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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 | ||
24 | namespace boost { namespace fusion { namespace detail | |
25 | { | |
26 | ||
27 | template<class Category> | |
28 | struct 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 | ||
42 | namespace 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 |