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 * $Date$
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 = static_cast<typename calendar_type::date_int_type>(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
255

source code of boost/boost/date_time/time_system_counted.hpp