You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
59 lines
1.4 KiB
59 lines
1.4 KiB
|
|
#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
|
|
|