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