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Posting-Version: version B 2.10.2 9/18/84; site utcsri.UUCP
Path: utzoo!utcsri!greg
From: greg@utcsri.UUCP (Gregory Smith)
Newsgroups: net.lang.c
Subject: Re: swap() macro
Message-ID: <3007@utcsri.UUCP>
Date: Fri, 20-Jun-86 11:38:24 EDT
Article-I.D.: utcsri.3007
Posted: Fri Jun 20 11:38:24 1986
Date-Received: Fri, 20-Jun-86 11:41:40 EDT
References: <1201@brl-smoke.ARPA>
Reply-To: greg@utcsri.UUCP (Gregory Smith)
Organization: CSRI, University of Toronto
Lines: 23
Summary: 

In article <1201@brl-smoke.ARPA> Schauble@MIT-MULTICS.ARPA (Paul Schauble) writes:
>Can someone construct a version that makes
>
>    int *a, *b;
>    swap (*a++,*b++);
>
>work right?
>
#define swap( a,b ) { int *p1,*p2,t;\
	p1= &(a); p2= &(b); t= *p1;*p1= *p2;*p2=t;}

No, it isn't pretty.
how about:

#define swap(a,b) fswap(&(a),&(b))
fswap(a,b) int *a,*b;
{	etc.


-- 
"Shades of scorpions! Daedalus has vanished ..... Great Zeus, my ring!"
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Greg Smith     University of Toronto      UUCP: ..utzoo!utcsri!greg