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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | #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
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