dispenser.sa

 
---------------------------> Sather 1.1 source file <--------------------------
-- dispenser.sa: Dispenser abstraction
-- Author: Benedict A. Gomes <gomes@samosa.ICSI.Berkeley.EDU>
-- Copyright (C) 1995, International Computer Science Institute
-- $Id: dispenser.sa,v 1.2 1996/04/09 10:04:50 borisv Exp $
--
-- COPYRIGHT NOTICE: This code is provided WITHOUT ANY WARRANTY
-- and is subject to the terms of the SATHER LIBRARY GENERAL PUBLIC
-- LICENSE contained in the file: Sather/Doc/License of the
-- Sather distribution. The license is also available from ICSI,
-- 1947 Center St., Suite 600, Berkeley CA 94704, USA.



abstract class $DISPENSER{ETP} < $CONTAINER{ETP},$STR 
abstract class $DISPENSER{ETP} < $CONTAINER{ETP},$STR is
   -- A dispenser is an abstraction that only permits the removal
   -- of one element at a time.
   -- This abstraction just permits the non-modifying operations
   -- and is mainly to organize the collection of classes (to ensure
   -- that they all have certain basic features like size).
   -- We do not currently believe that an abstract dispenser will show
   -- up in actual code...
   
   size: INT;
   -- Number of items in the dispenser
   
   current: ETP;
   -- Return the current item
   
   remove: ETP;		
   -- Return the current item and advance 
   
   elt!: ETP;
   -- Return the elements of the dispenser in some *undefined* order.
   -- Particular abstractions might define a stronger ordering relation
   
end;