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71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2014-2014
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//
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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/intrusive for documentation.
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//
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/////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTRUSIVE_DETAIL_DEFAULT_HEADER_HOLDER_HPP
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#define BOOST_INTRUSIVE_DETAIL_DEFAULT_HEADER_HOLDER_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/intrusive/detail/workaround.hpp>
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#include <boost/intrusive/pointer_traits.hpp>
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#include <boost/move/detail/to_raw_pointer.hpp>
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namespace boost {
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namespace intrusive {
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namespace detail {
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// trivial header node holder
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template < typename NodeTraits >
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struct default_header_holder : public NodeTraits::node
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{
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typedef NodeTraits node_traits;
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typedef typename node_traits::node node;
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typedef typename node_traits::node_ptr node_ptr;
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typedef typename node_traits::const_node_ptr const_node_ptr;
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default_header_holder() : node() {}
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BOOST_INTRUSIVE_FORCEINLINE const_node_ptr get_node() const
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{ return pointer_traits< const_node_ptr >::pointer_to(*static_cast< const node* >(this)); }
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BOOST_INTRUSIVE_FORCEINLINE node_ptr get_node()
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{ return pointer_traits< node_ptr >::pointer_to(*static_cast< node* >(this)); }
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// (unsafe) downcast used to implement container-from-iterator
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BOOST_INTRUSIVE_FORCEINLINE static default_header_holder* get_holder(const node_ptr &p)
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{ return static_cast< default_header_holder* >(boost::movelib::to_raw_pointer(p)); }
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};
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// type function producing the header node holder
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template < typename ValueTraits, typename HeaderHolder >
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struct get_header_holder_type
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{
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typedef HeaderHolder type;
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};
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template < typename ValueTraits >
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struct get_header_holder_type< ValueTraits, void >
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{
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typedef default_header_holder< typename ValueTraits::node_traits > type;
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};
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} //namespace detail
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} //namespace intrusive
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} //namespace boost
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#endif //BOOST_INTRUSIVE_DETAIL_DEFAULT_HEADER_HOLDER_HPP
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