make-two-way-stream

ToC

Allegro CL

ANSI Common Lisp

21 Streams

21.2 Dictionary of Streams

21.2.42 make-two-way-stream

Function

Syntax:

make-two-way-stream input-stream output-stream

two-way-stream

Arguments and Values:

input-stream - a stream.

output-stream - a stream.

two-way-stream - a two-way stream.

Description:

Returns a two-way stream that gets its input from input-stream and sends its output to output-stream.

Examples:

 (with-output-to-string (out)
    (with-input-from-string (in "input...")
      (let ((two (make-two-way-stream in out)))
        (format two "output...")
        (setq what-is-read (read two)))))  "output..."
 what-is-read   INPUT...

Exceptional Situations:

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

Allegro CL Implementation Details:

None.