/Src/Dependencies/Boost/boost/multi_index/detail/hash_index_node.hpp

  1/* Copyright 2003-2008 Joaquin M Lopez Munoz.
  2 * Distributed under the Boost Software License, Version 1.0.
  3 * (See accompanying file LICENSE_1_0.txt or copy at
  4 * http://www.boost.org/LICENSE_1_0.txt)
  5 *
  6 * See http://www.boost.org/libs/multi_index for library home page.
  7 */
  8
  9#ifndef BOOST_MULTI_INDEX_DETAIL_HASH_INDEX_NODE_HPP
 10#define BOOST_MULTI_INDEX_DETAIL_HASH_INDEX_NODE_HPP
 11
 12#if defined(_MSC_VER)&&(_MSC_VER>=1200)
 13#pragma once
 14#endif
 15
 16#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
 17#include <boost/detail/allocator_utilities.hpp>
 18#include <boost/multi_index/detail/prevent_eti.hpp>
 19#include <functional>
 20
 21namespace boost{
 22
 23namespace multi_index{
 24
 25namespace detail{
 26
 27/* singly-linked node for use by hashed_index */
 28
 29template<typename Allocator>
 30struct hashed_index_node_impl
 31{
 32  typedef typename prevent_eti<
 33    Allocator,
 34    typename boost::detail::allocator::rebind_to<
 35      Allocator,hashed_index_node_impl
 36    >::type
 37  >::type::pointer                                pointer;
 38  typedef typename prevent_eti<
 39    Allocator,
 40    typename boost::detail::allocator::rebind_to<
 41      Allocator,hashed_index_node_impl
 42    >::type
 43  >::type::const_pointer                          const_pointer;
 44
 45  pointer& next(){return next_;}
 46  pointer  next()const{return next_;}
 47
 48  /* algorithmic stuff */
 49
 50  static void increment(pointer& x,pointer bbegin,pointer bend)
 51  {
 52    std::less_equal<pointer> leq;
 53
 54    x=x->next();
 55    if(leq(bbegin,x)&&leq(x,bend)){ /* bucket node */
 56      do{
 57        ++x;
 58      }while(x->next()==x);
 59      x=x->next();
 60    }
 61  }
 62
 63  static void link(pointer x,pointer pos)
 64  {
 65    x->next()=pos->next();
 66    pos->next()=x;
 67  };
 68
 69  static void unlink(pointer x)
 70  {
 71    pointer y=x->next();
 72    while(y->next()!=x){y=y->next();}
 73    y->next()=x->next();
 74  }
 75
 76  static pointer prev(pointer x)
 77  {
 78    pointer y=x->next();
 79    while(y->next()!=x){y=y->next();}
 80    return y;
 81  }
 82
 83  static void unlink_next(pointer x)
 84  {
 85    x->next()=x->next()->next();
 86  }
 87
 88private:
 89  pointer next_;
 90};
 91
 92template<typename Super>
 93struct hashed_index_node_trampoline:
 94  prevent_eti<
 95    Super,
 96    hashed_index_node_impl<
 97      typename boost::detail::allocator::rebind_to<
 98        typename Super::allocator_type,
 99        char
100      >::type
101    >
102  >::type
103{
104  typedef typename prevent_eti<
105    Super,
106    hashed_index_node_impl<
107      typename boost::detail::allocator::rebind_to<
108        typename Super::allocator_type,
109        char
110      >::type
111    >
112  >::type impl_type;
113};
114
115template<typename Super>
116struct hashed_index_node:Super,hashed_index_node_trampoline<Super>
117{
118private:
119  typedef hashed_index_node_trampoline<Super> trampoline;
120
121public:
122  typedef typename trampoline::impl_type     impl_type;
123  typedef typename trampoline::pointer       impl_pointer;
124  typedef typename trampoline::const_pointer const_impl_pointer;
125
126  impl_pointer impl()
127  {
128    return static_cast<impl_pointer>(
129      static_cast<impl_type*>(static_cast<trampoline*>(this)));
130  }
131
132  const_impl_pointer impl()const
133  {
134    return static_cast<const_impl_pointer>(
135      static_cast<const impl_type*>(static_cast<const trampoline*>(this)));
136  }
137
138  static hashed_index_node* from_impl(impl_pointer x)
139  {
140    return static_cast<hashed_index_node*>(
141      static_cast<trampoline*>(&*x));
142  }
143
144  static const hashed_index_node* from_impl(const_impl_pointer x)
145  {
146    return static_cast<const hashed_index_node*>(
147      static_cast<const trampoline*>(&*x));
148  }
149
150  static void increment(
151    hashed_index_node*& x,impl_pointer bbegin,impl_pointer bend)
152  {
153    impl_pointer xi=x->impl();
154    trampoline::increment(xi,bbegin,bend);
155    x=from_impl(xi);
156  }
157};
158
159} /* namespace multi_index::detail */
160
161} /* namespace multi_index */
162
163} /* namespace boost */
164
165#endif