we add
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| 65 | return t += m.get_neg_offset(t.utc_time().date());
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| 66 | }
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| 67 |
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| 68 | // local_date_time & years
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| 69 |
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| 70 | /*! Adds a years object and a local_date_time. Result will be same
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| 71 | * month and day-of-month as local_date_time unless original day was the
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| 72 | * last day of month. see date_time::years_duration for more details */
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| 73 | inline
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| 74 | local_date_time
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| 75 | operator+(const local_date_time& t, const boost::gregorian::years& y)
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| 76 | {
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| 77 | return t + y.get_offset(t.utc_time().date());
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| 78 | }
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| 79 |
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| 80 | /*! Adds a years object to a local_date_time. Result will be same
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| 81 | * month and day-of-month as local_date_time unless original day was the
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| 82 | * last day of month. see date_time::years_duration for more details */
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| 83 | inline
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| 84 | local_date_time
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| 85 | operator+=(local_date_time& t, const boost::gregorian::years& y)
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| 86 | {
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| 87 | return t += y.get_offset(t.utc_time().date());
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| 88 | }
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| 89 |
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| 90 | /*! Subtracts a years object and a local_date_time. Result will be same
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| 91 | * month and day-of-month as local_date_time unless original day was the
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| 92 | * last day of month. see date_time::years_duration for more details */
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| 93 | inline
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| 94 | local_date_time
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| 95 | operator-(const local_date_time& t, const boost::gregorian::years& y)
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| 96 | {
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| 97 | // get_neg_offset returns a negative duration, so we add
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| 98 | return t + y.get_neg_offset(t.utc_time().date());
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| 99 | }
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| 100 |
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| 101 | /*! Subtracts a years object from a local_date_time. Result will be same
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| 102 | * month and day-of-month as local_date_time unless original day was the
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| 103 | * last day of month. see date_time::years_duration for more details */
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| 104 | inline
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| 105 | local_date_time
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| 106 | operator-=(local_date_time& t, const boost::gregorian::years& y)
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| 107 | {
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| 108 | // get_neg_offset returns a negative duration, so we add
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| 109 | return t += y.get_neg_offset(t.utc_time().date());
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| 110 | }
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| 111 |
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| 112 |
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| 113 | }} // namespaces
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| 114 |
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| 115 | #endif // LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___
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