[857] | 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_HEADER_HOLDER_HPP
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| 10 | #define BOOST_MULTI_INDEX_DETAIL_HEADER_HOLDER_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/noncopyable.hpp>
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| 17 | #include <boost/utility/base_from_member.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 | /* An utility class derived from base_from_member used to hold
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| 26 | * a pointer to the header node. The base from member idiom is used
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| 27 | * because index classes, which are superclasses of multi_index_container,
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| 28 | * need this header in construction time.
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| 29 | * The allocation is made by the allocator of the multi_index_container
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| 30 | * class --hence, this allocator needs also be stored resorting
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| 31 | * to the base from member trick.
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| 32 | */
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| 33 |
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| 34 | template<typename NodeType,typename Final>
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| 35 | struct header_holder:base_from_member<NodeType*>,private noncopyable
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| 36 | {
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| 37 | header_holder():super(final().allocate_node()){}
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| 38 | ~header_holder(){final().deallocate_node(super::member);}
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| 39 |
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| 40 | private:
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| 41 | typedef base_from_member<NodeType*> super;
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| 42 | Final& final(){return *static_cast<Final*>(this);}
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| 43 | };
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| 44 |
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| 45 | } /* namespace multi_index::detail */
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| 46 |
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| 47 | } /* namespace multi_index */
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| 48 |
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| 49 | } /* namespace boost */
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| 50 |
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| 51 | #endif
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