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50 lines
1.3 KiB
50 lines
1.3 KiB
/* Copyright 2003-2008 Joaquin M Lopez Munoz. |
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* Distributed under the Boost Software License, Version 1.0. |
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* (See accompanying file LICENSE_1_0.txt or copy at |
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* http://www.boost.org/LICENSE_1_0.txt) |
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* |
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* See http://www.boost.org/libs/multi_index for library home page. |
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*/ |
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#ifndef BOOST_MULTI_INDEX_DETAIL_HEADER_HOLDER_HPP |
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#define BOOST_MULTI_INDEX_DETAIL_HEADER_HOLDER_HPP |
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#if defined(_MSC_VER)&&(_MSC_VER>=1200) |
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#pragma once |
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#endif |
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#include <boost/noncopyable.hpp> |
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namespace boost{ |
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namespace multi_index{ |
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namespace detail{ |
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/* A utility class used to hold a pointer to the header node. |
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* The base from member idiom is used because index classes, which are |
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* superclasses of multi_index_container, need this header in construction |
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* time. The allocation is made by the allocator of the multi_index_container |
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* class --hence, this allocator needs also be stored resorting |
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* to the base from member trick. |
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*/ |
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template<typename NodeTypePtr,typename Final> |
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struct header_holder:private noncopyable |
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{ |
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header_holder():member(final().allocate_node()){} |
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~header_holder(){final().deallocate_node(&*member);} |
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NodeTypePtr member; |
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private: |
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Final& final(){return *static_cast<Final*>(this);} |
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}; |
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} /* namespace multi_index::detail */ |
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} /* namespace multi_index */ |
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} /* namespace boost */ |
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#endif
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