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+//-----------------------------------------------------------------------------
+// boost variant/detail/generic_result_type.hpp header file
+// See http://www.boost.org for updates, documentation, and revision history.
+//-----------------------------------------------------------------------------
+//
+// Copyright (c) 2003
+// Eric Friedman
+//
+// 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 BOOST_VARIANT_DETAIL_GENERIC_RESULT_TYPE_HPP
+#define BOOST_VARIANT_DETAIL_GENERIC_RESULT_TYPE_HPP
+
+#include <boost/config.hpp>
+
+//////////////////////////////////////////////////////////////////////////
+// (workaround) macro BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE
+//
+// On compilers with BOOST_NO_VOID_RETURNS, this macro provides a route
+// to a single syntax for dealing with template functions that may (but
+// not necessarily) return nothing (i.e. void).
+//
+// BOOST_VARIANT_AUX_RETURN_VOID provided for compilers w/ (erroneous?)
+// warnings about non-void functions not returning a value.
+//
+
+#if !defined(BOOST_NO_VOID_RETURNS)
+
+#define BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) \
+    T   \
+    /**/
+
+#define BOOST_VARIANT_AUX_RETURN_VOID  \
+    /**/
+
+#define BOOST_VARIANT_AUX_RETURN_VOID_TYPE \
+    void    \
+    /**/
+
+#else // defined(BOOST_NO_VOID_RETURNS)
+
+namespace boost {
+namespace detail { namespace variant {
+
+struct fake_return_void
+{
+    fake_return_void()
+    {
+    }
+
+    template <typename T>
+    fake_return_void(const T&)
+    {
+    }
+};
+
+template <typename T>
+struct no_void_returns_helper
+{
+    typedef T type;
+};
+
+template <>
+struct no_void_returns_helper<void>
+{
+    typedef fake_return_void type;
+};
+
+}} // namespace detail::variant
+} // namespace boost
+
+#define BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) \
+    BOOST_DEDUCED_TYPENAME                                           \
+        ::boost::detail::variant::no_void_returns_helper< T >::type  \
+    /**/
+
+#define BOOST_VARIANT_AUX_RETURN_VOID  \
+    return ::boost::detail::variant::fake_return_void()     \
+    /**/
+
+#define BOOST_VARIANT_AUX_RETURN_VOID_TYPE  \
+    ::boost::detail::variant::fake_return_void
+
+#endif // BOOST_NO_VOID_RETURNS workaround
+
+#endif // BOOST_VARIANT_DETAIL_GENERIC_RESULT_TYPE_HPP