Remove use of result_of_t

It has been deprecated in favor of invoke_result_t

Author: timower

libs/rMlib/include/UI/Future.h

@@ -117,7 +117,7 @@ class Future {
   /// Has no effect if the shared state already has value.
   template<typename Func>
   auto then(Func&& func) {
-    using Result = std::result_of_t<Func(T)>;
+    using Result = std::invoke_result_t<Func, T>;
 
     if constexpr (details::FutureTraits<Result>::value) {
       using FutResult = typename details::FutureTraits<Result>::ResultType;
@@ -194,7 +194,7 @@ class Future<void> {
 
   template<typename Func>
   auto then(Func&& func) {
-    using Result = std::result_of_t<Func()>;
+    using Result = std::invoke_result_t<Func>;
     if constexpr (details::FutureTraits<Result>::value) {
       using FutResult = typename details::FutureTraits<Result>::ResultType;
       auto newPromise = Promise<FutResult>();

libs/rMlib/include/UI/StatefulWidget.h

@@ -24,10 +24,10 @@ using StateType = decltype(std::declval<const DerivedSW>().createState());
 // using StateType = std::result_of_t<decltype (&DerivedSW::createState)()>;
 
 template<typename DerivedSW>
-using WidgetType = std::result_of_t<decltype (&StateType<DerivedSW>::build)(
-  const StateType<DerivedSW>,
-  AppContext&,
-  const BuildContext&)>;
+using WidgetType = std::invoke_result_t<decltype(&StateType<DerivedSW>::build),
+                                        const StateType<DerivedSW>,
+                                        AppContext&,
+                                        const BuildContext&>;
 
 } // namespace details