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// Copyright Aleksey Gurtovoy 2000-2004
// Distributed under the Boost Software License, Version 1.0. 
// (See accompanying file LICENSE_1_0.txt or copy at 
// See for documentation.

// $Id$
// $Date$
// $Revision$

#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