#ifndef BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED

 #define BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED

 // Copyright Aleksey Gurtovoy 2003-2004

 //

 // 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/set/aux_/at_impl.hpp,v $

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

 // $Revision: 1.2 $

 #include <boost/mpl/at_fwd.hpp>

 #include <boost/mpl/set/aux_/has_key_impl.hpp>

 #include <boost/mpl/set/aux_/tag.hpp>

 #include <boost/mpl/if.hpp>

 #include <boost/mpl/void.hpp>

 namespace boost { namespace mpl {

 template<>

 struct at_impl< aux::set_tag >

 {

     template< typename Set, typename T > struct apply

     {

         typedef typename if_< 

               has_key_impl<aux::set_tag>::apply<Set,T>

             , T

             , void_

             >::type type;            

     };

 };

 }}

 #endif // BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED