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Editing: key_of.hpp

/*=============================================================================
    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

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