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+/*=============================================================================
+ 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/config.hpp>
+#include <boost/utility/result_of.hpp>
+
+#if !defined(BOOST_RESULT_OF_USE_DECLTYPE) || defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+#define BOOST_FUSION_NO_DECLTYPE_BASED_RESULT_OF
+#endif
+
+#if !defined(BOOST_FUSION_NO_DECLTYPE_BASED_RESULT_OF)
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/or.hpp>
+#include <boost/mpl/has_xxx.hpp>
+#endif
+
+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_FUSION_NO_DECLTYPE_BASED_RESULT_OF)
+
+ template <typename Sig>
+ struct result_of_with_decltype : boost::tr1_result_of<Sig> {};
+
+#else // defined(BOOST_FUSION_NO_DECLTYPE_BASED_RESULT_OF)
+
+ 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 // defined(BOOST_FUSION_NO_DECLTYPE_BASED_RESULT_OF)
+
+}}}
+
+#endif