

#ifndef BOOST_MPL_STABLE_PARTITION_HPP_INCLUDED

#define BOOST_MPL_STABLE_PARTITION_HPP_INCLUDED



// Copyright Eric Friedman 2002-2003

// Copyright Aleksey Gurtovoy 2004

//

// 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.



// $Source$

// $Date: 2004-11-27 20:58:27 -0500 (Sat, 27 Nov 2004) $

// $Revision: 26325 $



#include <boost/mpl/fold.hpp>

#include <boost/mpl/reverse_fold.hpp>

#include <boost/mpl/protect.hpp>

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

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

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



namespace boost { namespace mpl {



namespace aux {

 

template <

      typename Sequence

    , typename Pred

    , typename In

    , typename In2

    , typename In1 = typename if_na<In,In2>::type

    >

struct stable_partition_impl

    : fold<

          Sequence

        , pair< typename In1::state, typename In2::state >

        , protect< partition_op< 

              Pred

            , typename In1::operation

            , typename In2::operation

            > >

        >

{

};



template <

      typename Sequence

    , typename Pred

    , typename In

    , typename In2

    , typename In1 = typename if_na<In,In2>::type

    >

struct reverse_stable_partition_impl

    : reverse_fold<

          Sequence

        , pair< typename In1::state, typename In2::state >

        , protect< partition_op< 

              Pred

            , typename In1::operation

            , typename In2::operation

            > >

        >

{

};



} // namespace aux



BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(4, stable_partition)



}}



#endif // BOOST_MPL_STABLE_PARTITION_HPP_INCLUDED

