1 /*=============================================================================
2 Copyright (c) 2001-2006 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/detail/category_of.hpp>
11 #include <boost/fusion/support/tag_of.hpp>
12 #include <boost/type_traits/is_base_of.hpp>
14 namespace boost { namespace fusion
17 struct boost_tuple_tag; // boost::tuples::tuple tag
18 struct boost_array_tag; // boost::array tag
19 struct mpl_sequence_tag; // mpl sequence tag
20 struct std_pair_tag; // std::pair tag
22 struct incrementable_traversal_tag {};
24 struct single_pass_traversal_tag
25 : incrementable_traversal_tag {};
27 struct forward_traversal_tag
28 : single_pass_traversal_tag {};
30 struct bidirectional_traversal_tag
31 : forward_traversal_tag {};
33 struct random_access_traversal_tag
34 : bidirectional_traversal_tag {};
36 struct associative_tag {};
40 template<typename Tag>
41 struct category_of_impl
44 struct apply : detail::fusion_category_of<T> {};
48 struct category_of_impl<boost_tuple_tag>;
51 struct category_of_impl<boost_array_tag>;
54 struct category_of_impl<mpl_sequence_tag>;
57 struct category_of_impl<std_pair_tag>;
64 : extension::category_of_impl<typename fusion::detail::tag_of<T>::type>::
72 , typename category_of<T>::type>
76 struct is_incrementable
78 incrementable_traversal_tag
79 , typename category_of<T>::type>
85 single_pass_traversal_tag
86 , typename category_of<T>::type>
93 , typename category_of<T>::type>
97 struct is_bidirectional
99 bidirectional_traversal_tag
100 , typename category_of<T>::type>
103 template <typename T>
104 struct is_random_access
106 random_access_traversal_tag
107 , typename category_of<T>::type>