Chris@16: #ifndef DATE_ITERATOR_HPP___
Chris@16: #define DATE_ITERATOR_HPP___
Chris@16: 
Chris@16: /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
Chris@16:  * Use, modification and distribution is subject to the
Chris@16:  * Boost Software License, Version 1.0. (See accompanying
Chris@16:  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  * Author: Jeff Garland, Bart Garst
Chris@101:  * $Date$
Chris@16:  */
Chris@16: 
Chris@16: #include <iterator>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace date_time {
Chris@16:   //! An iterator over dates with varying resolution (day, week, month, year, etc)
Chris@16:   enum date_resolutions {day, week, months, year, decade, century, NumDateResolutions};
Chris@16: 
Chris@16:   //! Base date iterator type
Chris@16:   /*! This class provides the skeleton for the creation of iterators.
Chris@16:    *  New and interesting interators can be created by plugging in a new
Chris@16:    *  function that derives the next value from the current state.
Chris@16:    *  generation of various types of -based information.
Chris@16:    *
Chris@16:    *  <b>Template Parameters</b>
Chris@16:    *
Chris@16:    *  <b>date_type</b>
Chris@16:    *
Chris@16:    *  The date_type is a concrete date_type. The date_type must
Chris@16:    *  define a duration_type and a calendar_type.
Chris@16:    */
Chris@16:   template<class date_type>
Chris@16:   class date_itr_base {
Chris@16:   // works, but benefit unclear at the moment
Chris@16:   //   class date_itr_base : public std::iterator<std::input_iterator_tag,
Chris@16:   //                                             date_type, void, void, void>{
Chris@16:   public:
Chris@16:     typedef typename date_type::duration_type duration_type;
Chris@16:     typedef date_type value_type;
Chris@16:     typedef std::input_iterator_tag iterator_category;
Chris@16: 
Chris@16:     date_itr_base(date_type d) : current_(d) {}
Chris@16:     virtual ~date_itr_base() {}
Chris@16:     date_itr_base& operator++()
Chris@16:     {
Chris@16:       current_ = current_ + get_offset(current_);
Chris@16:       return *this;
Chris@16:     }
Chris@16:     date_itr_base& operator--()
Chris@16:     {
Chris@16:       current_ = current_ + get_neg_offset(current_);
Chris@16:       return *this;
Chris@16:     }
Chris@16:     virtual duration_type get_offset(const date_type& current) const=0;
Chris@16:     virtual duration_type get_neg_offset(const date_type& current) const=0;
Chris@16:     date_type operator*() {return current_;}
Chris@16:     date_type* operator->() {return &current_;}
Chris@16:     bool operator<  (const date_type& d) {return current_ < d;}
Chris@16:     bool operator<= (const date_type& d) {return current_ <= d;}
Chris@16:     bool operator>  (const date_type& d) {return current_ > d;}
Chris@16:     bool operator>= (const date_type& d) {return current_ >= d;}
Chris@16:     bool operator== (const date_type& d) {return current_ == d;}
Chris@16:     bool operator!= (const date_type& d) {return current_ != d;}
Chris@16:   private:
Chris@16:     date_type current_;
Chris@16:   };
Chris@16: 
Chris@16:   //! Overrides the base date iterator providing hook for functors
Chris@16:   /*
Chris@16:    *  <b>offset_functor</b>
Chris@16:    *
Chris@16:    *  The offset functor must define a get_offset function that takes the
Chris@16:    *  current point in time and calculates and offset.
Chris@16:    *
Chris@16:    */
Chris@16:   template<class offset_functor, class date_type>
Chris@16:   class date_itr : public date_itr_base<date_type> {
Chris@16:   public:
Chris@16:     typedef typename date_type::duration_type duration_type;
Chris@16:     date_itr(date_type d, int factor=1) :
Chris@16:       date_itr_base<date_type>(d),
Chris@16:       of_(factor)
Chris@16:     {}
Chris@16:   private:
Chris@16:     virtual duration_type get_offset(const date_type& current) const
Chris@16:     {
Chris@16:       return of_.get_offset(current);
Chris@16:     }
Chris@16:     virtual duration_type get_neg_offset(const date_type& current) const
Chris@16:     {
Chris@16:       return of_.get_neg_offset(current);
Chris@16:     }
Chris@16:     offset_functor of_;
Chris@16:   };
Chris@16: 
Chris@16: 
Chris@16: 
Chris@16: } } //namespace date_time
Chris@16: 
Chris@16: 
Chris@16: #endif