1/////////////////////////////////////////////////////////////////////////////
2//
3// (C) Copyright Ion Gaztanaga 2014-2014
4//
5// Distributed under the Boost Software License, Version 1.0.
6// (See accompanying file LICENSE_1_0.txt or copy at
7// http://www.boost.org/LICENSE_1_0.txt)
8//
9// See http://www.boost.org/libs/intrusive for documentation.
10//
11/////////////////////////////////////////////////////////////////////////////
12
13#ifndef BOOST_INTRUSIVE_DETAIL_DEFAULT_HEADER_HOLDER_HPP
14#define BOOST_INTRUSIVE_DETAIL_DEFAULT_HEADER_HOLDER_HPP
15
16#ifndef BOOST_CONFIG_HPP
17# include <boost/config.hpp>
18#endif
19
20#if defined(BOOST_HAS_PRAGMA_ONCE)
21# pragma once
22#endif
23
24#include <boost/intrusive/detail/workaround.hpp>
25#include <boost/intrusive/pointer_traits.hpp>
26#include <boost/move/detail/to_raw_pointer.hpp>
27
28namespace boost {
29namespace intrusive {
30namespace detail {
31
32// trivial header node holder
33template < typename NodeTraits >
34struct default_header_holder : public NodeTraits::node
35{
36 typedef NodeTraits node_traits;
37 typedef typename node_traits::node node;
38 typedef typename node_traits::node_ptr node_ptr;
39 typedef typename node_traits::const_node_ptr const_node_ptr;
40
41 default_header_holder() : node() {}
42
43 BOOST_INTRUSIVE_FORCEINLINE const_node_ptr get_node() const
44 { return pointer_traits< const_node_ptr >::pointer_to(*static_cast< const node* >(this)); }
45
46 BOOST_INTRUSIVE_FORCEINLINE node_ptr get_node()
47 { return pointer_traits< node_ptr >::pointer_to(*static_cast< node* >(this)); }
48
49 // (unsafe) downcast used to implement container-from-iterator
50 BOOST_INTRUSIVE_FORCEINLINE static default_header_holder* get_holder(const node_ptr &p)
51 { return static_cast< default_header_holder* >(boost::movelib::to_raw_pointer(p)); }
52};
53
54// type function producing the header node holder
55template < typename ValueTraits, typename HeaderHolder >
56struct get_header_holder_type
57{
58 typedef HeaderHolder type;
59};
60template < typename ValueTraits >
61struct get_header_holder_type< ValueTraits, void >
62{
63 typedef default_header_holder< typename ValueTraits::node_traits > type;
64};
65
66} //namespace detail
67} //namespace intrusive
68} //namespace boost
69
70#endif //BOOST_INTRUSIVE_DETAIL_DEFAULT_HEADER_HOLDER_HPP
71