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From: andy@rocky.STANFORD.EDU (Andy Freeman)
Newsgroups: comp.lang.c
Subject: Re: typeof isn't enough to define swap correctly
Message-ID: <576@rocky.STANFORD.EDU>
Date: Fri, 11-Sep-87 02:36:17 EDT
Article-I.D.: rocky.576
Posted: Fri Sep 11 02:36:17 1987
Date-Received: Sat, 12-Sep-87 16:38:21 EDT
References: <557@rocky.STANFORD.EDU> <1880@sol.ARPA> <109@umigw.MIAMI.EDU> <2019@sfsup.UUCP> <2105@sol.ARPA>
Reply-To: andy@rocky.UUCP (Andy Freeman)
Organization: Stanford University Computer Science Department
Lines: 20

In article <2105@sol.ARPA> crowl@cs.rochester.edu (Lawrence Crowl) writes:
>Let's try again.  I will ignore points 1 and 2 because they are easy.  I
>will ignore points 3, 4 and 5 because they essentially cannot be fixed.
>I will try to address points  6, 7, and 8.

Like I said, it is probably impossible to write a correct swap macro.
I'm glad you knew yours was wrong before you posted it.  BTW - your
concat macro doesn't work in all legal implementations of cpp.  Changing
it to the ANSI c feature designed for that problem doesn't help - your
definition doesn't handle point 6 correctly.

At least it handles swap(a[i],b[j]), a version someone posted with the
concat bug didn't....

-andy
-- 
Andy Freeman
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