PR77998 Remove std::thread::_Invoker::result_type

[thirdparty/gcc.git] / libstdc++-v3 / include / std / future

diff --git a/libstdc++-v3/include/std/future b/libstdc++-v3/include/std/future
index 31a21f976eed4126bce1f16fd9e24d79eb1ea8dd..5542d49584ff6ff0de383d311a469947da1942a0 100644 (file)
--- a/libstdc++-v3/include/std/future
+++ b/libstdc++-v3/include/std/future
@@ -561,10 +561,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     class _Async_state_commonV2;
 #endif
 
-    template<typename _BoundFn, typename = typename _BoundFn::result_type>
+    template<typename _BoundFn,
+            typename _Res = decltype(std::declval<_BoundFn&>()())>
       class _Deferred_state;
 
-    template<typename _BoundFn, typename = typename _BoundFn::result_type>
+    template<typename _BoundFn,
+            typename _Res = decltype(std::declval<_BoundFn&>()())>
       class _Async_state_impl;
 
     template<typename _Signature>