#ifndef BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED

#define BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED

// Copyright Aleksey Gurtovoy 2000-2004

//

// 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: /cvsroot/boost/boost/boost/mpl/aux_/push_back_impl.hpp,v $

// $Date: 2004/09/02 15:40:44 $

// $Revision: 1.4 $

#include <boost/mpl/push_back_fwd.hpp>

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

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

#include <boost/mpl/aux_/config/forwarding.hpp>

#include <boost/mpl/aux_/config/static_constant.hpp>

namespace boost { namespace mpl {

// agurt 05/feb/04: no default implementation; the stub definition is needed 

// to enable the default 'has_push_back' implementation below

template< typename Tag >

struct push_back_impl

{

    template< typename Sequence, typename T > struct apply {};

};

template< typename Tag >

struct has_push_back_impl

{

    template< typename Seq > struct apply

#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)

        : aux::has_type< push_back<Seq,int> >

    {

#else

    {

        typedef aux::has_type< push_back<Seq,int> > type;

        BOOST_STATIC_CONSTANT(bool, value = 

              (aux::has_type< push_back<Seq,int> >::value)

            );

#endif

    };

};

BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_back_impl)

BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_back_impl)

}}

#endif // BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED