Re: [Vala] Override a "protected abstract method" as "private"

[Abderrahim Kitouni <a kitouni gmail com>]

Hello,
                  في ح، 19-12-2010 عند 09:47 +0100 ، كتب Mike Massonnet:
> Hi,
>
> I hope the subject is not too missleading :)
>
> I have the following method in a base class:
>   protected abstract void method();
>
> which I'm implemented in a sub-class like this:
>   private override void method () { }
>
> There is a compilation issue with vala-git:
> error: Private member `Xnp.TitleBarButton.draw_icon' cannot be marked
> as override, virtual, or abstract
>
> Why would this fail, as it currently works fine with Vala 0.10?
private doesn't make sense in virtual methods : a virtual method can be
overridden and called (to allow for chaining up) by a subclass, and
should thus be protected if not public. An overriding method has the
same behavior : a subclass can always chain up to the base class'
implementation, which thus cannot be private.

As for why valac 0.10 doesn't report an error, it's a "known problem" :
nobody thought about this at the time :-)

HTH,
Abderrahim