open-stream-p (original) (raw)

ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams

Syntax:

open-stream-p stream generalized-boolean

Arguments and Values:

stream - a stream.

generalized-boolean - a generalized boolean.

Description:

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 awith-output-to-string, with-open-file,with-input-from-string, or with-open-stream form.

Examples:

(open-stream-p standard-input) true

Affected By:

close.

Exceptional Situations:

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

Allegro CL Implementation Details:

None.