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  ANSI Common Lisp   21 Streams   21.2 Dictionary of Streams

21.2.10 interactive-stream-p Function

Syntax:
interactive-stream-p stream    generalized-boolean

Arguments and Values:
stream - a stream.

generalized-boolean - a generalized boolean.

Description:
Returns true if stream is an interactive stream; otherwise, returns false.

Examples:
 (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))))

Exceptional Situations:
Should signal an error of type type-error if stream is not a stream.

See Also:
Section 21.1 Stream Concepts

Allegro CL Implementation Details:
None.

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