| #ifndef DATE_ITERATOR_HPP___ |
| #define DATE_ITERATOR_HPP___ |
| |
| /* Copyright (c) 2002,2003 CrystalClear Software, Inc. |
| * Use, modification and distribution is subject to the |
| * Boost Software License, Version 1.0. (See accompanying |
| * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
| * Author: Jeff Garland, Bart Garst |
| * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ |
| */ |
| |
| #include <iterator> |
| |
| namespace boost { |
| namespace date_time { |
| //! An iterator over dates with varying resolution (day, week, month, year, etc) |
| enum date_resolutions {day, week, months, year, decade, century, NumDateResolutions}; |
| |
| //! Base date iterator type |
| /*! This class provides the skeleton for the creation of iterators. |
| * New and interesting interators can be created by plugging in a new |
| * function that derives the next value from the current state. |
| * generation of various types of -based information. |
| * |
| * <b>Template Parameters</b> |
| * |
| * <b>date_type</b> |
| * |
| * The date_type is a concrete date_type. The date_type must |
| * define a duration_type and a calendar_type. |
| */ |
| template<class date_type> |
| class date_itr_base { |
| // works, but benefit unclear at the moment |
| // class date_itr_base : public std::iterator<std::input_iterator_tag, |
| // date_type, void, void, void>{ |
| public: |
| typedef typename date_type::duration_type duration_type; |
| typedef date_type value_type; |
| typedef std::input_iterator_tag iterator_category; |
| |
| date_itr_base(date_type d) : current_(d) {} |
| virtual ~date_itr_base() {}; |
| date_itr_base& operator++() |
| { |
| current_ = current_ + get_offset(current_); |
| return *this; |
| } |
| date_itr_base& operator--() |
| { |
| current_ = current_ + get_neg_offset(current_); |
| return *this; |
| } |
| virtual duration_type get_offset(const date_type& current) const=0; |
| virtual duration_type get_neg_offset(const date_type& current) const=0; |
| date_type operator*() {return current_;}; |
| date_type* operator->() {return ¤t_;}; |
| bool operator< (const date_type& d) {return current_ < d;} |
| bool operator<= (const date_type& d) {return current_ <= d;} |
| bool operator> (const date_type& d) {return current_ > d;} |
| bool operator>= (const date_type& d) {return current_ >= d;} |
| bool operator== (const date_type& d) {return current_ == d;} |
| bool operator!= (const date_type& d) {return current_ != d;} |
| private: |
| date_type current_; |
| }; |
| |
| //! Overrides the base date iterator providing hook for functors |
| /* |
| * <b>offset_functor</b> |
| * |
| * The offset functor must define a get_offset function that takes the |
| * current point in time and calculates and offset. |
| * |
| */ |
| template<class offset_functor, class date_type> |
| class date_itr : public date_itr_base<date_type> { |
| public: |
| typedef typename date_type::duration_type duration_type; |
| date_itr(date_type d, int factor=1) : |
| date_itr_base<date_type>(d), |
| of_(factor) |
| {} |
| private: |
| virtual duration_type get_offset(const date_type& current) const |
| { |
| return of_.get_offset(current); |
| } |
| virtual duration_type get_neg_offset(const date_type& current) const |
| { |
| return of_.get_neg_offset(current); |
| } |
| offset_functor of_; |
| }; |
| |
| |
| |
| } } //namespace date_time |
| |
| |
| #endif |