#ifndef _DATE_TIME_ADJUST_FUNCTORS_HPP___ | |
#define _DATE_TIME_ADJUST_FUNCTORS_HPP___ | |
/* Copyright (c) 2002,2003 CrystalClear Software, Inc. | |
* Use, modification and distribution is 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/date.hpp" | |
#include "boost/date_time/wrapping_int.hpp" | |
namespace boost { | |
namespace date_time { | |
//! Functor to iterate a fixed number of days | |
template<class date_type> | |
class day_functor | |
{ | |
public: | |
typedef typename date_type::duration_type duration_type; | |
day_functor(int f) : f_(f) {} | |
duration_type get_offset(const date_type& d) const | |
{ | |
// why is 'd' a parameter??? | |
// fix compiler warnings | |
d.year(); | |
return duration_type(f_); | |
} | |
duration_type get_neg_offset(const date_type& d) const | |
{ | |
// fix compiler warnings | |
d.year(); | |
return duration_type(-f_); | |
} | |
private: | |
int f_; | |
}; | |
//! Provides calculation to find next nth month given a date | |
/*! This adjustment function provides the logic for 'month-based' | |
* advancement on a ymd based calendar. The policy it uses | |
* to handle the non existant end of month days is to back | |
* up to the last day of the month. Also, if the starting | |
* date is the last day of a month, this functor will attempt | |
* to adjust to the end of the month. | |
*/ | |
template<class date_type> | |
class month_functor | |
{ | |
public: | |
typedef typename date_type::duration_type duration_type; | |
typedef typename date_type::calendar_type cal_type; | |
typedef typename cal_type::ymd_type ymd_type; | |
typedef typename cal_type::day_type day_type; | |
month_functor(int f) : f_(f), origDayOfMonth_(0) {} | |
duration_type get_offset(const date_type& d) const | |
{ | |
ymd_type ymd(d.year_month_day()); | |
if (origDayOfMonth_ == 0) { | |
origDayOfMonth_ = ymd.day; | |
day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month)); | |
if (endOfMonthDay == ymd.day) { | |
origDayOfMonth_ = -1; //force the value to the end of month | |
} | |
} | |
typedef date_time::wrapping_int2<short,1,12> wrap_int2; | |
typedef typename wrap_int2::int_type int_type; | |
wrap_int2 wi(ymd.month); | |
//calc the year wrap around, add() returns 0 or 1 if wrapped | |
int_type year = wi.add(static_cast<int_type>(f_)); | |
year = static_cast<int_type>(year + ymd.year); //calculate resulting year | |
// std::cout << "trace wi: " << wi.as_int() << std::endl; | |
// std::cout << "trace year: " << year << std::endl; | |
//find the last day for the new month | |
day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int())); | |
//original was the end of month -- force to last day of month | |
if (origDayOfMonth_ == -1) { | |
return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d; | |
} | |
day_type dayOfMonth = origDayOfMonth_; | |
if (dayOfMonth > resultingEndOfMonthDay) { | |
dayOfMonth = resultingEndOfMonthDay; | |
} | |
return date_type(year, wi.as_int(), dayOfMonth) - d; | |
} | |
//! Returns a negative duration_type | |
duration_type get_neg_offset(const date_type& d) const | |
{ | |
ymd_type ymd(d.year_month_day()); | |
if (origDayOfMonth_ == 0) { | |
origDayOfMonth_ = ymd.day; | |
day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month)); | |
if (endOfMonthDay == ymd.day) { | |
origDayOfMonth_ = -1; //force the value to the end of month | |
} | |
} | |
typedef date_time::wrapping_int2<short,1,12> wrap_int2; | |
typedef typename wrap_int2::int_type int_type; | |
wrap_int2 wi(ymd.month); | |
//calc the year wrap around, add() returns 0 or 1 if wrapped | |
int_type year = wi.subtract(static_cast<int_type>(f_)); | |
year = static_cast<int_type>(year + ymd.year); //calculate resulting year | |
//find the last day for the new month | |
day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int())); | |
//original was the end of month -- force to last day of month | |
if (origDayOfMonth_ == -1) { | |
return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d; | |
} | |
day_type dayOfMonth = origDayOfMonth_; | |
if (dayOfMonth > resultingEndOfMonthDay) { | |
dayOfMonth = resultingEndOfMonthDay; | |
} | |
return date_type(year, wi.as_int(), dayOfMonth) - d; | |
} | |
private: | |
int f_; | |
mutable short origDayOfMonth_; | |
}; | |
//! Functor to iterate a over weeks | |
template<class date_type> | |
class week_functor | |
{ | |
public: | |
typedef typename date_type::duration_type duration_type; | |
typedef typename date_type::calendar_type calendar_type; | |
week_functor(int f) : f_(f) {} | |
duration_type get_offset(const date_type& d) const | |
{ | |
// why is 'd' a parameter??? | |
// fix compiler warnings | |
d.year(); | |
return duration_type(f_*calendar_type::days_in_week()); | |
} | |
duration_type get_neg_offset(const date_type& d) const | |
{ | |
// fix compiler warnings | |
d.year(); | |
return duration_type(-f_*calendar_type::days_in_week()); | |
} | |
private: | |
int f_; | |
}; | |
//! Functor to iterate by a year adjusting for leap years | |
template<class date_type> | |
class year_functor | |
{ | |
public: | |
//typedef typename date_type::year_type year_type; | |
typedef typename date_type::duration_type duration_type; | |
year_functor(int f) : _mf(f * 12) {} | |
duration_type get_offset(const date_type& d) const | |
{ | |
return _mf.get_offset(d); | |
} | |
duration_type get_neg_offset(const date_type& d) const | |
{ | |
return _mf.get_neg_offset(d); | |
} | |
private: | |
month_functor<date_type> _mf; | |
}; | |
} }//namespace date_time | |
#endif | |