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+
+//  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
+//  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_ADD_REFERENCE_HPP_INCLUDED
+#define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
+
+#include <boost/detail/workaround.hpp>
+#include <boost/config.hpp>
+
+namespace boost {
+
+namespace detail {
+
+//
+// We can't filter out rvalue_references at the same level as
+// references or we get ambiguities from msvc:
+//
+
+template <typename T>
+struct add_reference_impl
+{
+    typedef T& type;
+};
+
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+template <typename T>
+struct add_reference_impl<T&&>
+{
+    typedef T&& type;
+};
+#endif
+
+} // namespace detail
+
+template <class T> struct add_reference
+{
+   typedef typename boost::detail::add_reference_impl<T>::type type;
+};
+template <class T> struct add_reference<T&>
+{
+   typedef T& type;
+};
+
+// these full specialisations are always required:
+template <> struct add_reference<void> { typedef void type; };
+#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
+template <> struct add_reference<const void> { typedef const void type; };
+template <> struct add_reference<const volatile void> { typedef const volatile void type; };
+template <> struct add_reference<volatile void> { typedef volatile void type; };
+#endif
+
+} // namespace boost
+
+#endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED