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  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.

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