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| ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams
21.2.48 get-output-stream-string | Function
  Syntax: get-output-stream-string string-output-stream string Arguments and Values: string-output-stream - a stream. string - a string. Description: Returns a string containing, in order, all the characters that have been output to string-output-stream. This operation clears any characters on string-output-stream, so the string contains only those characters which have been output since the last call to get-output-stream-string or since the creation of the string-output-stream, whichever occurred most recently. Examples:
       (setq a-stream (make-string-output-stream)
              a-string "abcdefghijklm")  "abcdefghijklm"
       (write-string a-string a-stream)  "abcdefghijklm"
       (get-output-stream-string a-stream)  "abcdefghijklm"
       (get-output-stream-string a-stream)  ""
Side Effects: The string-output-stream is cleared. Exceptional Situations: The consequences are undefined if stream-output-string is closed. The consequences are undefined if string-output-stream is a stream that was not produced by make-string-output-stream. The consequences are undefined if string-output-stream was created implicitly by with-output-to-string or format. See Also: make-string-output-stream Allegro CL Implementation Details: None.

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