#ifndef LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___ | |
#define LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___ | |
/* Copyright (c) 2004 CrystalClear Software, Inc. | |
* Subject to the Boost Software License, Version 1.0. | |
* (See accompanying file LICENSE_1_0.txt or | |
* http://www.boost.org/LICENSE_1_0.txt) | |
* Author: Jeff Garland, Bart Garst | |
* $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ | |
*/ | |
#include "boost/date_time/gregorian/greg_duration_types.hpp" | |
#include "boost/date_time/local_time/local_date_time.hpp" | |
namespace boost { | |
namespace local_time { | |
/*!@file date_duration_operators.hpp Operators for local_date_time and | |
* optional gregorian types. Operators use snap-to-end-of-month behavior. | |
* Further details on this behavior can be found in reference for | |
* date_time/date_duration_types.hpp and documentation for | |
* month and year iterators. | |
*/ | |
/*! Adds a months object and a local_date_time. Result will be same | |
* day-of-month as local_date_time unless original day was the last day of month. | |
* see date_time::months_duration for more details */ | |
inline | |
local_date_time | |
operator+(const local_date_time& t, const boost::gregorian::months& m) | |
{ | |
return t + m.get_offset(t.utc_time().date()); | |
} | |
/*! Adds a months object to a local_date_time. Result will be same | |
* day-of-month as local_date_time unless original day was the last day of month. | |
* see date_time::months_duration for more details */ | |
inline | |
local_date_time | |
operator+=(local_date_time& t, const boost::gregorian::months& m) | |
{ | |
return t += m.get_offset(t.utc_time().date()); | |
} | |
/*! Subtracts a months object and a local_date_time. Result will be same | |
* day-of-month as local_date_time unless original day was the last day of month. | |
* see date_time::months_duration for more details */ | |
inline | |
local_date_time | |
operator-(const local_date_time& t, const boost::gregorian::months& m) | |
{ | |
// get_neg_offset returns a negative duration, so we add | |
return t + m.get_neg_offset(t.utc_time().date()); | |
} | |
/*! Subtracts a months object from a local_date_time. Result will be same | |
* day-of-month as local_date_time unless original day was the last day of month. | |
* see date_time::months_duration for more details */ | |
inline | |
local_date_time | |
operator-=(local_date_time& t, const boost::gregorian::months& m) | |
{ | |
// get_neg_offset returns a negative duration, so we add | |
return t += m.get_neg_offset(t.utc_time().date()); | |
} | |
// local_date_time & years | |
/*! Adds a years object and a local_date_time. Result will be same | |
* month and day-of-month as local_date_time unless original day was the | |
* last day of month. see date_time::years_duration for more details */ | |
inline | |
local_date_time | |
operator+(const local_date_time& t, const boost::gregorian::years& y) | |
{ | |
return t + y.get_offset(t.utc_time().date()); | |
} | |
/*! Adds a years object to a local_date_time. Result will be same | |
* month and day-of-month as local_date_time unless original day was the | |
* last day of month. see date_time::years_duration for more details */ | |
inline | |
local_date_time | |
operator+=(local_date_time& t, const boost::gregorian::years& y) | |
{ | |
return t += y.get_offset(t.utc_time().date()); | |
} | |
/*! Subtracts a years object and a local_date_time. Result will be same | |
* month and day-of-month as local_date_time unless original day was the | |
* last day of month. see date_time::years_duration for more details */ | |
inline | |
local_date_time | |
operator-(const local_date_time& t, const boost::gregorian::years& y) | |
{ | |
// get_neg_offset returns a negative duration, so we add | |
return t + y.get_neg_offset(t.utc_time().date()); | |
} | |
/*! Subtracts a years object from a local_date_time. Result will be same | |
* month and day-of-month as local_date_time unless original day was the | |
* last day of month. see date_time::years_duration for more details */ | |
inline | |
local_date_time | |
operator-=(local_date_time& t, const boost::gregorian::years& y) | |
{ | |
// get_neg_offset returns a negative duration, so we add | |
return t += y.get_neg_offset(t.utc_time().date()); | |
} | |
}} // namespaces | |
#endif // LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___ |