1 /*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
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_CATEGORY_OF_07202005_0308)
8 #define FUSION_CATEGORY_OF_07202005_0308
10 #include <boost/fusion/support/config.hpp>
11 #include <boost/fusion/support/detail/category_of.hpp>
12 #include <boost/fusion/support/tag_of.hpp>
13 #include <boost/type_traits/is_base_of.hpp>
15 namespace boost { namespace fusion
18 struct boost_tuple_tag; // boost::tuples::tuple tag
19 struct boost_array_tag; // boost::array tag
20 struct mpl_sequence_tag; // mpl sequence tag
21 struct std_pair_tag; // std::pair tag
23 struct incrementable_traversal_tag {};
25 struct single_pass_traversal_tag
26 : incrementable_traversal_tag {};
28 struct forward_traversal_tag
29 : single_pass_traversal_tag {};
31 struct bidirectional_traversal_tag
32 : forward_traversal_tag {};
34 struct random_access_traversal_tag
35 : bidirectional_traversal_tag {};
37 struct associative_tag {};
39 struct unbounded_tag {};
43 template<typename Tag>
44 struct category_of_impl
47 struct apply : detail::fusion_category_of<T> {};
51 struct category_of_impl<boost_tuple_tag>;
54 struct category_of_impl<boost_array_tag>;
57 struct category_of_impl<mpl_sequence_tag>;
60 struct category_of_impl<std_pair_tag>;
67 : extension::category_of_impl<typename fusion::detail::tag_of<T>::type>::
75 , typename category_of<T>::type>
79 struct is_incrementable
81 incrementable_traversal_tag
82 , typename category_of<T>::type>
88 single_pass_traversal_tag
89 , typename category_of<T>::type>
96 , typename category_of<T>::type>
100 struct is_bidirectional
102 bidirectional_traversal_tag
103 , typename category_of<T>::type>
106 template <typename T>
107 struct is_random_access
109 random_access_traversal_tag
110 , typename category_of<T>::type>
113 template <typename T>
117 , typename category_of<T>::type>