date_time/posix_time/date_duration_operators.hpp

0001 #ifndef DATE_DURATION_OPERATORS_HPP___
0002 #define DATE_DURATION_OPERATORS_HPP___
0003
0004 /* Copyright (c) 2004 CrystalClear Software, Inc.
0005  * Subject to the Boost Software License, Version 1.0.
0006  * (See accompanying file LICENSE_1_0.txt or
0007  * http://www.boost.org/LICENSE_1_0.txt)
0008  * Author: Jeff Garland, Bart Garst
0009  * $Date$
0010  */
0011
0012 #include "boost/date_time/gregorian/greg_duration_types.hpp"
0013 #include "boost/date_time/posix_time/ptime.hpp"
0014
0015 namespace boost {
0016 namespace posix_time {
0017
0018   /*!@file date_duration_operators.hpp Operators for ptime and
0019    * optional gregorian types. Operators use snap-to-end-of-month behavior.
0020    * Further details on this behavior can be found in reference for
0021    * date_time/date_duration_types.hpp and documentation for
0022    * month and year iterators.
0023    */
0024
0025
0026   /*! Adds a months object and a ptime. Result will be same
0027    * day-of-month as ptime unless original day was the last day of month.
0028    * see date_time::months_duration for more details */
0029   inline BOOST_CXX14_CONSTEXPR
0030   ptime
0031   operator+(const ptime& t, const boost::gregorian::months& m)
0032   {
0033     return t + m.get_offset(t.date());
0034   }
0035
0036   /*! Adds a months object to a ptime. Result will be same
0037    * day-of-month as ptime unless original day was the last day of month.
0038    * see date_time::months_duration for more details */
0039   inline BOOST_CXX14_CONSTEXPR
0040   ptime
0041   operator+=(ptime& t, const boost::gregorian::months& m)
0042   {
0043     // get_neg_offset returns a negative duration, so we add
0044     return t += m.get_offset(t.date());
0045   }
0046
0047   /*! Subtracts a months object and a ptime. Result will be same
0048    * day-of-month as ptime unless original day was the last day of month.
0049    * see date_time::months_duration for more details */
0050   inline BOOST_CXX14_CONSTEXPR
0051   ptime
0052   operator-(const ptime& t, const boost::gregorian::months& m)
0053   {
0054     // get_neg_offset returns a negative duration, so we add
0055     return t + m.get_neg_offset(t.date());
0056   }
0057
0058   /*! Subtracts a months object from a ptime. Result will be same
0059    * day-of-month as ptime unless original day was the last day of month.
0060    * see date_time::months_duration for more details */
0061   inline BOOST_CXX14_CONSTEXPR
0062   ptime
0063   operator-=(ptime& t, const boost::gregorian::months& m)
0064   {
0065     return t += m.get_neg_offset(t.date());
0066   }
0067
0068   // ptime & years
0069
0070   /*! Adds a years object and a ptime. Result will be same
0071    * month and day-of-month as ptime unless original day was the
0072    * last day of month. see date_time::years_duration for more details */
0073   inline BOOST_CXX14_CONSTEXPR
0074   ptime
0075   operator+(const ptime& t, const boost::gregorian::years& y)
0076   {
0077     return t + y.get_offset(t.date());
0078   }
0079
0080   /*! Adds a years object to a ptime. Result will be same
0081    * month and day-of-month as ptime unless original day was the
0082    * last day of month. see date_time::years_duration for more details */
0083   inline BOOST_CXX14_CONSTEXPR
0084   ptime
0085   operator+=(ptime& t, const boost::gregorian::years& y)
0086   {
0087     return t += y.get_offset(t.date());
0088   }
0089
0090   /*! Subtracts a years object and a ptime. Result will be same
0091    * month and day-of-month as ptime unless original day was the
0092    * last day of month. see date_time::years_duration for more details */
0093   inline BOOST_CXX14_CONSTEXPR
0094   ptime
0095   operator-(const ptime& t, const boost::gregorian::years& y)
0096   {
0097     // get_neg_offset returns a negative duration, so we add
0098     return t + y.get_neg_offset(t.date());
0099   }
0100
0101   /*! Subtracts a years object from a ptime. Result will be same
0102    * month and day-of-month as ptime unless original day was the
0103    * last day of month. see date_time::years_duration for more details */
0104   inline BOOST_CXX14_CONSTEXPR
0105   ptime
0106   operator-=(ptime& t, const boost::gregorian::years& y)
0107   {
0108     // get_neg_offset returns a negative duration, so we add
0109     return t += y.get_neg_offset(t.date());
0110   }
0111
0112 }} // namespaces
0113
0114 #endif // DATE_DURATION_OPERATORS_HPP___