Re: Applicable GOOPS objects?

[BT Templeton]

Mark H Weaver <address@hidden> writes:

> Hello all,
>
> I was chatting with the folks working on Python-on-Guile, and it seems
> clear that they need the ability to create GOOPS objects that can
> emulate procedures.  Otherwise they will probably end up creating an
> entirely separate object system for Python, which would obviously be
> suboptimal.
>
> I think the most flexible approach is to add a standard generic function
> 'generic-apply' that gets called whenever someone tries to use a GOOPS
> object as a procedure.  I guess 'procedure?' should return true for a
> GOOPS object iff there exists an applicable method for 'generic-apply'.
>
> What do you think?

GOOPS defines an <applicable-struct-class> metaclass for this (similar
to AMOP's funcallable-standard-class):

scheme@(guile-user)> (define-class <foo> (<applicable-struct>))
scheme@(guile-user)> ((make <foo> #:procedure car) '(1 2))
$1 = 1

Would it work to simply have all Python metaclasses inherit from
<applicable-struct-class>?

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