boost/date_time/local_time/date_duration_operators.hpp
#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
* $Date$
*/
#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___
