1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6==============================================================================*/
7#if !defined(FUSION_FUSION_ITERATOR_10012005_1551)
8#define FUSION_FUSION_ITERATOR_10012005_1551
9
10#include <boost/fusion/support/config.hpp>
11#include <boost/fusion/iterator/value_of.hpp>
12#include <boost/fusion/iterator/next.hpp>
13#include <boost/fusion/iterator/prior.hpp>
14#include <boost/fusion/iterator/advance.hpp>
15#include <boost/fusion/iterator/distance.hpp>
16#include <boost/fusion/support/category_of.hpp>
17#include <boost/mpl/next_prior.hpp>
18#include <boost/mpl/advance_fwd.hpp>
19#include <boost/mpl/distance_fwd.hpp>
20#include <boost/mpl/iterator_tags.hpp>
21#include <boost/mpl/eval_if.hpp>
22#include <boost/type_traits/is_base_of.hpp>
23
24namespace boost { namespace fusion { namespace detail
25{
26
27template<class Category>
28struct to_mpl_category {
29 typedef typename mpl::eval_if<
30 is_base_of<random_access_traversal_tag, Category>,
31 mpl::random_access_iterator_tag,
32 mpl::eval_if<
33 is_base_of<bidirectional_traversal_tag, Category>,
34 mpl::bidirectional_iterator_tag,
35 mpl::forward_iterator_tag
36 >
37 >::type type;
38};
39
40}}}
41
42namespace boost { namespace mpl
43{
44 template <typename Iterator>
45 struct fusion_iterator
46 {
47 typedef typename fusion::result_of::value_of<Iterator>::type type;
48 typedef typename fusion::traits::category_of<Iterator>::type fusion_category;
49 typedef typename fusion::detail::to_mpl_category<fusion_category>::type category;
50 typedef Iterator iterator;
51 };
52
53 template <typename Iterator>
54 struct next<fusion_iterator<Iterator> >
55 {
56 typedef fusion_iterator<typename fusion::result_of::next<Iterator>::type> type;
57 };
58
59 template <typename Iterator>
60 struct prior<fusion_iterator<Iterator> >
61 {
62 typedef fusion_iterator<typename fusion::result_of::prior<Iterator>::type> type;
63 };
64
65 template <typename Iterator, typename N>
66 struct advance<fusion_iterator<Iterator>, N>
67 {
68 typedef fusion_iterator<typename fusion::result_of::advance<Iterator, N>::type> type;
69 };
70
71 template <typename First, typename Last>
72 struct distance<fusion_iterator<First>, fusion_iterator<Last> >
73 : fusion::result_of::distance<First, Last>
74 {};
75
76}}
77
78#endif
79
80
81

source code of include/boost/fusion/iterator/mpl/fusion_iterator.hpp