Re: A protected slot is not accessible in a subclass

[Panicz Maciej Godek <godek.maciek@gmail.com>]

pt., 25 mar 2022 o 19:46 Per Bothner <per@bothner.com> napisał(a):

>
>
> On 3/25/22 02:59, Panicz Maciej Godek wrote:
> > I tried this:
> > (define-simple-class S (gnu.mapping.Symbol)
> >     ((*init*)
> >      (invoke-special gnu.mapping.Symbol (this) '*init*
> (("foo":toString):intern) gnu.mapping.Namespace:EmptyNamespace)
> >   (set! (field (this) 'name) (("bar":toString):intern))))
> > but it gives a similar error:
> > java.lang.RuntimeException: no such field name in S
> >          at gnu.kawa.reflect.SlotSet.apply(SlotSet.java:115)
>             at gnu.kawa.reflect.SlotSet.apply3(SlotSet.java:120)
> >          at S.<init>(tty:14)
>
> This fails because the (set! (field ...) ...) isn't inlined, so we end up
> using
> run-time reflection.  This is a missing Kawa optimization.
>
> Using set-field! instead does work:
>
>   (set-field! (this) 'name (("bar":toString):intern))
>
> Note in this case you need to add:
>
> (import (kawa reflect)) ; for set-field!
>

Yes, that one works! Thanks!


>
> I checked in a fix so either of these now work:
>
>   (set! (this):name (("bar":toString):intern))
>   (set! name (("bar":toString):intern))
>
>
This one works now too, thanks a lot!