nalaginrut <nalagin...@gmail.com> writes:
> hi all!
> I got a question. Is there any approach to define a "private"
> vars/methods in the GOOPS? Or it's impossible? I didn't find any
> "private" info in the GOOPS manual.
Hi there!
In Guile, the visibility of identifiers - including any functions you've
defined to get and set GOOPS slots - is controlled by the module system,
and is completely orthogonal to anything specific to GOOPS.
However, the module system can't prevent any code from doing
(slot-ref obj 'some-slot-that-should-be-private)
once it has OBJ, and knows that OBJ has a slot named
some-slot-that-should-be-private.
(In effect because slot names live in a different namespace from that of
identifiers, and which isn't connected to the module system.)
If you can determine at runtime whether or not any given slot access is
allowed - perhaps based on (current-module) - it should be possible to
enforce this by defining a new kind of slot #:allocation and putting
that runtime check in the #:slot-ref function.
Regards,
Neil
