CLHS: Function OPEN-STREAM-P

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Function OPEN-STREAM-P

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

Examples:

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

Side Effects: None.

Affected By:

close.

Exceptional Situations:

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

See Also: None.

Notes: None.

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- STREAM-ACCESS:ADD-TYPES-ACCESSORS

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