author | mikek |
Mon, 10 May 2010 19:54:49 +0100 | |
changeset 2 | 39c28ec933dd |
permissions | -rwxr-xr-x |
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#ifndef _DATE_TIME_ADJUST_FUNCTORS_HPP___ |
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#define _DATE_TIME_ADJUST_FUNCTORS_HPP___ |
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/* Copyright (c) 2002,2003 CrystalClear Software, Inc. |
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* Use, modification and distribution is subject to the |
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* Boost Software License, Version 1.0. (See accompanying |
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* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
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* Author: Jeff Garland, Bart Garst |
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* $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ |
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*/ |
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#include "boost/date_time/date.hpp" |
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#include "boost/date_time/wrapping_int.hpp" |
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namespace boost { |
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namespace date_time { |
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//! Functor to iterate a fixed number of days |
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template<class date_type> |
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class day_functor |
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{ |
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public: |
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typedef typename date_type::duration_type duration_type; |
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day_functor(int f) : f_(f) {} |
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duration_type get_offset(const date_type& d) const |
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{ |
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// why is 'd' a parameter??? |
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// fix compiler warnings |
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d.year(); |
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return duration_type(f_); |
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} |
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duration_type get_neg_offset(const date_type& d) const |
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{ |
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// fix compiler warnings |
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d.year(); |
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return duration_type(-f_); |
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} |
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private: |
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int f_; |
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}; |
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//! Provides calculation to find next nth month given a date |
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/*! This adjustment function provides the logic for 'month-based' |
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* advancement on a ymd based calendar. The policy it uses |
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* to handle the non existant end of month days is to back |
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* up to the last day of the month. Also, if the starting |
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* date is the last day of a month, this functor will attempt |
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* to adjust to the end of the month. |
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*/ |
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template<class date_type> |
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class month_functor |
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{ |
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public: |
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typedef typename date_type::duration_type duration_type; |
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typedef typename date_type::calendar_type cal_type; |
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typedef typename cal_type::ymd_type ymd_type; |
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typedef typename cal_type::day_type day_type; |
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month_functor(int f) : f_(f), origDayOfMonth_(0) {} |
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duration_type get_offset(const date_type& d) const |
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{ |
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ymd_type ymd(d.year_month_day()); |
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if (origDayOfMonth_ == 0) { |
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origDayOfMonth_ = ymd.day; |
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day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month)); |
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if (endOfMonthDay == ymd.day) { |
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origDayOfMonth_ = -1; //force the value to the end of month |
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} |
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} |
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typedef date_time::wrapping_int2<short,1,12> wrap_int2; |
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typedef typename wrap_int2::int_type int_type; |
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wrap_int2 wi(ymd.month); |
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//calc the year wrap around, add() returns 0 or 1 if wrapped |
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int_type year = wi.add(static_cast<int_type>(f_)); |
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year = static_cast<int_type>(year + ymd.year); //calculate resulting year |
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// std::cout << "trace wi: " << wi.as_int() << std::endl; |
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// std::cout << "trace year: " << year << std::endl; |
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//find the last day for the new month |
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day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int())); |
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//original was the end of month -- force to last day of month |
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if (origDayOfMonth_ == -1) { |
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return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d; |
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} |
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day_type dayOfMonth = origDayOfMonth_; |
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if (dayOfMonth > resultingEndOfMonthDay) { |
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dayOfMonth = resultingEndOfMonthDay; |
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} |
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return date_type(year, wi.as_int(), dayOfMonth) - d; |
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} |
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//! Returns a negative duration_type |
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duration_type get_neg_offset(const date_type& d) const |
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{ |
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ymd_type ymd(d.year_month_day()); |
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if (origDayOfMonth_ == 0) { |
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origDayOfMonth_ = ymd.day; |
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day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month)); |
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if (endOfMonthDay == ymd.day) { |
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origDayOfMonth_ = -1; //force the value to the end of month |
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} |
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} |
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typedef date_time::wrapping_int2<short,1,12> wrap_int2; |
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typedef typename wrap_int2::int_type int_type; |
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wrap_int2 wi(ymd.month); |
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//calc the year wrap around, add() returns 0 or 1 if wrapped |
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int_type year = wi.subtract(static_cast<int_type>(f_)); |
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year = static_cast<int_type>(year + ymd.year); //calculate resulting year |
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//find the last day for the new month |
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day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int())); |
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//original was the end of month -- force to last day of month |
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if (origDayOfMonth_ == -1) { |
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return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d; |
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} |
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day_type dayOfMonth = origDayOfMonth_; |
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if (dayOfMonth > resultingEndOfMonthDay) { |
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dayOfMonth = resultingEndOfMonthDay; |
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} |
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return date_type(year, wi.as_int(), dayOfMonth) - d; |
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} |
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private: |
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int f_; |
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mutable short origDayOfMonth_; |
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}; |
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//! Functor to iterate a over weeks |
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template<class date_type> |
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class week_functor |
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{ |
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public: |
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typedef typename date_type::duration_type duration_type; |
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typedef typename date_type::calendar_type calendar_type; |
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week_functor(int f) : f_(f) {} |
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duration_type get_offset(const date_type& d) const |
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{ |
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// why is 'd' a parameter??? |
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// fix compiler warnings |
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d.year(); |
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return duration_type(f_*calendar_type::days_in_week()); |
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} |
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duration_type get_neg_offset(const date_type& d) const |
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{ |
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// fix compiler warnings |
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d.year(); |
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return duration_type(-f_*calendar_type::days_in_week()); |
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} |
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private: |
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int f_; |
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}; |
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//! Functor to iterate by a year adjusting for leap years |
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template<class date_type> |
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class year_functor |
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{ |
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public: |
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//typedef typename date_type::year_type year_type; |
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typedef typename date_type::duration_type duration_type; |
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year_functor(int f) : _mf(f * 12) {} |
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duration_type get_offset(const date_type& d) const |
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{ |
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return _mf.get_offset(d); |
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} |
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duration_type get_neg_offset(const date_type& d) const |
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{ |
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return _mf.get_neg_offset(d); |
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} |
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private: |
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month_functor<date_type> _mf; |
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}; |
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} }//namespace date_time |
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#endif |
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