fee8944cbe
The Q_GADGET macro cannot be used in templates. It can however be useful to derive a template class from a Q_GADGET enabled base class to benefit from type safety features in C++ (e.g. the class could represent an id or handle for some C++ type). For proper wrapping of a QVariant with a gadget value in a QJSValue, the QMetaType::IsGadget flag must be set for the registered template instance type - which does not happen prior to the fix because IsGadgetHelper requires qt_check_for_QGADGET_macro to be defined in the registered class but not in an ancestor class - in other words: The class must declare Q_GADGET. To overcome this, IsGadgetHelper/IsPointerToGadgetHelper can now differentiate between a Q_GADGET flagged class (allowing automatic registration) and a derived class, e.g. a template class (forcing Q_DECLARE_METATYPE to be used explicitly). [ChangeLog][QtCore][QMetaObject] It is now possible to use template class instances inheriting from a Q_GADGET in Qml Task-number: QTBUG-66744 Change-Id: I7632ad45cff79fa422b3f852ca0b963f35fab155 Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com> |
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| io | ||
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| serialization | ||
| statemachine | ||
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| tools | ||
| corelib.pro | ||