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diff --git a/senf/boost_intrusive/detail/pointer_type.hpp b/senf/boost_intrusive/detail/pointer_type.hpp
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+++ b/senf/boost_intrusive/detail/pointer_type.hpp
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+/////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztañaga 2006. 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/intrusive for documentation.
+//
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTRUSIVE_POINTER_TYPE_HPP
+#define BOOST_INTRUSIVE_POINTER_TYPE_HPP
+
+#include "config_begin.hpp"
+
+namespace boost {
+namespace intrusive {
+namespace detail  {
+
+struct two {char _[2];};
+
+namespace pointer_type_imp
+{
+
+template <class U> static two  test(...);
+template <class U> static char test(typename U::pointer* = 0);
+
+}  //namespace pointer_type_imp
+
+template <class T>
+struct has_pointer_type
+{
+    static const bool value = sizeof(pointer_type_imp::test<T>(0)) == 1;
+};
+
+template <class T, class A, bool = has_pointer_type<A>::value>
+struct pointer_type
+{
+    typedef typename A::pointer type;
+};
+
+template <class T, class A>
+struct pointer_type<T, A, false>
+{
+    typedef T* type;
+};
+
+}  //namespace detail
+}  //namespace intrusive
+} // namespace boost
+
+#include "config_end.hpp"
+
+#endif   //#ifndef BOOST_INTRUSIVE_POINTER_TYPE_HPP