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    Copyright (c) 2001-2011 Joel de Guzman
    Copyright (c) 2005 Eric Niebler

    Distributed under the Boost Software License, Version 1.0. (See accompanying 
    file LICENSE_1_0.txt or copy at
#if !defined(FUSION_END_IMPL_07172005_0828)
#define FUSION_END_IMPL_07172005_0828

#include <boost/mpl/if.hpp>
#include <boost/type_traits/is_const.hpp>

namespace boost { namespace fusion
    struct nil;

    struct cons_tag;

    template <typename Car, typename Cdr>
    struct cons;

    template <typename Cons>
    struct cons_iterator;

    namespace extension
        template <typename Tag>
        struct end_impl;

        template <>
        struct end_impl<cons_tag>
            template <typename Sequence>
            struct apply 
                typedef cons_iterator<
                    typename mpl::if_<is_const<Sequence>, nil const, nil>::type>
                static type
                    return type();