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diff --git a/boost_ext/boost/multi_index/detail/unbounded.hpp b/boost_ext/boost/multi_index/detail/unbounded.hpp
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+/* Copyright 2003-2007 Joaquín M López Muñoz.
+ * 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_UNBOUNDED_HPP
+#define BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_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/detail/workaround.hpp>
+
+namespace boost{
+
+namespace multi_index{
+
+/* dummy type and variable for use in ordered_index::range() */
+
+#if BOOST_WORKAROUND(BOOST_MSVC,<1300)
+/* The default branch actually works for MSVC 6.0, but seems like
+ * this implementation of unbounded improves the performance of ordered
+ * indices! This behavior is hard to explain and probably a test artifact,
+ * but it does not hurt to have the workaround anyway.
+ */
+
+namespace detail{struct unbounded_type{};}
+
+namespace{
+
+static detail::unbounded_type  unbounded_obj=detail::unbounded_type();
+static detail::unbounded_type& unbounded=unbounded_obj;
+
+} /* unnamed */
+#else
+/* ODR-abiding technique shown at the example attached to
+ * http://lists.boost.org/Archives/boost/2006/07/108355.php
+ */
+
+namespace detail{class unbounded_helper;}
+
+detail::unbounded_helper unbounded(detail::unbounded_helper);
+
+namespace detail{
+
+class unbounded_helper
+{
+  unbounded_helper(){}
+  unbounded_helper(const unbounded_helper&){}
+  friend unbounded_helper multi_index::unbounded(unbounded_helper);
+};
+
+typedef unbounded_helper (*unbounded_type)(unbounded_helper);
+
+} /* namespace multi_index::detail */
+
+inline detail::unbounded_helper unbounded(detail::unbounded_helper)
+{
+  return detail::unbounded_helper();
+}
+#endif
+
+/* tags used in the implementation of range */
+
+namespace detail{
+
+struct none_unbounded_tag{};
+struct lower_unbounded_tag{};
+struct upper_unbounded_tag{};
+struct both_unbounded_tag{};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif