53 lines
1.0 KiB
Plaintext
53 lines
1.0 KiB
Plaintext
|
|
#ifndef BOOST_MPL_TAG_HPP_INCLUDED
|
|
#define BOOST_MPL_TAG_HPP_INCLUDED
|
|
|
|
// Copyright Aleksey Gurtovoy 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/eval_if.hpp>
|
|
#include <boost/mpl/void.hpp>
|
|
#include <boost/mpl/aux_/has_tag.hpp>
|
|
#include <boost/mpl/aux_/config/eti.hpp>
|
|
|
|
namespace boost { namespace mpl {
|
|
|
|
namespace aux {
|
|
template< typename T > struct tag_impl
|
|
{
|
|
typedef typename T::tag type;
|
|
};
|
|
}
|
|
|
|
template< typename T, typename Default = void_ > struct tag
|
|
#if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
|
|
: if_<
|
|
aux::has_tag<T>
|
|
, aux::tag_impl<T>
|
|
, Default
|
|
>::type
|
|
{
|
|
#else
|
|
{
|
|
typedef typename eval_if<
|
|
aux::has_tag<T>
|
|
, aux::tag_impl<T>
|
|
, Default
|
|
>::type type;
|
|
|
|
#endif
|
|
};
|
|
|
|
}}
|
|
|
|
#endif // BOOST_MPL_TAG_HPP_INCLUDED
|