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#ifndef BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
#define BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2001-2004
//
// 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.
// $Id$
// $Date$
// $Revision$
#include <boost/mpl/bool.hpp>
#include <boost/mpl/aux_/config/msvc.hpp>
#include <boost/mpl/aux_/config/workaround.hpp>
#include <boost/type_traits/is_empty.hpp>
// should be always the last #include directive
#include <boost/type_traits/detail/bool_trait_def.hpp>
namespace boost { namespace mpl {
// empty base class, guaranteed to have no members; inheritance from
// 'empty_base' through the 'inherit' metafunction is a no-op - see
// "mpl/inherit.hpp> header for the details
struct empty_base {};
template< typename T >
struct is_empty_base
: false_
{
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
using false_::value;
#endif
};
template<>
struct is_empty_base<empty_base>
: true_
{
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
using true_::value;
#endif
};
}}
namespace boost {
BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_empty, mpl::empty_base, true)
}
#include <boost/type_traits/detail/bool_trait_undef.hpp>
#endif // BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
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