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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 | ||
18 | namespace boost { | |
19 | namespace 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 |