@@ -24,10 +24,11 @@
  * @brief A class for providing standard input, output and error as OFStream.
  *
  * The global variables @ref of_stdin, @ref of_stdout and @ref of_stderr are
  * instances of this class and need no initialization.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFStdIOStream: OFStream
 {
 	int  _fd;
 	bool _atEndOfStream;
 }