/*=============================================================================
    Copyright (c) 2009 Christopher Schmidt

    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)
==============================================================================*/

#ifndef BOOST_FUSION_ITERATOR_KEY_OF_HPP
#define BOOST_FUSION_ITERATOR_KEY_OF_HPP

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

namespace boost {
namespace fusion {
struct iterator_facade_tag;

namespace extension {
template <typename>
struct key_of_impl;

template <>
struct key_of_impl<iterator_facade_tag>
{
    template <typename It>
    struct apply
        : It::template key_of<It>
    {};
};
}

namespace result_of {
template <typename It>
struct key_of
    : extension::key_of_impl<typename traits::tag_of<It>::type>::
      template apply<It>
{};
}
}
}

#endif
