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 operator +(const ptime & t,const boost::gregorian::months & m)31 operator+(const ptime& t, const boost::gregorian::months& m) 32 { 33 return t + m.get_offset(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 operator +=(ptime & t,const boost::gregorian::months & m)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(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 operator -(const ptime & t,const boost::gregorian::months & m)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(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 operator -=(ptime & t,const boost::gregorian::months & m)63 operator-=(ptime& t, const boost::gregorian::months& m) 64 { 65 return t += m.get_neg_offset(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 operator +(const ptime & t,const boost::gregorian::years & y)75 operator+(const ptime& t, const boost::gregorian::years& y) 76 { 77 return t + y.get_offset(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 operator +=(ptime & t,const boost::gregorian::years & y)85 operator+=(ptime& t, const boost::gregorian::years& y) 86 { 87 return t += y.get_offset(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 operator -(const ptime & t,const boost::gregorian::years & y)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(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 operator -=(ptime & t,const boost::gregorian::years & y)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(t.date()); 110 } 111 112 }} // namespaces 113 114 #endif // DATE_DURATION_OPERATORS_HPP___ 115