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STREAMP and CLOS
Date: Mon, 24 Feb 1992 12:51 EST
From: email@example.com (Bernd Wild)
We got a surprising result when applying STREAMP to an arbitrary CLOS
instance. It always returns T. This behavior has changed from Genera
8.0 to 8.1. While in 8.0 only "real" streams resulted in a T-value in
8.1 this can be observed for every instance.
(defclass aa ()())
(setf my-aa (clos:make-instance 'aa))
(streamp my-aa) => T
We looked at the implementation of STREAMP: theu send a FLAVORS
:WHICH-OPERATIONS message to the CLOS instance and obtain a message
list which always contains the symbols :TYO and TYI which are
significant for a stream.
So, what's the correct predicate for checking anything for stream or
I can't reproduce this. I did
(clos:defclass foo () ())
(setq a (clos:make-instance 'foo))
(streamp a) => NIL
(send a :which-operations) => (:SEND-IF-HANDLES :WHICH-OPERATIONS :OPERATION-HANDLED-P :PRINT-SELF)
I'm running Genera 8.1.1, in case you're running plain 8.1. I don't
think it should make a difference, though; none of the CLOS patches in
the ECO seem to relate to this.