#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