Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!ucsd!ucbvax!CIM-VAX.HONEYWELL.COM!dscargo
From: dscargo@CIM-VAX.HONEYWELL.COM ("DAVE CARGO")
Newsgroups: comp.lang.icon
Subject: cset comparisons
Message-ID: <8909121409.AA06843@megaron.arizona.edu>
Date: 12 Sep 89 14:29:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: inet
Organization: The Internet
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I found myself doing some cset manipulations for a program and then realized
that I couldn't remember what kinds of comparison operators work for csets.
So I tried looking in the Icon book.  Nothing seemed to be clearly indicated.
At a guess csets are converted to strings for comparisons.  Is that the way
it works?  Is it unavoidable?

I wanted to see if the intersection of two csets was empty or not, e. g.,

if a ** b == '' then ...

but then I realized that I wasn't sure if == was the right operator.
(Not that I think that every type needs its own equality operator.)
Can someone provide some guidance (what to use and why Icon wants it that way)?

David S. Cargo
DSCARGO@CIM-VAX.HONEYWELL.COM