Re: Guile-2.2 - goops slot redefinition at subclass level

[Christopher Allan Webber]

Andy Wingo writes:

> On Mon 27 Feb 2017 01:09, David Pirotte  writes:
>
>> 2-   slot redefinition at subclass level
>>
>> See bug#20423 for a full description.
>
> I think the correct solution here is to implement the slot combination
> protocol; see http://mop.lisp.se/dictionary.html#compute-slots.  This
> can be done in 2.2.  It's all in Scheme now so hopefully it will be
> easier to hack on.
>
> I do not have any time to devote to this area, however, and as it's
> possible to implement this in the stable series and it's not a
> regression, I don't think it's a release blocker.
>
> Andy

Okay, it's good to know that you're open to this being implemented as a
feature (and that there's a clear explaination of how to do it above).
Maybe in the not too distant future I can take a crack at it, as it's
something I'd love to have myself.

 - Chris

Re: Guile-2.2 - goops slot redefinition at subclass level

[Andy Wingo]

On Mon 27 Feb 2017 01:09, David Pirotte  writes:

> 2-slot redefinition at subclass level
>
> See bug#20423 for a full description.

I think the correct solution here is to implement the slot combination
protocol; see http://mop.lisp.se/dictionary.html#compute-slots.  This
can be done in 2.2.  It's all in Scheme now so hopefully it will be
easier to hack on.

I do not have any time to devote to this area, however, and as it's
possible to implement this in the stable series and it's not a
regression, I don't think it's a release blocker.

Andy

Guile-2.2 - goops slot redefinition at subclass level

[David Pirotte]

Hello Andy,

>  * GOOPS: are there incompatible changes that we think are bad?
>Subthread :)

2-  slot redefinition at subclass level

See bug#20423 for a full description, here is the summary of what I think we 
should
do:

When there are superclasses, a subclass can specify a slot that has 
already
been specified for a superclass. When this happens, the information in 
slot
options has to be combined. For the slot options listed above, either 
the
option in the subclass overrides the one in the superclass or there is a
union:

   :ACCESSOR  -  union
   :INITARG   -  union
   :INITFORM  -  overrides

Tbh, I'm not interested in the justification upon why 'things' are the way are 
in
goops now wrt this problem, let's save our energy here. I'd like 'things' to 
change
wrt this problem so we implement the clos protocol, ide4ally, that would happen 
in
guile-2.2 'already'.

Happy Hacking,
David


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