What's a POS??
Mon, 12 May 1997 11:19:07 -0700
> Could you explain what exactly a transaction can look like in
That is the user API.
> In what way is "pointed to by existing persistent objects" different
> from the above "Writing a transient value into the slot of a
> persistent instance makes it persistent."?
Good question, I wasn't clear. Instances of non-persistent classes
can't be persistent. AllegroStore generates an exception if this is
(defclass transient () (slot1) )
(defclass persistent () (slot1) (:metaclass astore:persistent-standard-class))
;; not allowed, generates error
(setf (slot-value (make-instance 'persistent) 'slot1)
There are reasons for this. To lift the restriction requires a
different implementation than AllegroStore uses to make things persistent.
-Kelly Edward Murray