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+
+//  (C) Copyright Rani Sharoni 2003-2005.
+//  Use, modification and distribution are subject to 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/type_traits for most recent version including documentation.
+ 
+#ifndef BOOST_TT_IS_BASE_OF_HPP_INCLUDED
+#define BOOST_TT_IS_BASE_OF_HPP_INCLUDED
+
+#include <boost/type_traits/is_base_and_derived.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/is_class.hpp>
+
+namespace boost {
+
+   namespace detail{
+      template <class B, class D>
+      struct is_base_of_imp
+      {
+          typedef typename remove_cv<B>::type ncvB;
+          typedef typename remove_cv<D>::type ncvD;
+          BOOST_STATIC_CONSTANT(bool, value = (
+            (::boost::detail::is_base_and_derived_impl<ncvB,ncvD>::value) ||
+            (::boost::is_same<ncvB,ncvD>::value && ::boost::is_class<ncvB>::value)));
+      };
+   }
+
+   template <class Base, class Derived> struct is_base_of
+      : public integral_constant<bool, (::boost::detail::is_base_of_imp<Base, Derived>::value)> {};
+
+   template <class Base, class Derived> struct is_base_of<Base, Derived&> : false_type{};
+   template <class Base, class Derived> struct is_base_of<Base&, Derived&> : false_type{};
+   template <class Base, class Derived> struct is_base_of<Base&, Derived> : false_type{};
+
+} // namespace boost
+
+#endif // BOOST_TT_IS_BASE_AND_DERIVED_HPP_INCLUDED