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+/* Copyright 2003-2013 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_SAVER_HPP
+#define BOOST_MULTI_INDEX_DETAIL_INDEX_SAVER_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/multi_index/detail/index_matcher.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/serialization/nvp.hpp>
+#include <cstddef>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* index_saver accepts a base sequence of previously saved elements
+ * and saves a possibly reordered subsequence in an efficient manner,
+ * serializing only the information needed to rearrange the subsequence
+ * based on the original order of the base.
+ * multi_index_container is in charge of supplying the info about the
+ * base sequence, and each index can subsequently save itself using the
+ * const interface of index_saver.
+ */
+
+template<typename Node,typename Allocator>
+class index_saver:private noncopyable
+{
+public:
+  index_saver(const Allocator& al,std::size_t size):alg(al,size){}
+
+  template<class Archive>
+  void add(Node* node,Archive& ar,const unsigned int)
+  {
+    ar<<serialization::make_nvp("position",*node);
+    alg.add(node);
+  }
+
+  template<class Archive>
+  void add_track(Node* node,Archive& ar,const unsigned int)
+  {
+    ar<<serialization::make_nvp("position",*node);
+  }
+
+  template<typename IndexIterator,class Archive>
+  void save(
+    IndexIterator first,IndexIterator last,Archive& ar,
+    const unsigned int)const
+  {
+    /* calculate ordered positions */
+
+    alg.execute(first,last);
+
+    /* Given a consecutive subsequence of displaced elements
+     * x1,...,xn, the following information is serialized:
+     *
+     *   p0,p1,...,pn,0
+     *
+     * where pi is a pointer to xi and p0 is a pointer to the element
+     * preceding x1. Crealy, from this information is possible to
+     * restore the original order on loading time. If x1 is the first
+     * element in the sequence, the following is serialized instead:
+     *
+     *   p1,p1,...,pn,0
+     *
+     * For each subsequence of n elements, n+2 pointers are serialized.
+     * An optimization policy is applied: consider for instance the
+     * sequence
+     *
+     *   a,B,c,D
+     * 
+     * where B and D are displaced, but c is in its correct position.
+     * Applying the schema described above we would serialize 6 pointers:
+     *
+     *  p(a),p(B),0
+     *  p(c),p(D),0
+     * 
+     * but this can be reduced to 5 pointers by treating c as a displaced
+     * element:
+     *
+     *  p(a),p(B),p(c),p(D),0
+     */
+
+    std::size_t last_saved=3; /* distance to last pointer saved */
+    for(IndexIterator it=first,prev=first;it!=last;prev=it++,++last_saved){
+      if(!alg.is_ordered(get_node(it))){
+        if(last_saved>1)save_node(get_node(prev),ar);
+        save_node(get_node(it),ar);
+        last_saved=0;
+      }
+      else if(last_saved==2)save_node(null_node(),ar);
+    }
+    if(last_saved<=2)save_node(null_node(),ar);
+
+    /* marks the end of the serialization info for [first,last) */
+
+    save_node(null_node(),ar);
+  }
+
+private:
+  template<typename IndexIterator>
+  static Node* get_node(IndexIterator it)
+  {
+    return it.get_node();
+  }
+
+  static Node* null_node(){return 0;}
+
+  template<typename Archive>
+  static void save_node(Node* node,Archive& ar)
+  {
+    ar<<serialization::make_nvp("pointer",node);
+  }
+
+  index_matcher::algorithm<Node,Allocator> alg;
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif