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/Src/Dependencies/Boost/boost/date_time/adjust_functors.hpp

http://hadesmem.googlecode.com/
C++ Header | 178 lines | 127 code | 16 blank | 35 comment | 14 complexity | bfd8c7c4d72456e55ccbed6747c610ba MD5 | raw file
  1#ifndef _DATE_TIME_ADJUST_FUNCTORS_HPP___
  2#define _DATE_TIME_ADJUST_FUNCTORS_HPP___
  3
  4/* Copyright (c) 2002,2003 CrystalClear Software, Inc.
  5 * Use, modification and distribution is subject to the 
  6 * Boost Software License, Version 1.0. (See accompanying
  7 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
  8 * Author: Jeff Garland, Bart Garst
  9 * $Date: 2008-02-28 07:00:24 +1100 (Thu, 28 Feb 2008) $
 10 */
 11
 12#include "boost/date_time/date.hpp"
 13#include "boost/date_time/wrapping_int.hpp"
 14
 15namespace boost {
 16namespace date_time {
 17  
 18
 19  //! Functor to iterate a fixed number of days
 20  template<class date_type>
 21  class day_functor 
 22  {
 23  public:
 24    typedef typename date_type::duration_type duration_type;
 25    day_functor(int f) : f_(f) {}
 26    duration_type get_offset(const date_type& d) const 
 27    {
 28      // why is 'd' a parameter???
 29      // fix compiler warnings
 30      d.year();
 31      return duration_type(f_);
 32    }
 33    duration_type get_neg_offset(const date_type& d) const 
 34    {
 35      // fix compiler warnings
 36      d.year();
 37      return duration_type(-f_);
 38    }
 39  private:
 40    int f_;
 41  };
 42
 43
 44  //! Provides calculation to find next nth month given a date
 45  /*! This adjustment function provides the logic for 'month-based'
 46   *  advancement on a ymd based calendar.  The policy it uses 
 47   *  to handle the non existant end of month days is to back
 48   *  up to the last day of the month.  Also, if the starting
 49   *  date is the last day of a month, this functor will attempt
 50   *  to adjust to the end of the month.
 51
 52   */
 53  template<class date_type>
 54  class month_functor 
 55  {
 56  public:
 57    typedef typename date_type::duration_type duration_type;
 58    typedef typename date_type::calendar_type cal_type;
 59    typedef typename cal_type::ymd_type ymd_type;
 60    typedef typename cal_type::day_type day_type;
 61
 62    month_functor(int f) : f_(f), origDayOfMonth_(0) {}
 63    duration_type get_offset(const date_type& d) const 
 64    {
 65      ymd_type ymd(d.year_month_day());
 66      if (origDayOfMonth_ == 0) {
 67        origDayOfMonth_ = ymd.day;
 68        day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month));
 69        if (endOfMonthDay == ymd.day) {
 70          origDayOfMonth_ = -1; //force the value to the end of month
 71        }
 72      }
 73      typedef date_time::wrapping_int2<short,1,12> wrap_int2;
 74      typedef typename wrap_int2::int_type int_type;
 75      wrap_int2 wi(ymd.month);
 76      //calc the year wrap around, add() returns 0 or 1 if wrapped
 77      int_type year = wi.add(static_cast<int_type>(f_)); 
 78      year = static_cast<int_type>(year + ymd.year); //calculate resulting year
 79//       std::cout << "trace wi: " << wi.as_int() << std::endl;
 80//       std::cout << "trace year: " << year << std::endl;
 81      //find the last day for the new month
 82      day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int()));
 83      //original was the end of month -- force to last day of month
 84      if (origDayOfMonth_ == -1) {
 85        return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d;
 86      }
 87      day_type dayOfMonth = origDayOfMonth_;
 88      if (dayOfMonth > resultingEndOfMonthDay) {
 89        dayOfMonth = resultingEndOfMonthDay;
 90      }
 91      return date_type(year, wi.as_int(), dayOfMonth) - d;
 92    }
 93    //! Returns a negative duration_type
 94    duration_type get_neg_offset(const date_type& d) const 
 95    {
 96      ymd_type ymd(d.year_month_day());
 97      if (origDayOfMonth_ == 0) {
 98        origDayOfMonth_ = ymd.day;
 99        day_type endOfMonthDay(cal_type::end_of_month_day(ymd.year,ymd.month));
100        if (endOfMonthDay == ymd.day) {
101          origDayOfMonth_ = -1; //force the value to the end of month
102        }
103      }
104      typedef date_time::wrapping_int2<short,1,12> wrap_int2;
105      typedef typename wrap_int2::int_type int_type;
106      wrap_int2 wi(ymd.month);
107      //calc the year wrap around, add() returns 0 or 1 if wrapped
108      int_type year = wi.subtract(static_cast<int_type>(f_)); 
109      year = static_cast<int_type>(year + ymd.year); //calculate resulting year
110      //find the last day for the new month
111      day_type resultingEndOfMonthDay(cal_type::end_of_month_day(year, wi.as_int()));
112      //original was the end of month -- force to last day of month
113      if (origDayOfMonth_ == -1) {
114        return date_type(year, wi.as_int(), resultingEndOfMonthDay) - d;
115      }
116      day_type dayOfMonth = origDayOfMonth_;
117      if (dayOfMonth > resultingEndOfMonthDay) {
118        dayOfMonth = resultingEndOfMonthDay;
119      }
120      return date_type(year, wi.as_int(), dayOfMonth) - d;
121    }
122  private:
123    int f_;
124    mutable short origDayOfMonth_;
125  };
126
127
128  //! Functor to iterate a over weeks
129  template<class date_type>
130  class week_functor 
131  {
132  public:
133    typedef typename date_type::duration_type duration_type;
134    typedef typename date_type::calendar_type calendar_type;
135    week_functor(int f) : f_(f) {}
136    duration_type get_offset(const date_type& d) const 
137    {
138      // why is 'd' a parameter???
139      // fix compiler warnings
140      d.year();
141      return duration_type(f_*calendar_type::days_in_week());
142    }
143    duration_type get_neg_offset(const date_type& d) const 
144    {
145      // fix compiler warnings
146      d.year();
147      return duration_type(-f_*calendar_type::days_in_week());
148    }
149  private:
150    int f_;
151  };
152
153  //! Functor to iterate by a year adjusting for leap years
154  template<class date_type>
155  class year_functor 
156  {
157  public:
158    //typedef typename date_type::year_type year_type;
159    typedef typename date_type::duration_type duration_type;
160    year_functor(int f) : _mf(f * 12) {}
161    duration_type get_offset(const date_type& d) const 
162    {
163      return _mf.get_offset(d);
164    }
165    duration_type get_neg_offset(const date_type& d) const 
166    {
167      return _mf.get_neg_offset(d);
168    }
169  private:
170    month_functor<date_type> _mf;
171  };
172
173  
174} }//namespace date_time
175
176
177#endif
178