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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