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並前往https://code.woboq.org/qt5/qtbase/src/corelib/kernel/qobject.h.html

qobject.h source code [qtbase/src/corelib/kernel/qobject.h]

523, "qobject_cast requires the type to have a Q_OBJECT macro" );. 524, return static_cast<T>(ObjType::staticMetaObject.cast(object));.

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