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  ANSI Common Lisp   21 Streams   21.2 Dictionary of Streams

21.2.11 open-stream-p Function

open-stream-p stream    generalized-boolean

Arguments and Values:
stream - a stream.

generalized-boolean - a generalized boolean.

Returns true if stream is an open stream; otherwise, returns false.

Streams are open until they have been explicitly closed with close, or until they are implicitly closed due to exit from a with-output-to-string, with-open-file, with-input-from-string, or with-open-stream form.

 (open-stream-p *standard-input*)  true

Affected By:

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

Allegro CL Implementation Details:

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