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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/intrusive/detail/to_raw_pointer.hpp> | |
27 | ||
28 | namespace boost { | |
29 | namespace intrusive { | |
30 | namespace detail { | |
31 | ||
32 | // trivial header node holder | |
33 | template < typename NodeTraits > | |
34 | struct 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::intrusive::detail::to_raw_pointer(p)); } | |
52 | }; | |
53 | ||
54 | // type function producing the header node holder | |
55 | template < typename ValueTraits, typename HeaderHolder > | |
56 | struct get_header_holder_type | |
57 | { | |
58 | typedef HeaderHolder type; | |
59 | }; | |
60 | template < typename ValueTraits > | |
61 | struct 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 |