make-two-way-stream (ANSI and GNU Common Lisp Document)

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#### 21.2.42 make-two-way-stream [Function]

`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.