sl@0: 
sl@0: #ifndef BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
sl@0: #define BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
sl@0: 
sl@0: // Copyright Aleksey Gurtovoy 2001-2004
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. 
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at 
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/libs/mpl for documentation.
sl@0: 
sl@0: // $Source: /cvsroot/boost/boost/boost/mpl/empty_base.hpp,v $
sl@0: // $Date: 2004/09/02 15:40:41 $
sl@0: // $Revision: 1.4 $
sl@0: 
sl@0: #include <boost/mpl/bool.hpp>
sl@0: #include <boost/mpl/aux_/config/msvc.hpp>
sl@0: #include <boost/mpl/aux_/config/workaround.hpp>
sl@0: 
sl@0: #include <boost/type_traits/is_empty.hpp>
sl@0: 
sl@0: // should be always the last #include directive
sl@0: #include <boost/type_traits/detail/bool_trait_def.hpp>
sl@0: 
sl@0: namespace boost { namespace mpl {
sl@0: 
sl@0: // empty base class, guaranteed to have no members; inheritance from
sl@0: // 'empty_base' through the 'inherit' metafunction is a no-op - see 
sl@0: // "mpl/inherit.hpp> header for the details
sl@0: struct empty_base {};
sl@0: 
sl@0: template< typename T >
sl@0: struct is_empty_base
sl@0:     : false_
sl@0: {
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0:     using false_::value;
sl@0: #endif
sl@0: };
sl@0: 
sl@0: template<>
sl@0: struct is_empty_base<empty_base>
sl@0:     : true_
sl@0: {
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0:     using true_::value;
sl@0: #endif
sl@0: };
sl@0: 
sl@0: }}
sl@0: 
sl@0: namespace boost {
sl@0: BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_empty, mpl::empty_base, true)
sl@0: }
sl@0: 
sl@0: #include <boost/type_traits/detail/bool_trait_undef.hpp>
sl@0: 
sl@0: #endif // BOOST_MPL_EMPTY_BASE_HPP_INCLUDED