1/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
2 * Use, modification and distribution is subject to the
3 * Boost Software License, Version 1.0. (See accompanying
4 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
5 * Author: Jeff Garland, Bart Garst
6 */
7#ifndef DATE_TIME_DATE_DST_TRANSITION_DAY_GEN_HPP__
8#define DATE_TIME_DATE_DST_TRANSITION_DAY_GEN_HPP__
9
10
11
12namespace boost {
13namespace date_time {
14
15 //! Defines base interface for calculating start and end date of daylight savings
16 template<class date_type>
17 class dst_day_calc_rule
18 {
19 public:
20 typedef typename date_type::year_type year_type;
21 virtual ~dst_day_calc_rule() {}
22 virtual date_type start_day(year_type y) const=0;
23 virtual std::string start_rule_as_string() const=0;
24 virtual date_type end_day(year_type y) const=0;
25 virtual std::string end_rule_as_string() const=0;
26
27 };
28
29 //! Canonical form for a class that provides day rule calculation
30 /*! This class is used to generate specific sets of dst rules
31 *
32 *@param spec Provides a specifiction of the function object types used
33 * to generate start and end days of daylight savings as well
34 * as the date type.
35 */
36 template<class spec>
37 class day_calc_dst_rule : public dst_day_calc_rule<typename spec::date_type>
38 {
39 public:
40 typedef typename spec::date_type date_type;
41 typedef typename date_type::year_type year_type;
42 typedef typename spec::start_rule start_rule;
43 typedef typename spec::end_rule end_rule;
44 day_calc_dst_rule(start_rule dst_start,
45 end_rule dst_end) :
46 dst_start_(dst_start),
47 dst_end_(dst_end)
48 {}
49 virtual date_type start_day(year_type y) const
50 {
51 return dst_start_.get_date(y);
52 }
53 virtual std::string start_rule_as_string() const
54 {
55 return dst_start_.to_string();
56 }
57 virtual date_type end_day(year_type y) const
58 {
59 return dst_end_.get_date(y);
60 }
61 virtual std::string end_rule_as_string() const
62 {
63 return dst_end_.to_string();
64 }
65 private:
66 start_rule dst_start_;
67 end_rule dst_end_;
68 };
69
70
71} }//namespace
72
73
74
75#endif
76

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