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From: levy@ttrdc.UUCP (Daniel R. Levy)
Newsgroups: net.lang.c
Subject: Re: swap() macro
Message-ID: <1007@ttrdc.UUCP>
Date: Sun, 22-Jun-86 23:43:58 EDT
Article-I.D.: ttrdc.1007
Posted: Sun Jun 22 23:43:58 1986
Date-Received: Wed, 25-Jun-86 03:09:40 EDT
References: <1201@brl-smoke.ARPA> <370@anasazi.UUCP>
Organization: AT&T, Computer Systems Division, Skokie, IL
Lines: 30

In article <370@anasazi.UUCP>, steve@anasazi.UUCP (Steve Villee) writes:
>> Can someone construct a version that makes
>>
>>     int *a, *b;
>>     swap (*a++,*b++);
>>
>> work right?
>>           Paul Schauble at MIT-Multics.arpa
>
>#define swap(x, y) \
>  if (1) \
>  { \
>    register int *xp, *yp, t; \
>    xp = &(x); \
>    yp = &(y); \
>	...
>--- Steve Villee (ihnp4!mot!anasazi!steve)

CAUTION.  This will fail on:

	register int i, j;
	swap(i,j);
-- 
 -------------------------------    Disclaimer:  The views contained herein are
|       dan levy | yvel nad      |  my own and are not at all those of my em-
|         an engihacker @        |  ployer or the administrator of any computer
| at&t computer systems division |  upon which I may hack.
|        skokie, illinois        |
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