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| ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams
21.2.9 input-stream-p, output-stream-p | Function
  Syntax: input-stream-p stream generalized-boolean output-stream-p stream generalized-boolean Arguments and Values: stream - a stream. generalized-boolean - a generalized boolean. Description: input-stream-p returns true if stream is an input stream; otherwise, returns false. output-stream-p returns true if stream is an output stream; otherwise, returns false. Examples:
       (input-stream-p *standard-input*)  true
       (input-stream-p *terminal-io*)  true
       (input-stream-p (make-string-output-stream))  false

       (output-stream-p *standard-output*)  true
       (output-stream-p *terminal-io*)  true
       (output-stream-p (make-string-input-stream "jr"))  false
Exceptional Situations: Should signal an error of type type-error if stream is not a stream. Allegro CL Implementation Details: None.

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