open-stream-p (Function)

Syntax:

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.