/*=============================================================================
    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_VALUE_OF_05052005_1126)
#define FUSION_VALUE_OF_05052005_1126

#include <boost/fusion/support/config.hpp>
#include <boost/fusion/support/iterator_base.hpp>
#include <boost/fusion/support/tag_of.hpp>

namespace boost {
namespace fusion {
// Special tags:
struct iterator_facade_tag; // iterator facade tag
struct boost_array_iterator_tag; // boost::array iterator tag
struct mpl_iterator_tag; // mpl sequence iterator tag
struct std_pair_iterator_tag; // std::pair iterator tag

namespace extension {
template <typename Tag>
struct value_of_impl
{
    template <typename Iterator>
    struct apply {};
};

template <>
struct value_of_impl<iterator_facade_tag>
{
    template <typename Iterator>
    struct apply : Iterator::template value_of<Iterator> {};
};

template <>
struct value_of_impl<boost_array_iterator_tag>;

template <>
struct value_of_impl<mpl_iterator_tag>;

template <>
struct value_of_impl<std_pair_iterator_tag>;
}

namespace result_of {
template <typename Iterator>
struct value_of
    : extension::value_of_impl<typename detail::tag_of<Iterator>::type>::
      template apply<Iterator>
{};
}
}
}

#endif
