76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
/* 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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#include <string>
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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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*@tparam 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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