Re: [Vala] Another interface implementation problem

[Dominique Würtz <housirer gmx de>]

Jürg Billeter schrieb:
> Hi Dominique,
>
> On Sam, 2006-09-02 at 18:38 +0200, Dominique Würtz wrote:
>   
> > I'm struggling with the following hierarchy provided by GooCanvas (which 
> > I'm creating bindings for):
> >
> > interface Item {
> >     public abstract View create_view ();
> > }
> >
> > abstract class SimpleItem : Item {
> >     // This does _not_ implement create_view ()
> > }
> >
> > class MyItem : SimpleItem {
> >     public override View create_view ();
> > }
> >
> > Vala complains that it can't find I prototype for create_view () in 
> > SimpleItem which can be overridden. Out of curiosity I fed this 
> > hierarchy into the Mono C# compiler and found that C# requires you to 
> > implement the complete interface in SimpleItem. However, GooCanvas 
> > relies on these relaxed inheritance policies, so my question is, could 
> > Vala be modified to accept abstract classes implementing interfaces only 
> > partly?
> >     
>
> Yes, it makes sense to add this functionality to Vala. There is an easy
>   
Good to hear!

> workaround available if you only need it in bindings at the moment: You
> can just remove the overriding method from the VAPI file as the compiler
> doesn't really care which classes override which methods in bindings
Unfortunately no, because MyItem is not part of the bindings, but would 
be a custom implementation by an app (sorry, I wasn't clear here).

Dominique