two-way-stream

two-way-stream System Class

Class Precedence List:

two-way-stream, stream, t

Description:

A bidirectional composite stream that receives its input from an associated input stream and sends its output to an associated output stream.

See Also:

make-two-way-stream, two-way-stream-input-stream, two-way-stream-output-stream input-stream-p, output-stream-p Function

Syntax:

input-stream-p stream → generalized-boolean

output-stream-p stream → generalized-boolean

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.

Expanded Reference: two-way-stream

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(two-way-stream )