

#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.



// $Source$

// $Date: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $

// $Revision: 24874 $



#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

