> On 11 Sep 2020, at 13:34, Allan Sandfeld Jensen <k...@carewolf.com> wrote: > > On Freitag, 11. September 2020 12:44:09 CEST Volker Hilsheimer wrote: >>> On 11 Sep 2020, at 12:37, Allan Sandfeld Jensen <k...@carewolf.com> wrote: >>> >>> Should we add a generic virtual hook in qobject, so any qobject can expand >>> > their with effectively virtual functions in Qt6? >>> >>> I imagine something like QVariant QObject::virtual_hook(int id, QVariant >>> args); >>> >>> Or do we already have other useful work-arounds for this common problem? >>> >>> Best regards >>> ‘Allan >> >> >> We have that already. It’s called qt_metacall :) >> > Right :) but that typically gets generated by moc, but I see what you mean. > You can manually implement it, or get a similar effect through careful use of > INVOKABLE and an indirection. > > And the two places I was thinking about cleaning up also turned out to be non- > QObject. > > Best regards > Allan
Yes, the idea is not to implement your own qt_metacall, but that you can make methods that you would like to be virtual into slots and then call them via QMetaObject::invoke. You can then “override" that slot in subclasses (ie declare an identical member, also as a slot). Not going to be lightning fast, but neither is going to be a dispatch through a virtual_hook and QVariant. Cheers, Volker _______________________________________________ Development mailing list Development@qt-project.org https://lists.qt-project.org/listinfo/development
