changes is_convertible<category_of... to is_<concept>

[SVN r37231]

include/boost/fusion/functional/invocation/invoke.hpp

@@ -82,10 +82,7 @@ namespace boost { namespace fusion
             int N = result_of::size<Sequence>::value,
             bool CBI = ft::is_callable_builtin<Function>::value,
             bool MFP = ft::is_member_function_pointer<Function>::value, 
-            bool RandomAccess = boost::is_convertible< 
-                    typename traits::category_of<Sequence>::type,
-                    fusion::random_access_traversal_tag 
-                >::value 
+            bool RandomAccess = traits::is_random_access<Sequence>::value
             >
         struct invoke_impl
         {