Fix usage of std::enable_if_t to SFINAE out QProperty APIs

Declare an IfUntypedPropertyData alias and use that consistently.

Amends 311f8896322bcd39d33369c8311a8c89ccdad449.

Pick-to: 6.7
Change-Id: If36ef8e2f9ce25e0ffe7b4b448c31ea5866acfc3
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 5 insertions, 8 deletions

diff --git a/src/corelib/kernel/qpropertyprivate.h b/src/corelib/kernel/qpropertyprivate.h
index fa8fe04d5d..28cc04ff9d 100644
--- a/src/corelib/kernel/qpropertyprivate.h
+++ b/src/corelib/kernel/qpropertyprivate.h
@@ -124,16 +124,13 @@ struct QPropertyObserverPointer;
 
 class QUntypedPropertyData
 {
-public:
-#if QT_DEPRECATED_SINCE(6, 8)
-    // sentinel to check whether a class inherits QUntypedPropertyData
-    struct QT_DEPRECATED_VERSION_X_6_8("Use std::is_base_of instead.")
-            InheritsQUntypedPropertyData
-    {
-    };
-#endif
 };
 
+namespace QtPrivate {
+template <typename T>
+using IsUntypedPropertyData = std::enable_if_t<std::is_base_of_v<QUntypedPropertyData, T>, bool>;
+}
+
 template <typename T>
 class QPropertyData;