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    Copyright (c) 2001-2011 Joel de Guzman
    Copyright (c) 2007 Tobias Schwinger

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at
#if !defined(FUSION_SEQUENCE_BASE_04182005_0737)
#define FUSION_SEQUENCE_BASE_04182005_0737

#include <boost/mpl/begin_end_fwd.hpp>

namespace boost { namespace fusion
    namespace detail
        struct from_sequence_convertible_type

    template <typename Sequence>
    struct sequence_base
        Sequence const&
        derived() const
            return static_cast<Sequence const&>(*this);

            return static_cast<Sequence&>(*this);

        operator detail::from_sequence_convertible_type()const
            return detail::from_sequence_convertible_type();

    struct fusion_sequence_tag;

namespace boost { namespace mpl
    // Deliberately break mpl::begin, so it doesn't lie that a Fusion sequence
    // is not an MPL sequence by returning mpl::void_.
    // In other words: Fusion Sequences are always MPL Sequences, but they can
    // be incompletely defined.
    template<> struct begin_impl< boost::fusion::fusion_sequence_tag >;