Path: utzoo!utgpu!water!watmath!clyde!bellcore!faline!ulysses!allegra!mit-eddie!ll-xn!ames!sdcsvax!ucsdhub!hp-sdd!hplabs!hpcea!hpfcdc!boemker
From: boemker@hpfcdc.UUCP
Newsgroups: comp.lang.c
Subject: Re: comma operator
Message-ID: <5080013@hpfcdc.HP.COM>
Date: 14 Jan 88 23:16:16 GMT
References: <3819@sigi.Colorado.EDU>
Organization: HP Ft. Collins, Co.
Lines: 10
Posted: Thu Jan 14 18:16:16 1988

> Perhaps the most common use is when you're writing a macro:
> 	#define SWAP(a, b, temp)  temp=a, a=b, b=temp
> You can't write this the "obvious" way:
> 	#define SWAP(a, b, temp)  {temp=a, a=b, b=temp}
> because, someone will write
> 	if (test(a, b)) SWAP(a, b, temp);
> 	else abort();

OK, I'm feeling like a brick... Why can't I write it the
"obvious" way?