#ifndef BOOST_MPL_FOLD_HPP_INCLUDED

#define BOOST_MPL_FOLD_HPP_INCLUDED

// Copyright Aleksey Gurtovoy 2001-2004

// Copyright David Abrahams 2001-2002

//

// Distributed under the Boost Software License, Version 1.0. 

// (See accompanying file LICENSE_1_0.txt or copy at 

// http://www.boost.org/LICENSE_1_0.txt)

//

// See http://www.boost.org/libs/mpl for documentation.

// $Source: /cvsroot/boost/boost/boost/mpl/fold.hpp,v $

// $Date: 2004/09/02 15:40:41 $

// $Revision: 1.4 $

#include <boost/mpl/begin_end.hpp>

#include <boost/mpl/O1_size.hpp>

#include <boost/mpl/aux_/fold_impl.hpp>

#include <boost/mpl/aux_/na_spec.hpp>

#include <boost/mpl/aux_/lambda_support.hpp>

namespace boost { namespace mpl {

template<

      typename BOOST_MPL_AUX_NA_PARAM(Sequence)

    , typename BOOST_MPL_AUX_NA_PARAM(State)

    , typename BOOST_MPL_AUX_NA_PARAM(ForwardOp)

    >

struct fold

{

    typedef typename aux::fold_impl<

          ::boost::mpl::O1_size<Sequence>::value

        , typename begin<Sequence>::type

        , typename end<Sequence>::type

        , State

        , ForwardOp

        >::state type;

    BOOST_MPL_AUX_LAMBDA_SUPPORT(3,fold,(Sequence,State,ForwardOp))

};

BOOST_MPL_AUX_NA_SPEC(3, fold)

}}

#endif // BOOST_MPL_FOLD_HPP_INCLUDED