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    Copyright (c) 2007 Tobias Schwinger

    Distributed under the Boost Software License, Version 1.0. (See accompanying 
    file LICENSE_1_0.txt or copy at

#include <boost/type_traits/is_convertible.hpp>

namespace boost { namespace fusion
    struct cons_tag;

    struct nil;

    template <typename Car, typename Cdr>
    struct cons;

    namespace extension
        template <typename Tag>
        struct empty_impl;

        template <>
        struct empty_impl<cons_tag>
            template <typename Sequence>
            struct apply
                : boost::is_convertible<Sequence, nil>