Path: utzoo!yunexus!geac!syntron!jtsv16!uunet!auspex!guy
From: guy@auspex.UUCP (Guy Harris)
Newsgroups: comp.lang.c
Subject: Re: Efficient coding considered harmful?
Message-ID: <341@auspex.UUCP>
Date: 28 Oct 88 16:15:39 GMT
Article-I.D.: auspex.341
References: <3105@hubcap.UUCP> <34112@XAIT.XEROX.COM> <1700@dataio.Data-IO.COM> <8630@smoke.ARPA> <1704@dataio.Data-IO.COM> <119@twwells.uu
Reply-To: guy@auspex.UUCP (Guy Harris)
Organization: Auspex Systems, Santa Clara
Lines: 12

>:     o   Use the ^ operator because many times,
>:                 a = !a;
>:         should really be,
>:                 a ^= 1;
>
>However, some machines can't do ^ very well, so take care.

And some code for reasons of, well, *microefficiency* may rely on the
fact that any non-zero value, not just 1, is considered "true" by C; the
only safe way of inverting such a boolean is with "a = !a". 

Too bad C doesn't have a Boolean type....