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diff --git a/boost_ext/boost/bimap/container_adaptor/detail/key_extractor.hpp b/boost_ext/boost/bimap/container_adaptor/detail/key_extractor.hpp
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+// 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 container_adaptor/detail/key_extractor.hpp
+/// \brief Key extractor for a pair<Key,Data>.
+
+#ifndef BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_HPP
+#define BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp>
+
+#include <functional>
+
+namespace boost {
+namespace bimaps {
+namespace container_adaptor {
+namespace detail {
+
+/// \brief Key Extractor
+
+template < class T >
+struct key_from_pair_extractor 
+    : std::unary_function< T, BOOST_DEDUCED_TYPENAME T::first_type >
+{
+    bool operator()( const T & p ) { return p.first; }
+};
+
+} // namespace detail
+} // namespace container_adaptor
+} // namespace bimaps
+} // namespace boost
+
+
+#endif // BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_HPP
+
+