1 ! Copyright (C) 2009 John Benediktsson
2 ! See https://factorcode.org/license.txt for BSD license
3 USING: accessors sequences ;
6 TUPLE: frozen { seq read-only } ;
10 M: frozen virtual@ seq>> ;
12 M: frozen virtual-exemplar seq>> ;
14 M: frozen length seq>> length ;
16 INSTANCE: frozen virtual-sequence
18 INSTANCE: frozen immutable-sequence