'isa' keyword

Paul Rubin http
Thu Sep 1 09:58:54 CEST 2005


"talin at acm dot org" <viridia at gmail.com> writes:
> membership within a container -- instead we're testing for membership
> with a type hierarchy, where 'type' can be defined to mean whatever the
> programmer wants.

Well, if "type" means a (possibly infinite) set of objects, then you
can use "in".  E.g, "3 in int".



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