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+/* Copyright 2003-2008 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_INDEX_LOADER_HPP
+#define BOOST_MULTI_INDEX_DETAIL_INDEX_LOADER_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <algorithm>
+#include <boost/archive/archive_exception.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/multi_index/detail/auto_space.hpp>
+#include <boost/serialization/nvp.hpp>
+#include <boost/throw_exception.hpp>
+#include <cstddef>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* Counterpart of index_saver (check index_saver.hpp for serialization
+ * details.)* multi_index_container is in charge of supplying the info about
+ * the base sequence, and each index can subsequently load itself using the
+ * const interface of index_loader.
+ */
+
+template<typename Node,typename FinalNode,typename Allocator>
+class index_loader:private noncopyable
+{
+public:
+ index_loader(const Allocator& al,std::size_t size):
+ spc(al,size),size_(size),n(0),sorted(false)
+ {
+ }
+
+ template<class Archive>
+ void add(Node* node,Archive& ar,const unsigned int)
+ {
+ ar>>serialization::make_nvp("position",*node);
+ entries()[n++]=node;
+ }
+
+ template<class Archive>
+ void add_track(Node* node,Archive& ar,const unsigned int)
+ {
+ ar>>serialization::make_nvp("position",*node);
+ }
+
+ /* A rearranger is passed two nodes, and is expected to
+ * reposition the second after the first.
+ * If the first node is 0, then the second should be moved
+ * to the beginning of the sequence.
+ */
+
+ template<typename Rearranger,class Archive>
+ void load(Rearranger r,Archive& ar,const unsigned int)const
+ {
+ FinalNode* prev=unchecked_load_node(ar);
+ if(!prev)return;
+
+ if(!sorted){
+ std::sort(entries(),entries()+size_);
+ sorted=true;
+ }
+
+ check_node(prev);
+
+ for(;;){
+ for(;;){
+ FinalNode* node=load_node(ar);
+ if(!node)break;
+
+ if(node==prev)prev=0;
+ r(prev,node);
+
+ prev=node;
+ }
+ prev=load_node(ar);
+ if(!prev)break;
+ }
+ }
+
+private:
+ Node** entries()const{return &*spc.data();}
+
+ /* We try to delay sorting as much as possible just in case it
+ * is not necessary, hence this version of load_node.
+ */
+
+ template<class Archive>
+ FinalNode* unchecked_load_node(Archive& ar)const
+ {
+ Node* node=0;
+ ar>>serialization::make_nvp("pointer",node);
+ return static_cast<FinalNode*>(node);
+ }
+
+ template<class Archive>
+ FinalNode* load_node(Archive& ar)const
+ {
+ Node* node=0;
+ ar>>serialization::make_nvp("pointer",node);
+ check_node(node);
+ return static_cast<FinalNode*>(node);
+ }
+
+ void check_node(Node* node)const
+ {
+ if(node!=0&&!std::binary_search(entries(),entries()+size_,node)){
+ throw_exception(
+ archive::archive_exception(
+ archive::archive_exception::other_exception));
+ }
+ }
+
+ auto_space<Node*,Allocator> spc;
+ std::size_t size_;
+ std::size_t n;
+ mutable bool sorted;
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif