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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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