generalized-boolean—a generalized boolean.
Returns true if stream is an interactive stream; otherwise, returns false.
(when (> measured limit) (let ((error (round (* (- measured limit) 100) limit))) (unless (if (interactive-stream-p *query-io*) (yes-or-no-p "The frammis is out of tolerance by ~D%.~@ Is it safe to proceed? " error) (< error 15)) ;15% is acceptable (error "The frammis is out of tolerance by ~D%." error))))
Should signal an error of type
type-error if stream is not a stream.
Section 21.1 (Stream Concepts)