| 1 | /* Copyright 2003-2013 Joaquin M Lopez Munoz. |
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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) |
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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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| 43 | |
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