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 | |
12 | namespace boost { |
13 | namespace 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 | |