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Function INPUT-STREAM-P, OUTPUT-STREAM-P

Syntax

  • input-stream-p streamgeneralized-boolean
  • output-stream-p streamgeneralized-boolean

Arguments and Values

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

Side Effects

None.

Affected By

None.

Exceptional Situations

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

See Also

None.

Notes

None.