diff --git a/include/boost/python/detail/value_arg.hpp b/include/boost/python/detail/value_arg.hpp
new file mode 100755
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+++ b/include/boost/python/detail/value_arg.hpp
@@ -0,0 +1,27 @@
+// Copyright David Abrahams 2004. 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)
+#ifndef VALUE_ARG_DWA2004312_HPP
+# define VALUE_ARG_DWA2004312_HPP
+
+# include <boost/python/detail/copy_ctor_mutates_rhs.hpp>
+# include <boost/mpl/if.hpp>
+# include <boost/type_traits/add_reference.hpp>
+# include <boost/type_traits/add_const.hpp>
+
+namespace boost { namespace python { namespace detail { 
+
+template <class T>
+struct value_arg
+  : mpl::if_<
+        copy_ctor_mutates_rhs<T>
+      , T
+      , typename add_reference<
+            typename add_const<T>::type
+        >::type
+  >
+{};
+  
+}}} // namespace boost::python::detail
+
+#endif // VALUE_ARG_DWA2004312_HPP