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