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1 | /* Copyright 2003-2005 Joaquín M López Muñoz.
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2 | * Distributed under the Boost Software License, Version 1.0.
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3 | * (See accompanying file LICENSE_1_0.txt or copy at
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4 | * http://www.boost.org/LICENSE_1_0.txt)
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5 | *
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6 | * See http://www.boost.org/libs/multi_index for library home page.
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7 | */
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8 |
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9 | #ifndef BOOST_MULTI_INDEX_DETAIL_HAS_TAG_HPP
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10 | #define BOOST_MULTI_INDEX_DETAIL_HAS_TAG_HPP
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11 |
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12 | #if defined(_MSC_VER)&&(_MSC_VER>=1200)
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13 | #pragma once
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14 | #endif
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15 |
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16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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17 | #include <boost/mpl/contains.hpp>
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18 |
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19 | namespace boost{
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20 |
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21 | namespace multi_index{
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22 |
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23 | namespace detail{
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24 |
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25 | /* determines whether an index type has a given tag in its tag list */
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26 |
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27 | template<typename Tag>
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28 | struct has_tag
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29 | {
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30 | template<typename Index>
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31 | struct apply:mpl::contains<BOOST_DEDUCED_TYPENAME Index::tag_list,Tag>
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32 | {
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33 | };
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34 | };
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35 |
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36 | } /* namespace multi_index::detail */
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37 |
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38 | } /* namespace multi_index */
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39 |
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40 | } /* namespace boost */
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41 |
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42 | #endif
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