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diff --git a/boost/flyweight/detail/serialization_helper.hpp b/boost/flyweight/detail/serialization_helper.hpp
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+/* Copyright 2006-2014 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/flyweight for library home page.
+ */
+
+#ifndef BOOST_FLYWEIGHT_DETAIL_SERIALIZATION_HELPER_HPP
+#define BOOST_FLYWEIGHT_DETAIL_SERIALIZATION_HELPER_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 <boost/multi_index_container.hpp>
+#include <boost/multi_index/hashed_index.hpp>
+#include <boost/multi_index/random_access_index.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/serialization/extended_type_info.hpp>
+#include <vector>
+
+namespace boost{
+
+namespace flyweights{
+
+namespace detail{
+
+/* The serialization helpers for flyweight<T> map numerical IDs to
+ * flyweight exemplars --an exemplar is the flyweight object
+ * associated to a given value that appears first on the serialization
+ * stream, so that subsequent equivalent flyweight objects will be made
+ * to refer to it during the serialization process.
+ */
+
+template<typename Flyweight>
+struct flyweight_value_address
+{
+  typedef const typename Flyweight::value_type* result_type;
+
+  result_type operator()(const Flyweight& x)const{return &x.get();}
+};
+
+template<typename Flyweight>
+class save_helper:private noncopyable
+{
+  typedef multi_index::multi_index_container<
+    Flyweight,
+    multi_index::indexed_by<
+      multi_index::random_access<>,
+      multi_index::hashed_unique<flyweight_value_address<Flyweight> >
+    >
+  > table;
+
+public:
+
+  typedef typename table::size_type size_type;
+
+  size_type size()const{return t.size();}
+
+  size_type find(const Flyweight& x)const
+  {
+    return multi_index::project<0>(t,multi_index::get<1>(t).find(&x.get()))
+             -t.begin();
+  }
+
+  void push_back(const Flyweight& x){t.push_back(x);}
+  
+private:
+  table t;
+};
+
+template<typename Flyweight>
+class load_helper:private noncopyable
+{
+  typedef std::vector<Flyweight> table;
+
+public:
+
+  typedef typename table::size_type size_type;
+
+  size_type size()const{return t.size();}
+
+  Flyweight operator[](size_type n)const{return t[n];}
+
+  void push_back(const Flyweight& x){t.push_back(x);}
+  
+private:
+  table t;
+};
+
+} /* namespace flyweights::detail */
+
+} /* namespace flyweights */
+
+} /* namespace boost */
+
+#endif