Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
Chris@16: 
Chris@16:     Distributed under the Boost Software License, Version 1.0. (See accompanying 
Chris@16:     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: ==============================================================================*/
Chris@16: #if !defined(FUSION_VALUE_OF_05052005_1126)
Chris@16: #define FUSION_VALUE_OF_05052005_1126
Chris@16: 
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <boost/fusion/support/iterator_base.hpp>
Chris@16: #include <boost/fusion/support/tag_of.hpp>
Chris@16: 
Chris@16: namespace boost { namespace fusion
Chris@16: {
Chris@16:     // Special tags:
Chris@16:     struct iterator_facade_tag; // iterator facade tag
Chris@16:     struct boost_array_iterator_tag; // boost::array iterator tag
Chris@16:     struct mpl_iterator_tag; // mpl sequence iterator tag
Chris@16:     struct std_pair_iterator_tag; // std::pair iterator tag
Chris@16: 
Chris@16:     namespace extension
Chris@16:     {
Chris@16:         template <typename Tag>
Chris@16:         struct value_of_impl
Chris@16:         {
Chris@16:             template <typename Iterator>
Chris@16:             struct apply {};
Chris@16:         };
Chris@16: 
Chris@16:         template <>
Chris@16:         struct value_of_impl<iterator_facade_tag>
Chris@16:         {
Chris@16:             template <typename Iterator>
Chris@16:             struct apply : Iterator::template value_of<Iterator> {};
Chris@16:         };
Chris@16: 
Chris@16:         template <>
Chris@16:         struct value_of_impl<boost_array_iterator_tag>;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct value_of_impl<mpl_iterator_tag>;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct value_of_impl<std_pair_iterator_tag>;
Chris@16:     }
Chris@16: 
Chris@16:     namespace result_of
Chris@16:     {
Chris@16:         template <typename Iterator>
Chris@16:         struct value_of
Chris@16:             : extension::value_of_impl<typename detail::tag_of<Iterator>::type>::
Chris@16:                 template apply<Iterator>
Chris@16:         {};
Chris@16:     }
Chris@16: }}
Chris@16: 
Chris@16: #endif