I'm tinkering with using a Qt plugin that expects a QApplication in a
QGuiApplication (specifically, a QML application using QGuiApplication).
I'm not doing anything that causes a straight crash (or haven't run into that
one fatal instruction yet), but I do wonder:
is it in any way possible to promote a QGuiApplication instance to a
QApplication? Somewhat unexpectedly, `dynamic_cast<QApplication*>(qApp)`
behaves as `static_cast` or `const_cast` in this case (= it returns qApp). Or
it returns a nullptr in
QGuiApplication app(argc, argv);
QApplication *gapp = dynamic_cast<QApplication*>(&app);
which is probably what you'd expect.
Still, with QApplication inheriting QGuiApplication one could think that the
former does some initialisation the latter lacks and that it should be possible
to perform those steps at a later stade. Is it?
Interest mailing list