#ifndef BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED

 #define BOOST_MPL_AUX_EMPTY_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_/empty_impl.hpp,v $

 // $Date: 2004/09/02 15:40:43 $

 // $Revision: 1.4 $

 #include <boost/mpl/empty_fwd.hpp>

 #include <boost/mpl/begin_end.hpp>

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

 #include <boost/type_traits/is_same.hpp>

 namespace boost { namespace mpl {

 // default implementation; conrete sequences might override it by 

 // specializing either the 'empty_impl' or the primary 'empty' template

 template< typename Tag >

 struct empty_impl

 {

     template< typename Sequence > struct apply

         : is_same<

               typename begin<Sequence>::type

             , typename end<Sequence>::type

             >

     {

     };

 };

 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,empty_impl)

 }}

 #endif // BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED