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+/*=============================================================================
+    Copyright (c) 2001-2011 Joel de Guzman
+
+    Distributed under the Boost Software License, Version 1.0. (See accompanying 
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#if !defined(FUSION_CATEGORY_OF_07202005_0308)
+#define FUSION_CATEGORY_OF_07202005_0308
+
+#include <boost/fusion/support/config.hpp>
+#include <boost/fusion/support/detail/category_of.hpp>
+#include <boost/fusion/support/tag_of.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+
+namespace boost { namespace fusion
+{
+    // Special tags:
+    struct boost_tuple_tag; // boost::tuples::tuple tag
+    struct boost_array_tag; // boost::array tag
+    struct mpl_sequence_tag; // mpl sequence tag
+    struct std_pair_tag; // std::pair tag
+
+    struct incrementable_traversal_tag {};
+
+    struct single_pass_traversal_tag
+        : incrementable_traversal_tag {};
+
+    struct forward_traversal_tag
+        : single_pass_traversal_tag {};
+
+    struct bidirectional_traversal_tag
+        : forward_traversal_tag {};
+
+    struct random_access_traversal_tag
+        : bidirectional_traversal_tag {};
+
+    struct associative_tag {};
+
+    struct unbounded_tag {};
+
+    namespace extension
+    {
+        template<typename Tag>
+        struct category_of_impl
+        {
+            template<typename T>
+            struct apply : detail::fusion_category_of<T> {};
+        };
+
+        template <>
+        struct category_of_impl<boost_tuple_tag>;
+
+        template <>
+        struct category_of_impl<boost_array_tag>;
+
+        template <>
+        struct category_of_impl<mpl_sequence_tag>;
+
+        template <>
+        struct category_of_impl<std_pair_tag>;
+    }
+
+    namespace traits
+    {
+        template <typename T>
+        struct category_of
+            : extension::category_of_impl<typename fusion::detail::tag_of<T>::type>::
+                template apply<T>
+        {};
+
+        template <typename T>
+        struct is_associative
+            : is_base_of<
+                associative_tag
+              , typename category_of<T>::type>
+        {};
+
+        template <typename T>
+        struct is_incrementable
+            : is_base_of<
+                incrementable_traversal_tag
+              , typename category_of<T>::type>
+        {};
+
+        template <typename T>
+        struct is_single_pass
+            : is_base_of<
+                single_pass_traversal_tag
+              , typename category_of<T>::type>
+        {};
+
+        template <typename T>
+        struct is_forward
+            : is_base_of<
+                forward_traversal_tag
+              , typename category_of<T>::type>
+        {};
+
+        template <typename T>
+        struct is_bidirectional
+            : is_base_of<
+                bidirectional_traversal_tag
+              , typename category_of<T>::type>
+        {};
+
+        template <typename T>
+        struct is_random_access
+            : is_base_of<
+                random_access_traversal_tag
+              , typename category_of<T>::type>
+        {};
+
+        template <typename T>
+        struct is_unbounded
+            : is_base_of<
+                unbounded_tag
+              , typename category_of<T>::type>
+        {};
+    }
+}}
+
+#endif