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1 | // Boost.Range library |
2 | // | |
3 | // Copyright Neil Groves 2009. Use, modification and | |
4 | // distribution is subject to the Boost Software License, Version | |
5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | // | |
8 | // Acknowledgements: | |
9 | // aschoedl supplied a fix to supply the level of interoperability I had | |
10 | // originally intended, but failed to implement. | |
11 | // | |
12 | // For more information, see http://www.boost.org/libs/range/ | |
13 | // | |
14 | #ifndef BOOST_RANGE_DETAIL_DEMOTE_ITERATOR_TRAVERSAL_TAG_HPP_INCLUDED | |
15 | #define BOOST_RANGE_DETAIL_DEMOTE_ITERATOR_TRAVERSAL_TAG_HPP_INCLUDED | |
16 | ||
17 | #include <boost/iterator/iterator_categories.hpp> | |
18 | ||
19 | namespace boost | |
20 | { | |
21 | namespace range_detail | |
22 | { | |
23 | ||
24 | template<class IteratorTraversalTag1, class IteratorTraversalTag2> | |
25 | struct inner_demote_iterator_traversal_tag | |
26 | { | |
27 | }; | |
28 | ||
29 | #define BOOST_DEMOTE_TRAVERSAL_TAG( Tag1, Tag2, ResultTag ) \ | |
30 | template<> struct inner_demote_iterator_traversal_tag< Tag1 , Tag2 > \ | |
31 | { \ | |
32 | typedef ResultTag type; \ | |
33 | }; | |
34 | ||
35 | BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, no_traversal_tag, no_traversal_tag ) | |
36 | BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, incrementable_traversal_tag, no_traversal_tag ) | |
37 | BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, single_pass_traversal_tag, no_traversal_tag ) | |
38 | BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, forward_traversal_tag, no_traversal_tag ) | |
39 | BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, bidirectional_traversal_tag, no_traversal_tag ) | |
40 | BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, random_access_traversal_tag, no_traversal_tag ) | |
41 | ||
42 | BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, no_traversal_tag, no_traversal_tag ) | |
43 | BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag ) | |
44 | BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, single_pass_traversal_tag, incrementable_traversal_tag ) | |
45 | BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, forward_traversal_tag, incrementable_traversal_tag ) | |
46 | BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, bidirectional_traversal_tag, incrementable_traversal_tag ) | |
47 | BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, random_access_traversal_tag, incrementable_traversal_tag ) | |
48 | ||
49 | BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, no_traversal_tag, no_traversal_tag ) | |
50 | BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag ) | |
51 | BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag ) | |
52 | BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, forward_traversal_tag, single_pass_traversal_tag ) | |
53 | BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, bidirectional_traversal_tag, single_pass_traversal_tag ) | |
54 | BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, random_access_traversal_tag, single_pass_traversal_tag ) | |
55 | ||
56 | BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, no_traversal_tag, no_traversal_tag ) | |
57 | BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag ) | |
58 | BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag ) | |
59 | BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, forward_traversal_tag, forward_traversal_tag ) | |
60 | BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, bidirectional_traversal_tag, forward_traversal_tag ) | |
61 | BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, random_access_traversal_tag, forward_traversal_tag ) | |
62 | ||
63 | BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, no_traversal_tag, no_traversal_tag ) | |
64 | BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag ) | |
65 | BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag ) | |
66 | BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, forward_traversal_tag, forward_traversal_tag ) | |
67 | BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, bidirectional_traversal_tag, bidirectional_traversal_tag ) | |
68 | BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, random_access_traversal_tag, bidirectional_traversal_tag ) | |
69 | ||
70 | BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, no_traversal_tag, no_traversal_tag ) | |
71 | BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag ) | |
72 | BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag ) | |
73 | BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, forward_traversal_tag, forward_traversal_tag ) | |
74 | BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, bidirectional_traversal_tag, bidirectional_traversal_tag ) | |
75 | BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, random_access_traversal_tag, random_access_traversal_tag ) | |
76 | ||
77 | #undef BOOST_DEMOTE_TRAVERSAL_TAG | |
78 | ||
79 | template<class IteratorTraversalTag1, class IteratorTraversalTag2> | |
80 | struct demote_iterator_traversal_tag | |
81 | : inner_demote_iterator_traversal_tag< | |
82 | typename boost::iterators::pure_traversal_tag< IteratorTraversalTag1 >::type, | |
83 | typename boost::iterators::pure_traversal_tag< IteratorTraversalTag2 >::type | |
84 | > | |
85 | { | |
86 | }; | |
87 | ||
88 | } // namespace range_detail | |
89 | } // namespace boost | |
90 | ||
91 | #endif // include guard |