ceph/src/boost/libs/intrusive/include/boost/intrusive/derivation_value_traits.hpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga  2006-2013
   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_DERIVATION_VALUE_TRAITS_HPP
  14 #define BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP
  15
  16 #include <boost/intrusive/detail/config_begin.hpp>
  17 #include <boost/intrusive/intrusive_fwd.hpp>
  18 #include <boost/intrusive/link_mode.hpp>
  19 #include <boost/intrusive/pointer_traits.hpp>
  20
  21 #if defined(BOOST_HAS_PRAGMA_ONCE)
  22 #  pragma once
  23 #endif
  24
  25 namespace boost {
  26 namespace intrusive {
  27
  28 //!This value traits template is used to create value traits
  29 //!from user defined node traits where value_traits::value_type will
  30 //!derive from node_traits::node
  31
  32 template<class T, class NodeTraits, link_mode_type LinkMode
  33    #ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
  34    = safe_link
  35    #endif
  36 >
  37 struct derivation_value_traits
  38 {
  39    public:
  40    typedef NodeTraits                                                node_traits;
  41    typedef T                                                         value_type;
  42    typedef typename node_traits::node                                node;
  43    typedef typename node_traits::node_ptr                            node_ptr;
  44    typedef typename node_traits::const_node_ptr                      const_node_ptr;
  45    typedef typename pointer_traits<node_ptr>::
  46       template rebind_pointer<value_type>::type                      pointer;
  47    typedef typename pointer_traits<node_ptr>::
  48       template rebind_pointer<const value_type>::type                const_pointer;
  49    typedef typename boost::intrusive::
  50       pointer_traits<pointer>::reference                             reference;
  51    typedef typename boost::intrusive::
  52       pointer_traits<const_pointer>::reference                       const_reference;
  53    static const link_mode_type link_mode = LinkMode;
  54
  55    static node_ptr to_node_ptr(reference value)
  56    { return node_ptr(&value); }
  57
  58    static const_node_ptr to_node_ptr(const_reference value)
  59    { return node_ptr(&value); }
  60
  61    static pointer to_value_ptr(const node_ptr &n)
  62    {
  63       return pointer_traits<pointer>::pointer_to(static_cast<reference>(*n));
  64    }
  65
  66    static const_pointer to_value_ptr(const const_node_ptr &n)
  67    {
  68       return pointer_traits<pointer>::pointer_to(static_cast<const_reference>(*n));
  69    }
  70 };
  71
  72 } //namespace intrusive
  73 } //namespace boost
  74
  75 #include <boost/intrusive/detail/config_end.hpp>
  76
  77 #endif //BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP