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diff --git a/boost_ext/boost/bimap/tags/support/default_tagged.hpp b/boost_ext/boost/bimap/tags/support/default_tagged.hpp
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+++ b/boost_ext/boost/bimap/tags/support/default_tagged.hpp
@@ -0,0 +1,73 @@
+// Boost.Bimap
+//
+// Copyright (c) 2006-2007 Matias Capeletto
+//
+// 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)
+
+/// \file tags/support/default_tagged.hpp
+/// \brief Weak tagging
+
+#ifndef BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
+#define BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp>
+
+#include <boost/bimap/tags/tagged.hpp>
+
+/** \struct boost::bimaps::tags::support::default_tagged
+\brief Weak tagging metafunction
+
+\code
+template< class Type, class Tag >
+struct default_tagged
+{
+    typedef {TaggedType} type;
+};
+\endcode
+
+If the type is not tagged, this metafunction returns a tagged type with the
+default tag. If it is tagged, the returns the type unchanged.
+
+See also tagged, overwrite_tagged.
+                                                                                **/
+
+#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
+
+namespace boost {
+namespace bimaps {
+namespace tags {
+namespace support {
+
+
+// Default Tagging
+// A metafunction that create a tagged type with a default tag value.
+
+template< class Type, class DefaultTag >
+struct default_tagged
+{
+    typedef tagged<Type,DefaultTag> type;
+};
+
+template< class Type, class OldTag, class NewTag >
+struct default_tagged< tagged< Type, OldTag >, NewTag >
+{
+    typedef tagged<Type,OldTag> type;
+};
+
+} // namespace support
+} // namespace tags
+} // namespace bimaps
+} // namespace boost
+
+#endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
+
+#endif // BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
+
+
+