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

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C++ Header | 254 lines | 206 code | 24 blank | 24 comment | 23 complexity | 321edf73a3683e5d45e1562805a87bd0 MD5 | raw file
  1#ifndef DATE_TIME_TIME_SYSTEM_COUNTED_HPP
  2#define DATE_TIME_TIME_SYSTEM_COUNTED_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
 13
 14#include "boost/date_time/time_defs.hpp"
 15#include <string>
 16
 17
 18namespace boost {
 19namespace date_time {
 20
 21  //! Time representation that uses a single integer count
 22  template<class config>
 23  struct counted_time_rep
 24  {
 25    typedef typename config::int_type   int_type;
 26    typedef typename config::date_type  date_type;
 27    typedef typename config::impl_type  impl_type;
 28    typedef typename date_type::duration_type date_duration_type;
 29    typedef typename date_type::calendar_type calendar_type;
 30    typedef typename date_type::ymd_type ymd_type;
 31    typedef typename config::time_duration_type time_duration_type;
 32    typedef typename config::resolution_traits   resolution_traits;
 33    
 34    counted_time_rep(const date_type& d, const time_duration_type& time_of_day) 
 35      : time_count_(1)
 36    {
 37      if(d.is_infinity() || d.is_not_a_date() || time_of_day.is_special()) {
 38        time_count_ = time_of_day.get_rep() + d.day_count();
 39        //std::cout << time_count_ << std::endl;
 40      }
 41      else {    
 42        time_count_ = (d.day_number() * frac_sec_per_day()) + time_of_day.ticks();
 43      }
 44    }
 45    explicit counted_time_rep(int_type count) :
 46      time_count_(count)
 47    {}
 48    explicit counted_time_rep(impl_type count) :
 49      time_count_(count)
 50    {}
 51    date_type date() const
 52    {
 53      if(time_count_.is_special()) {
 54        return date_type(time_count_.as_special());
 55      }
 56      else {
 57        typename calendar_type::date_int_type dc = day_count();
 58        //std::cout << "time_rep here:" << dc << std::endl;
 59        ymd_type ymd = calendar_type::from_day_number(dc);
 60        return date_type(ymd);
 61      }
 62    }
 63    //int_type day_count() const
 64    unsigned long day_count() const
 65    {
 66      /* resolution_traits::as_number returns a boost::int64_t & 
 67       * frac_sec_per_day is also a boost::int64_t so, naturally, 
 68       * the division operation returns a boost::int64_t. 
 69       * The static_cast to an unsigned long is ok (results in no data loss) 
 70       * because frac_sec_per_day is either the number of 
 71       * microseconds per day, or the number of nanoseconds per day. 
 72       * Worst case scenario: resolution_traits::as_number returns the 
 73       * maximum value an int64_t can hold and frac_sec_per_day 
 74       * is microseconds per day (lowest possible value). 
 75       * The division operation will then return a value of 106751991 - 
 76       * easily fitting in an unsigned long. 
 77       */
 78      return static_cast<unsigned long>(resolution_traits::as_number(time_count_) / frac_sec_per_day());
 79    }
 80    int_type time_count() const
 81    {
 82      return resolution_traits::as_number(time_count_);
 83    }
 84    int_type tod() const
 85    {
 86      return resolution_traits::as_number(time_count_) % frac_sec_per_day();
 87    }
 88    static int_type frac_sec_per_day()
 89    {
 90      int_type seconds_per_day = 60*60*24;
 91      int_type fractional_sec_per_sec(resolution_traits::res_adjust());
 92      return seconds_per_day*fractional_sec_per_sec;
 93    }
 94    bool is_pos_infinity()const
 95    {
 96      return impl_type::is_pos_inf(time_count_.as_number());
 97    }
 98    bool is_neg_infinity()const
 99    {
100      return impl_type::is_neg_inf(time_count_.as_number());
101    }
102    bool is_not_a_date_time()const
103    {
104      return impl_type::is_not_a_number(time_count_.as_number());
105    }
106    bool is_special()const
107    {
108      return time_count_.is_special();
109    }
110    impl_type get_rep()const
111    {
112      return time_count_;
113    }
114  private:
115    impl_type time_count_;
116  };
117
118  //! An unadjusted time system implementation.
119  template<class time_rep>
120  class counted_time_system
121  {
122   public:
123    typedef time_rep time_rep_type;
124    typedef typename time_rep_type::impl_type impl_type;
125    typedef typename time_rep_type::time_duration_type time_duration_type;
126    typedef typename time_duration_type::fractional_seconds_type fractional_seconds_type;
127    typedef typename time_rep_type::date_type date_type;
128    typedef typename time_rep_type::date_duration_type date_duration_type;
129
130
131    template<class T> static void unused_var(const T&) {}
132
133    static time_rep_type get_time_rep(const date_type& day,
134                                      const time_duration_type& tod,
135                                      date_time::dst_flags dst=not_dst)
136    {
137      unused_var(dst);
138      return time_rep_type(day, tod);
139    }
140
141    static time_rep_type get_time_rep(special_values sv)
142    {
143      switch (sv) {
144      case not_a_date_time:
145        return time_rep_type(date_type(not_a_date_time),
146                             time_duration_type(not_a_date_time));
147      case pos_infin:
148        return time_rep_type(date_type(pos_infin), 
149                             time_duration_type(pos_infin));
150      case neg_infin:
151        return time_rep_type(date_type(neg_infin), 
152                             time_duration_type(neg_infin));
153      case max_date_time: {
154        time_duration_type td = time_duration_type(24,0,0,0) - time_duration_type(0,0,0,1);
155        return time_rep_type(date_type(max_date_time), td);
156      }
157      case min_date_time:
158        return time_rep_type(date_type(min_date_time), time_duration_type(0,0,0,0));
159
160      default:
161        return time_rep_type(date_type(not_a_date_time),
162                             time_duration_type(not_a_date_time));
163        
164      }
165
166    }
167
168    static date_type get_date(const time_rep_type& val)
169    {
170      return val.date();
171    }
172    static time_duration_type get_time_of_day(const time_rep_type& val)
173    {
174      if(val.is_special()) {
175        return time_duration_type(val.get_rep().as_special());
176      }
177      else{
178        return time_duration_type(0,0,0,val.tod()); 
179      }
180    }
181    static std::string zone_name(const time_rep_type&)
182    {
183      return "";
184    }
185    static bool is_equal(const time_rep_type& lhs, const time_rep_type& rhs)
186    {
187      return (lhs.time_count() == rhs.time_count());
188    }
189    static bool is_less(const time_rep_type& lhs, const time_rep_type& rhs)
190    {
191      return (lhs.time_count() < rhs.time_count());
192    }
193    static time_rep_type add_days(const time_rep_type& base,
194                                  const date_duration_type& dd)
195    {
196      if(base.is_special() || dd.is_special()) {
197        return(time_rep_type(base.get_rep() + dd.get_rep()));
198      }
199      else {
200        return time_rep_type(base.time_count() + (dd.days() * time_rep_type::frac_sec_per_day()));
201      }
202    }
203    static time_rep_type subtract_days(const time_rep_type& base,
204                                       const date_duration_type& dd)
205    {
206      if(base.is_special() || dd.is_special()) {
207        return(time_rep_type(base.get_rep() - dd.get_rep()));
208      }
209      else{
210        return time_rep_type(base.time_count() - (dd.days() * time_rep_type::frac_sec_per_day()));
211      }
212    }
213    static time_rep_type subtract_time_duration(const time_rep_type& base,
214                                                const time_duration_type& td)
215    {
216      if(base.is_special() || td.is_special()) {
217        return(time_rep_type(base.get_rep() - td.get_rep()));
218      }
219      else {
220        return time_rep_type(base.time_count() - td.ticks());
221      }
222    }
223    static time_rep_type add_time_duration(const time_rep_type& base,
224                                           time_duration_type td)
225    {
226      if(base.is_special() || td.is_special()) {
227        return(time_rep_type(base.get_rep() + td.get_rep()));
228      }
229      else {
230        return time_rep_type(base.time_count() + td.ticks());
231      }
232    }
233    static time_duration_type subtract_times(const time_rep_type& lhs,
234                                             const time_rep_type& rhs)
235    {
236      if(lhs.is_special() || rhs.is_special()) {
237        return(time_duration_type(
238          impl_type::to_special((lhs.get_rep() - rhs.get_rep()).as_number())));
239      }
240      else {
241        fractional_seconds_type fs = lhs.time_count() - rhs.time_count();
242        return time_duration_type(0,0,0,fs); 
243      }
244    }
245    
246  };
247
248
249} } //namespace date_time
250
251
252
253#endif
254