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- To: common-lisp@SAIL.STANFORD.EDU
- Subject: Synonym streams
- From: DON%atc.bendix.com@RELAY.CS.NET
- Date: Wed, 23 Sep 87 15:34 EDT
Is a synonym-stream a stream? Can a stream be a synonym of a synonym-stream?
On the LMI, I tried
(defvar *describe-output* (make-synonym-stream '*standard-output*))
Because *standard-output* is by default a synonym of *terminal-io*, *describe-
output* became a synonym for a synonym. When I tried printing to
*describe-stream*, the system hung. It did not hang if I used *terminal-io*
in place of *standard-output*.
LMI's technical support agreed that in spirit it should work; however, CLtL
is ambiguous or at least not complete.
The problem, of course, is that if a synonym-stream is a stream but cannot
be the synonym for another stream, then there must be some function for
testing whether a stream is a synonym or a real stream. (synonym-stream-p).
Do other systems support using *standard-output* as a synonym?
Don Mitchell Don@atc.bendix.com
Bendix Aero. Tech. Ctr. Donfirstname.lastname@example.org
9140 Old Annapolis Rd. (301)964-4156
Columbia, MD 21045