epoc32/include/stdapis/boost/multi_index/detail/header_holder.hpp
author William Roberts <williamr@symbian.org>
Wed, 31 Mar 2010 12:27:01 +0100
branchSymbian2
changeset 3 e1b950c65cb4
permissions -rw-r--r--
Attempt to represent the S^2->S^3 header reorganisation as a series of "hg rename" operations
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/* Copyright 2003-2005 Joaquín M López Muñoz.
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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 NodeType,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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  NodeType* 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