#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