input-stream-p, output-stream-p (Function)

Syntax:

Arguments and Values:

stream—a stream.

generalized-boolean—a generalized boolean.

Description:

input-stream-p returns true if stream is an input stream; otherwise, returns false.

output-stream-p returns true if stream is an output stream; otherwise, returns false.

Examples:

 (input-stream-p *standard-input*) → true
 (input-stream-p *terminal-io*) → true
 (input-stream-p (make-string-output-stream)) → false

 (output-stream-p *standard-output*) → true
 (output-stream-p *terminal-io*) → true
 (output-stream-p (make-string-input-stream "jr")) → false

Exceptional Situations:

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