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