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53 lines
1023 B
C++
53 lines
1023 B
C++
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#ifndef BOOST_MPL_TAG_HPP_INCLUDED
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#define BOOST_MPL_TAG_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2004
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/void.hpp>
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#include <boost/mpl/aux_/has_tag.hpp>
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#include <boost/mpl/aux_/config/eti.hpp>
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namespace boost { namespace mpl {
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namespace aux {
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template< typename T > struct tag_impl
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{
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typedef typename T::tag type;
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};
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}
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template< typename T, typename Default = void_ > struct tag
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#if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
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: if_<
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aux::has_tag<T>
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, aux::tag_impl<T>
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, Default
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>::type
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{
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#else
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{
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typedef typename eval_if<
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aux::has_tag<T>
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, aux::tag_impl<T>
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, Default
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>::type type;
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#endif
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};
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}}
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#endif // BOOST_MPL_TAG_HPP_INCLUDED
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