| /* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc. |
| * Use, modification and distribution is subject to the |
| * Boost Software License, Version 1.0. (See accompanying |
| * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
| * Author: Jeff Garland, Bart Garst |
| */ |
| #ifndef DATE_TIME_DATE_DST_TRANSITION_DAY_GEN_HPP__ |
| #define DATE_TIME_DATE_DST_TRANSITION_DAY_GEN_HPP__ |
| |
| |
| |
| namespace boost { |
| namespace date_time { |
| |
| //! Defines base interface for calculating start and end date of daylight savings |
| template<class date_type> |
| class dst_day_calc_rule |
| { |
| public: |
| typedef typename date_type::year_type year_type; |
| virtual ~dst_day_calc_rule() {}; |
| virtual date_type start_day(year_type y) const=0; |
| virtual std::string start_rule_as_string() const=0; |
| virtual date_type end_day(year_type y) const=0; |
| virtual std::string end_rule_as_string() const=0; |
| |
| }; |
| |
| //! Canonical form for a class that provides day rule calculation |
| /*! This class is used to generate specific sets of dst rules |
| * |
| *@param spec Provides a specifiction of the function object types used |
| * to generate start and end days of daylight savings as well |
| * as the date type. |
| */ |
| template<class spec> |
| class day_calc_dst_rule : public dst_day_calc_rule<typename spec::date_type> |
| { |
| public: |
| typedef typename spec::date_type date_type; |
| typedef typename date_type::year_type year_type; |
| typedef typename spec::start_rule start_rule; |
| typedef typename spec::end_rule end_rule; |
| day_calc_dst_rule(start_rule dst_start, |
| end_rule dst_end) : |
| dst_start_(dst_start), |
| dst_end_(dst_end) |
| {} |
| virtual date_type start_day(year_type y) const |
| { |
| return dst_start_.get_date(y); |
| } |
| virtual std::string start_rule_as_string() const |
| { |
| return dst_start_.to_string(); |
| } |
| virtual date_type end_day(year_type y) const |
| { |
| return dst_end_.get_date(y); |
| } |
| virtual std::string end_rule_as_string() const |
| { |
| return dst_end_.to_string(); |
| } |
| private: |
| start_rule dst_start_; |
| end_rule dst_end_; |
| }; |
| |
| |
| } }//namespace |
| |
| |
| |
| #endif |