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From: brnstnd@stealth.acf.nyu.edu
Newsgroups: comp.lang.c
Subject: Re: Three states
Message-ID: <5880:Apr720:15:1490@stealth.acf.nyu.edu>
Date: 7 Apr 90 20:15:14 GMT
References: <18722.2618C528@urchin.fidonet.org> <1990Apr4.154552.14767@aqdata.uucp> <16388@haddock.ima.isc.com>
Reply-To: brnstnd@stealth.acf.nyu.edu (Dan Bernstein)
Distribution: usa
Organization: IR
Lines: 12
X-Original-Subject: BOOLEAN as enum

In article <16388@haddock.ima.isc.com> karl@haddock.ima.isc.com (Karl Heuer) writes:
> I can imagine a situation, e.g. a variant of ctype where is_lower(c) returns
> TRUE or FALSE normally, or ERROR if c is out of range.  But I would think
> that this would be rare usage, and not worthy of being part of the type.

Bad example: somehow I never find that I already know isascii(c) before
calling isdigit(c), so for ``portability'' I always have to use both.
So it wouldn't be rare usage. On the other hand, I also see absolutely
no use for a three-valued isdigit above a simple isascii && isdigit; I
suspect most other programmers agree.

---Dan