Copyright (C) 1992, Digital Equipment Corporation                         
 All rights reserved.                                                      
 See the file COPYRIGHT for a full description.                            
 Last modified on Mon Jul 25 11:53:25 PDT 1994 by detlefs                  
      modified on Tue Feb 11 20:48:45 PST 1992 by muller                   

SetList is a generic interface defining sets of Elem.T's, implemented as linked lists. This implementations is appropriate only for small sets.

WHERE Elem.T is a REF type and contains

      PROCEDURE Equal(e1, e2: Elem.T): BOOLEAN;
ElemSet = Set(Elem).

Equal must be an equivalence relation.

Equal may be declared with a parameter mode of either VALUE or READONLY, but not VAR.

  Public = ElemSet.T OBJECT METHODS
    init(): T;
  T <: Public;
  Iterator <: ElemSet.Iterator;
If s is an object of type SetDefault.T, the expression

creates a new, empty set.

The call s.toRefList() returns a RefList.T whose elements include an element from each of the equivalence classes in set(s), and no other elements.

END SetList.