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    Copyright (c) 2001-2011 Joel de Guzman
    Copyright (c) 2005-2006 Dan Marsden

    Distributed under the Boost Software License, Version 1.0. (See accompanying 
    file LICENSE_1_0.txt or copy at
#if !defined(BOOST_FUSION_AT_IMPL_31122005_1642)
#define BOOST_FUSION_AT_IMPL_31122005_1642

#include <boost/mpl/at.hpp>

namespace boost { namespace fusion 
    struct mpl_sequence_tag;

    namespace extension
        template<typename Tag>
        struct at_impl;

        template <>
        struct at_impl<mpl_sequence_tag>
            template <typename Sequence, typename N>
            struct apply
                typedef typename mpl::at<Sequence, N>::type type;
                static type
                    return type();