[1022] | 1 | #ifndef DATE_ITERATOR_HPP___ |
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| 2 | #define DATE_ITERATOR_HPP___ |
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| 3 | |
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| 4 | /* Copyright (c) 2002,2003 CrystalClear Software, Inc. |
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| 5 | * Use, modification and distribution is subject to the |
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| 6 | * Boost Software License, Version 1.0. (See accompanying |
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| 7 | * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | * Author: Jeff Garland, Bart Garst |
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| 9 | * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ |
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| 10 | */ |
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| 11 | |
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| 12 | #include <iterator> |
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| 13 | |
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| 14 | namespace boost { |
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| 15 | namespace date_time { |
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| 16 | //! An iterator over dates with varying resolution (day, week, month, year, etc) |
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| 17 | enum date_resolutions {day, week, months, year, decade, century, NumDateResolutions}; |
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| 18 | |
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| 19 | //! Base date iterator type |
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| 20 | /*! This class provides the skeleton for the creation of iterators. |
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| 21 | * New and interesting interators can be created by plugging in a new |
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| 22 | * function that derives the next value from the current state. |
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| 23 | * generation of various types of -based information. |
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| 24 | * |
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| 25 | * <b>Template Parameters</b> |
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| 26 | * |
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| 27 | * <b>date_type</b> |
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| 28 | * |
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| 29 | * The date_type is a concrete date_type. The date_type must |
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| 30 | * define a duration_type and a calendar_type. |
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| 31 | */ |
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| 32 | template<class date_type> |
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| 33 | class date_itr_base { |
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| 34 | // works, but benefit unclear at the moment |
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| 35 | // class date_itr_base : public std::iterator<std::input_iterator_tag, |
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| 36 | // date_type, void, void, void>{ |
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| 37 | public: |
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| 38 | typedef typename date_type::duration_type duration_type; |
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| 39 | typedef date_type value_type; |
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| 40 | typedef std::input_iterator_tag iterator_category; |
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| 41 | |
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| 42 | date_itr_base(date_type d) : current_(d) {} |
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| 43 | virtual ~date_itr_base() {}; |
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| 44 | date_itr_base& operator++() |
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| 45 | { |
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| 46 | current_ = current_ + get_offset(current_); |
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| 47 | return *this; |
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| 48 | } |
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| 49 | date_itr_base& operator--() |
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| 50 | { |
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| 51 | current_ = current_ + get_neg_offset(current_); |
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| 52 | return *this; |
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| 53 | } |
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| 54 | virtual duration_type get_offset(const date_type& current) const=0; |
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| 55 | virtual duration_type get_neg_offset(const date_type& current) const=0; |
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| 56 | date_type operator*() {return current_;}; |
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| 57 | date_type* operator->() {return ¤t_;}; |
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| 58 | bool operator< (const date_type& d) {return current_ < d;} |
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| 59 | bool operator<= (const date_type& d) {return current_ <= d;} |
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| 60 | bool operator> (const date_type& d) {return current_ > d;} |
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| 61 | bool operator>= (const date_type& d) {return current_ >= d;} |
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| 62 | bool operator== (const date_type& d) {return current_ == d;} |
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| 63 | bool operator!= (const date_type& d) {return current_ != d;} |
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| 64 | private: |
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| 65 | date_type current_; |
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| 66 | }; |
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| 67 | |
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| 68 | //! Overrides the base date iterator providing hook for functors |
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| 69 | /* |
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| 70 | * <b>offset_functor</b> |
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| 71 | * |
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| 72 | * The offset functor must define a get_offset function that takes the |
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| 73 | * current point in time and calculates and offset. |
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| 74 | * |
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| 75 | */ |
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| 76 | template<class offset_functor, class date_type> |
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| 77 | class date_itr : public date_itr_base<date_type> { |
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| 78 | public: |
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| 79 | typedef typename date_type::duration_type duration_type; |
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| 80 | date_itr(date_type d, int factor=1) : |
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| 81 | date_itr_base<date_type>(d), |
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| 82 | of_(factor) |
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| 83 | {} |
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| 84 | private: |
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| 85 | virtual duration_type get_offset(const date_type& current) const |
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| 86 | { |
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| 87 | return of_.get_offset(current); |
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| 88 | } |
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| 89 | virtual duration_type get_neg_offset(const date_type& current) const |
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| 90 | { |
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| 91 | return of_.get_neg_offset(current); |
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| 92 | } |
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| 93 | offset_functor of_; |
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| 94 | }; |
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| 95 | |
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| 96 | |
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| 97 | |
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| 98 | } } //namespace date_time |
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| 99 | |
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| 100 | |
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| 101 | #endif |
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