boost/date_time/time_system_split.hpp

   1 #ifndef DATE_TIME_TIME_SYSTEM_SPLIT_HPP
   2 #define DATE_TIME_TIME_SYSTEM_SPLIT_HPP
   3
   4 /* Copyright (c) 2002,2003,2005 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  * $Date$
  10  */
  11
  12
  13 #include <string>
  14 #include "boost/date_time/compiler_config.hpp"
  15 #include "boost/date_time/special_defs.hpp"
  16
  17 namespace boost {
  18 namespace date_time {
  19
  20   //! An unadjusted time system implementation.
  21 #if (defined(BOOST_DATE_TIME_NO_MEMBER_INIT))
  22   template<typename config, boost::int32_t ticks_per_second>
  23 #else
  24   template<typename config>
  25 #endif
  26   class split_timedate_system
  27   {
  28    public:
  29     typedef typename config::time_rep_type time_rep_type;
  30     typedef typename config::date_type     date_type;
  31     typedef typename config::time_duration_type time_duration_type;
  32     typedef typename config::date_duration_type date_duration_type;
  33     typedef typename config::int_type int_type;
  34     typedef typename config::resolution_traits   resolution_traits;
  35
  36     //86400 is number of seconds in a day...
  37 #if (defined(BOOST_DATE_TIME_NO_MEMBER_INIT))
  38     typedef date_time::wrapping_int<int_type, INT64_C(86400) * ticks_per_second > wrap_int_type;
  39 #else
  40    private:
  41      BOOST_STATIC_CONSTANT(int_type, ticks_per_day = INT64_C(86400) * config::tick_per_second);
  42    public:
  43 # if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0X581) )
  44     typedef date_time::wrapping_int< split_timedate_system::int_type, split_timedate_system::ticks_per_day> wrap_int_type;
  45 # else
  46     typedef date_time::wrapping_int<int_type, ticks_per_day> wrap_int_type;
  47 #endif
  48 #endif
  49
  50     static time_rep_type get_time_rep(special_values sv)
  51     {
  52       switch (sv) {
  53       case not_a_date_time:
  54         return time_rep_type(date_type(not_a_date_time),
  55                              time_duration_type(not_a_date_time));
  56       case pos_infin:
  57         return time_rep_type(date_type(pos_infin),
  58                              time_duration_type(pos_infin));
  59       case neg_infin:
  60         return time_rep_type(date_type(neg_infin),
  61                              time_duration_type(neg_infin));
  62       case max_date_time: {
  63         time_duration_type td = time_duration_type(24,0,0,0) - time_duration_type(0,0,0,1);
  64         return time_rep_type(date_type(max_date_time), td);
  65       }
  66       case min_date_time:
  67         return time_rep_type(date_type(min_date_time), time_duration_type(0,0,0,0));
  68
  69       default:
  70         return time_rep_type(date_type(not_a_date_time),
  71                              time_duration_type(not_a_date_time));
  72
  73       }
  74
  75     }
  76
  77     static time_rep_type get_time_rep(const date_type& day,
  78                                       const time_duration_type& tod,
  79                                       date_time::dst_flags /* dst */ = not_dst)
  80     {
  81       if(day.is_special() || tod.is_special()) {
  82         if(day.is_not_a_date() || tod.is_not_a_date_time()) {
  83           return time_rep_type(date_type(not_a_date_time),
  84                                time_duration_type(not_a_date_time));
  85         }
  86         else if(day.is_pos_infinity()) {
  87           if(tod.is_neg_infinity()) {
  88             return time_rep_type(date_type(not_a_date_time),
  89                                  time_duration_type(not_a_date_time));
  90           }
  91           else {
  92             return time_rep_type(day, time_duration_type(pos_infin));
  93           }
  94         }
  95         else if(day.is_neg_infinity()) {
  96           if(tod.is_pos_infinity()) {
  97             return time_rep_type(date_type(not_a_date_time),
  98                                  time_duration_type(not_a_date_time));
  99           }
 100           else {
 101             return time_rep_type(day, time_duration_type(neg_infin));
 102           }
 103         }
 104         else if(tod.is_pos_infinity()) {
 105           if(day.is_neg_infinity()) {
 106             return time_rep_type(date_type(not_a_date_time),
 107                                  time_duration_type(not_a_date_time));
 108           }
 109           else {
 110             return time_rep_type(date_type(pos_infin), tod);
 111           }
 112         }
 113         else if(tod.is_neg_infinity()) {
 114           if(day.is_pos_infinity()) {
 115             return time_rep_type(date_type(not_a_date_time),
 116                                  time_duration_type(not_a_date_time));
 117           }
 118           else {
 119             return time_rep_type(date_type(neg_infin), tod);
 120           }
 121         }
 122       }
 123       return time_rep_type(day, tod);
 124     }
 125     static date_type get_date(const time_rep_type& val)
 126     {
 127       return date_type(val.day);
 128     }
 129     static time_duration_type get_time_of_day(const time_rep_type& val)
 130     {
 131       return time_duration_type(val.time_of_day);
 132     }
 133     static std::string zone_name(const time_rep_type&)
 134     {
 135       return std::string();
 136     }
 137     static bool is_equal(const time_rep_type& lhs, const time_rep_type& rhs)
 138     {
 139       return ((lhs.day == rhs.day) && (lhs.time_of_day == rhs.time_of_day));
 140     }
 141     static bool is_less(const time_rep_type& lhs, const time_rep_type& rhs)
 142     {
 143       if (lhs.day < rhs.day) return true;
 144       if (lhs.day > rhs.day) return false;
 145       return (lhs.time_of_day < rhs.time_of_day);
 146     }
 147     static time_rep_type add_days(const time_rep_type& base,
 148                                   const date_duration_type& dd)
 149     {
 150       return time_rep_type(base.day+dd, base.time_of_day);
 151     }
 152     static time_rep_type subtract_days(const time_rep_type& base,
 153                                        const date_duration_type& dd)
 154     {
 155       return split_timedate_system::get_time_rep(base.day-dd, base.time_of_day);
 156     }
 157     static time_rep_type subtract_time_duration(const time_rep_type& base,
 158                                                 const time_duration_type& td)
 159     {
 160       if(base.day.is_special() || td.is_special())
 161       {
 162         return split_timedate_system::get_time_rep(base.day, -td);
 163       }
 164       if (td.is_negative()) {
 165         time_duration_type td1 = td.invert_sign();
 166         return add_time_duration(base,td1);
 167       }
 168
 169       wrap_int_type  day_offset(base.time_of_day.ticks());
 170       date_duration_type day_overflow(static_cast<typename date_duration_type::duration_rep_type>(day_offset.subtract(td.ticks())));
 171
 172       return time_rep_type(base.day-day_overflow,
 173                            time_duration_type(0,0,0,day_offset.as_int()));
 174     }
 175     static time_rep_type add_time_duration(const time_rep_type& base,
 176                                            time_duration_type td)
 177     {
 178       if(base.day.is_special() || td.is_special()) {
 179         return split_timedate_system::get_time_rep(base.day, td);
 180       }
 181       if (td.is_negative()) {
 182         time_duration_type td1 = td.invert_sign();
 183         return subtract_time_duration(base,td1);
 184       }
 185
 186       wrap_int_type day_offset(base.time_of_day.ticks());
 187       date_duration_type day_overflow(static_cast< typename date_duration_type::duration_rep_type >(day_offset.add(td.ticks())));
 188
 189       return time_rep_type(base.day+day_overflow,
 190                            time_duration_type(0,0,0,day_offset.as_int()));
 191     }
 192     static time_duration_type subtract_times(const time_rep_type& lhs,
 193                                              const time_rep_type& rhs)
 194     {
 195       date_duration_type dd = lhs.day - rhs.day;
 196       time_duration_type td(dd.days()*24,0,0); //days * 24 hours
 197       time_duration_type td2 = lhs.time_of_day - rhs.time_of_day;
 198       return td+td2;
 199       // return time_rep_type(base.day-dd, base.time_of_day);
 200     }
 201
 202   };
 203
 204 } } //namespace date_time
 205
 206
 207 #endif