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

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  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_INDEX_LOADER_HPP
 10#define BOOST_MULTI_INDEX_DETAIL_INDEX_LOADER_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 <algorithm>
 18#include <boost/archive/archive_exception.hpp>
 19#include <boost/noncopyable.hpp>
 20#include <boost/multi_index/detail/auto_space.hpp>
 21#include <boost/serialization/nvp.hpp>
 22#include <boost/throw_exception.hpp> 
 23#include <cstddef>
 24
 25namespace boost{
 26
 27namespace multi_index{
 28
 29namespace detail{
 30
 31/* Counterpart of index_saver (check index_saver.hpp for serialization
 32 * details.)* multi_index_container is in charge of supplying the info about
 33 * the base sequence, and each index can subsequently load itself using the
 34 * const interface of index_loader.
 35 */
 36
 37template<typename Node,typename FinalNode,typename Allocator>
 38class index_loader:private noncopyable
 39{
 40public:
 41  index_loader(const Allocator& al,std::size_t size):
 42    spc(al,size),size_(size),n(0),sorted(false)
 43  {
 44  }
 45
 46  template<class Archive>
 47  void add(Node* node,Archive& ar,const unsigned int)
 48  {
 49    ar>>serialization::make_nvp("position",*node);
 50    entries()[n++]=node;
 51  }
 52
 53  template<class Archive>
 54  void add_track(Node* node,Archive& ar,const unsigned int)
 55  {
 56    ar>>serialization::make_nvp("position",*node);
 57  }
 58
 59  /* A rearranger is passed two nodes, and is expected to
 60   * reposition the second after the first.
 61   * If the first node is 0, then the second should be moved
 62   * to the beginning of the sequence.
 63   */
 64
 65  template<typename Rearranger,class Archive>
 66  void load(Rearranger r,Archive& ar,const unsigned int)const
 67  {
 68    FinalNode* prev=unchecked_load_node(ar);
 69    if(!prev)return;
 70
 71    if(!sorted){
 72      std::sort(entries(),entries()+size_);
 73      sorted=true;
 74    }
 75
 76    check_node(prev);
 77
 78    for(;;){
 79      for(;;){
 80        FinalNode* node=load_node(ar);
 81        if(!node)break;
 82
 83        if(node==prev)prev=0;
 84        r(prev,node);
 85
 86        prev=node;
 87      }
 88      prev=load_node(ar);
 89      if(!prev)break;
 90    }
 91  }
 92
 93private:
 94  Node** entries()const{return &*spc.data();}
 95
 96  /* We try to delay sorting as much as possible just in case it
 97   * is not necessary, hence this version of load_node.
 98   */
 99
100  template<class Archive>
101  FinalNode* unchecked_load_node(Archive& ar)const
102  {
103    Node* node=0;
104    ar>>serialization::make_nvp("pointer",node);
105    return static_cast<FinalNode*>(node);
106  }
107
108  template<class Archive>
109  FinalNode* load_node(Archive& ar)const
110  {
111    Node* node=0;
112    ar>>serialization::make_nvp("pointer",node);
113    check_node(node);
114    return static_cast<FinalNode*>(node);
115  }
116
117  void check_node(Node* node)const
118  {
119    if(node!=0&&!std::binary_search(entries(),entries()+size_,node)){
120      throw_exception(
121        archive::archive_exception(
122          archive::archive_exception::other_exception));
123    }
124  }
125
126  auto_space<Node*,Allocator> spc;
127  std::size_t                 size_;
128  std::size_t                 n;
129  mutable bool                sorted;
130};
131
132} /* namespace multi_index::detail */
133
134} /* namespace multi_index */
135
136} /* namespace boost */
137
138#endif