correct fix for ticket 10676. this is a temporary fix until we overhaul the fold implementation.

include/boost/fusion/support/detail/result_of.hpp

@@ -0,0 +1,42 @@
+/*=============================================================================
+    Copyright (c) 2001-2014 Joel de Guzman
+
+    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)
+==============================================================================*/
+#if !defined(FUSION_RESULT_OF_10272014_0654)
+#define FUSION_RESULT_OF_10272014_0654
+
+#include <boost/utility/result_of.hpp>
+
+namespace boost { namespace fusion { namespace detail
+{
+    // This is a temporary workaround for result_of before we make fusion fully
+    // sfinae result_of friendy, which will require some heavy lifting for some
+    // low level code. So far this is used only in the fold algorithm. This will
+    // be removed once we overhaul fold.
+
+#if defined(BOOST_NO_CXX11_DECLTYPE)
+
+    template <typename Sig>
+    struct result_of_with_decltype : boost::tr1_result_of<Sig> {};
+
+#else
+
+    BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
+    BOOST_MPL_HAS_XXX_TEMPLATE_DEF(result)
+
+    template <typename Sig>
+    struct result_of_with_decltype;
+
+    template <typename F, typename... Args>
+    struct result_of_with_decltype<F(Args...)>
+        : mpl::if_<mpl::or_<has_result_type<F>, detail::has_result<F>>,
+            boost::tr1_result_of<F(Args...)>,
+            boost::detail::cpp0x_result_of<F(Args...)>>::type {};
+
+#endif
+
+}}}
+
+#endif