#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: empty_base.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#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 |