On Wed, 11 Jul 2018 08:01:25 -0700, Thiago Macieira wrote: > There's no such C++ concept as "promote a class". What you're asking is > not possible.
I think I got confused myself with dynamic_cast, but of course what I had in mind was not modifying the instance itself, but create a new QApplication instance from the original QGuiApplication instance. That's what dynamic_cast also does when it doesn't simply return the original pointer, no? I have now seen from the code that this would probably be possible but not without refactoring. As I wrote in a private reply, maybe that one day it will be concluded that QGuiApplication could be rolled into QApplication (because what's a GUI application without widgets of some kind?). From an admittedly cursory glance at qapplication.cpp it seems that a QApplication initialised with a "noWidgets" flag would be largely identical to a QGuiApplication instance. It also seems that the widget-related initialisations could be deferred until they're actually needed in which case every QApplication would start out as a QGuiApplication. Maybe in Qt 7? :) R. _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
