#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