From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Borland library macro equivalent?
Date:	Thu, 24 Oct 1996 00:34:49 -0700
Organization:	Three pounds of chaos and a pinch of salt
Lines:	33
Message-ID:	<326F1C19.1F4F@cs.com>
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 961023132054 DOT 7645C-100000 AT is> <326EE107 DOT 1659 AT cs DOT com>
Reply-To:	fighteer AT cs DOT com
NNTP-Posting-Host:	ppp101.cs.com
Mime-Version:	1.0
To:	eliz AT is DOT elta DOT co DOT il
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

John M. Aldrich wrote:
> 
> Eli Zaretskii wrote:
> >
> > Ha!  That's GCC we are using, remember?  We don't need to suffer from no
> > steenking double-evaluating compilers anymore:
> >
> >         #define max(a,b) ({ typeof(a) _tmp_a = (a); \
> >                             typeof(b) _tmp_b = (b); \
> >                             (_tmp_a > _tmp_b) ? _tmp_a : _tmp_b; })
> 
> Is that C or C++ you're talking about?  I thought only C++ let you
> declare variables anywhere other than at the beginning of a block.  Or
> is this a special extension to the macro facility?
> 
> Hmm, I guess I'd better go look through the docs some more.  ;)

Woops!  I looked at the macro again after posting this message (well, I
tried to stop it, but it obviously slipped in anyway...), and I saw what
I missed the first time - those are braces in there, not parentheses. 
It's kinda hard to see in the Courier font.  :)

Anyway, that's a really neat trick, Eli, and it definitely would work. 
But do I take it that _only_ GNU C supports statement blocks in any
expression?  Seems like a fairly logical thing, really.

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