[857] | 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 or http://www.boost.org/LICENSE-1.0)
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| 8 | * Author: Jeff Garland, Bart Garst
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| 9 | * $Date: 2003/11/23 03:29:56 $
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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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