--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/imgtools/imglib/boostlibrary/boost/date_time/adjust_functors.hpp Mon May 10 19:54:49 2010 +0100
@@ -0,0 +1,178 @@
+#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
+