source: trunk/yat/utility/WeightedIterator.h @ 1531

Last change on this file since 1531 was 1531, checked in by Peter, 13 years ago

working on WeightedIterator? refs #368

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1#ifndef _theplu_yat_utility_weighted_iterator_
2#define _theplu_yat_utility_weighted_iterator_
3
4// $Id: WeightedIterator.h 1531 2008-09-24 21:47:41Z peter $
5
6/*
7  Copyright (C) 2008 Peter Johansson
8
9  This file is part of the yat library, http://dev.thep.lu.se/yat
10
11  The yat library is free software; you can redistribute it and/or
12  modify it under the terms of the GNU General Public License as
13  published by the Free Software Foundation; either version 3 of the
14  License, or (at your option) any later version.
15
16  The yat library is distributed in the hope that it will be useful,
17  but WITHOUT ANY WARRANTY; without even the implied warranty of
18  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  General Public License for more details.
20
21  You should have received a copy of the GNU General Public License
22  along with yat. If not, see <http://www.gnu.org/licenses/>.
23*/
24
25#include <boost/iterator/iterator_facade.hpp>
26
27namespace theplu {
28namespace yat {
29namespace utility {
30
31  /**
32     @brief WeightedIterator
33  */
34  template<typename DataIterator, typename WeightIterator>
35  class WeightedIterator
36    : public boost::iterator_facade<
37    WeightedIterator<DataIterator, WeightIterator>,
38    DataWeight,
39    std::random_access_iterator_tag,
40    DataWeight>
41   
42  {
43  public:
44    /**
45       \brief Constructor
46     */
47    WeightedIterator(DataIterator d, WeightIterator w)
48      : d_iter_(d), w_iter_(w)
49    {}
50
51    /**
52       \brief Conversion constructor.
53
54       Create a WeightIterator<Base> from a
55       WeightIterator<B2>. Possible if B2 is convertible to a
56       Base. Constructor allows implicit conversions such as iterator
57       to const_iterator.
58     */
59    /*
60    template<typename D2, typename W2>
61    WeightedIterator(WeightedIterator<D2, W2> other,
62            typename boost::enable_if_convertible<D2,DataIterator>::type* = 0,
63            typename boost::enable_if_convertible<W2,WeightIterator>::type* = 0)
64    {}
65    */
66
67  private:
68    friend class boost::iterator_core_access;
69
70    DataIterator d_iter_;
71    WeightIterator w_iter_;
72
73    DataWeight dereference(void) const 
74    { return DataWeight(*d_iter_, *w_iter_); }
75
76    void increment(void) { ++d_iter_; ++w_iter_; }
77
78  };
79
80  /**
81     \brief convenient function to create WeightedIterator
82
83     Convenient function in same fashion as std::make_pair.
84   */
85  template<typename DataIterator, typename WeightIterator>
86  WeightedIterator<DataIterator, WeightIterator> 
87  weighted_iterator(DataIterator data, WeightIterator weight)
88  {
89    return WeightedIterator<DataIterator, WeightIterator>(data, weight);
90  }
91 
92
93
94}}} // of namespace utility, yat, and theplu
95
96#endif
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