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    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
#if !defined(FUSION_HAS_KEY_10022005_1617)
#define FUSION_HAS_KEY_10022005_1617

#include <boost/fusion/support/config.hpp>
#include <boost/mpl/has_key.hpp>
#include <boost/fusion/sequence/intrinsic/has_key.hpp>

namespace boost { namespace mpl
    template <typename Tag>
    struct has_key_impl;

    template <>
    struct has_key_impl<fusion::fusion_sequence_tag>
        template <typename Sequence, typename Key>
        struct apply : fusion::result_of::has_key<Sequence, Key> {};