--| Copyright (c) 1993-2006 University of Southern California and contributors. --| All rights reserved. --| Your use of this work is governed under the terms of the GNU General --| Public License version 2. class SHARED feature ok: BOOLEAN_REF is once !!Result; end; set_ok is do ok.set_item (True); end unset_ok is do ok.set_item (False); end end