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| 2 | #ifndef BOOST_MPL_TAG_HPP_INCLUDED
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| 3 | #define BOOST_MPL_TAG_HPP_INCLUDED
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| 4 |
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| 5 | // Copyright Aleksey Gurtovoy 2004
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| 6 | //
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| 7 | // Distributed under the Boost Software License, Version 1.0.
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| 8 | // (See accompanying file LICENSE_1_0.txt or copy at
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| 9 | // http://www.boost.org/LICENSE_1_0.txt)
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| 10 | //
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| 11 | // See http://www.boost.org/libs/mpl for documentation.
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| 12 |
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| 13 | // $Source: /cvsroot/boost/boost/boost/mpl/tag.hpp,v $
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| 14 | // $Date: 2004/09/02 15:40:42 $
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| 15 | // $Revision: 1.2 $
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| 16 |
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| 17 | #include <boost/mpl/eval_if.hpp>
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| 18 | #include <boost/mpl/void.hpp>
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| 19 | #include <boost/mpl/aux_/has_tag.hpp>
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| 20 | #include <boost/mpl/aux_/config/eti.hpp>
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| 21 |
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| 22 | namespace boost { namespace mpl {
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| 23 |
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| 24 | namespace aux {
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| 25 | template< typename T > struct tag_impl
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| 26 | {
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| 27 | typedef typename T::tag type;
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| 28 | };
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| 29 | }
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| 30 |
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| 31 | template< typename T, typename Default = void_ > struct tag
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| 32 | #if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
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| 33 | : if_<
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| 34 | aux::has_tag<T>
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| 35 | , aux::tag_impl<T>
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| 36 | , Default
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| 37 | >::type
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| 38 | {
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| 39 | #else
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| 40 | {
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| 41 | typedef typename eval_if<
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| 42 | aux::has_tag<T>
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| 43 | , aux::tag_impl<T>
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| 44 | , Default
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| 45 | >::type type;
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| 46 |
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| 47 | #endif
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| 48 | };
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| 49 |
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| 50 | }}
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| 51 |
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| 52 | #endif // BOOST_MPL_TAG_HPP_INCLUDED
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