make-echo-stream (ANSI and GNU Common Lisp Document)

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#### 21.2.45 make-echo-stream [Function]

`make-echo-stream` input-stream output-stream ⇒ echo-stream

#### Arguments and Values::

input-stream—an input stream.

output-stream—an output stream.

echo-stream—an echo stream.

#### Description::

Creates and returns an echo stream that takes input from input-stream and sends output to output-stream.

#### Examples::

     (let ((out (make-string-output-stream)))
        (with-open-stream
            (s (make-echo-stream
                (make-string-input-stream "this-is-read-and-echoed")
                out))
          (read s)
          (format s " * this-is-direct-output")
          (get-output-stream-string out)))
    ⇒  "this-is-read-and-echoed * this-is-direct-output"

#### See Also::

echo-stream-input-stream , echo-stream-output-stream, make-two-way-stream