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+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2005-2013. 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/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+//       This code comes from N1953 document by Howard E. Hinnant
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+#ifndef BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP
+#define BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP
+
+#ifndef BOOST_CONFIG_HPP
+#  include <boost/config.hpp>
+#endif
+
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#  pragma once
+#endif
+
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+
+#include <boost/container/detail/mpl.hpp>
+#include <boost/container/detail/type_traits.hpp>
+
+namespace boost{
+namespace container {
+namespace container_detail {
+
+template <class T, unsigned V>
+struct version_type
+    : public container_detail::integral_constant<unsigned, V>
+{
+    typedef T type;
+
+    version_type(const version_type<T, 0>&);
+};
+
+namespace impl{
+
+template <class T,
+          bool = container_detail::is_convertible<version_type<T, 0>, typename T::version>::value>
+struct extract_version
+{
+   static const unsigned value = 1;
+};
+
+template <class T>
+struct extract_version<T, true>
+{
+   static const unsigned value = T::version::value;
+};
+
+template <class T>
+struct has_version
+{
+   private:
+   struct two {char _[2];};
+   template <class U> static two test(...);
+   template <class U> static char test(const typename U::version*);
+   public:
+   static const bool value = sizeof(test<T>(0)) == 1;
+   void dummy(){}
+};
+
+template <class T, bool = has_version<T>::value>
+struct version
+{
+   static const unsigned value = 1;
+};
+
+template <class T>
+struct version<T, true>
+{
+   static const unsigned value = extract_version<T>::value;
+};
+
+}  //namespace impl
+
+template <class T>
+struct version
+   : public container_detail::integral_constant<unsigned, impl::version<T>::value>
+{};
+
+template<class T, unsigned N>
+struct is_version
+{
+   static const bool value =
+      is_same< typename version<T>::type, integral_constant<unsigned, N> >::value;
+};
+
+}  //namespace container_detail {
+
+typedef container_detail::integral_constant<unsigned, 0> version_0;
+typedef container_detail::integral_constant<unsigned, 1> version_1;
+typedef container_detail::integral_constant<unsigned, 2> version_2;
+
+}  //namespace container {
+}  //namespace boost{
+
+#include <boost/container/detail/config_end.hpp>
+
+#endif   //#define BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP