open-stream-p [Function]

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 a with-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.

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