On Sun, 8 Apr 2012 22:40:04 -0400, Luke Campagnola <lcamp...@email.unc.edu> wrote: > Howdy list, > > I'm trying to achieve some sort of multiple inheritance with custom classes > where each may define its own signals. I understand there are limitations > with SIP in this area, but It is not really necessary that QObject be > inherited more than once. As an example, consider the standard diamond > inheritance problem: > > A > / \ > B C > \ / > D > > If A is a subclass of QObject, then presumably classes B, C, and D could > all define their own signals (creating an instance of class D should only > result in a single C++ QObject instance, so in theory this should work > fine).
No, because Qt doesn't support it as it only handles "linear" chains of meta-objects. > In practice, this causes a segmentation fault when emitting signals > that were defined in class C. I've fixed it to raise an exception instead. > I'm not sure if this is a solvable problem at > all, but suggestions are welcome. I could potentially sidestep the issue by > breaking the inheritance between A and C, but then I can no longer define > signals from class C (Or rather, I can define signals, but attempting to > emit such a signal also leads to segmentation fault). > > Any ideas? Is there perhaps a way (using new-style signals) to send a > signal that is not defined as a class attribute? > > Thanks, > Luke Phil _______________________________________________ PyQt mailing list PyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
