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 | |
255 | |