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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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