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From: guido@mcvax.uucp (Guido van Rossum)
Newsgroups: net.lang.c
Subject: Re: Disappearing function call
Message-ID: <7098@boring.mcvax.UUCP>
Date: Sat, 11-Oct-86 08:30:59 EDT
Article-I.D.: boring.7098
Posted: Sat Oct 11 08:30:59 1986
Date-Received: Mon, 13-Oct-86 00:41:51 EDT
References: <357@cullvax.UUCP>
Reply-To: guido@boring.uucp (Guido van Rossum)
Organization: "Stamp Out BASIC" Committee, CWI, Amsterdam
Lines: 25
Apparently-To: rnews@mcvax

In article <357@cullvax.UUCP> drw@cullvax.UUCP (Dale Worley) writes:
>What I want to do is to write a function call of a variable number of
>arguments:
>
>	debug(x, y, z, ...)
>
>that will generate no code when the symbol DEBUG is not defined, but
>generate a call of some function (say, debug_()) when it is.  If
>Is there a good way to do this?

If you are willing to write extra parentheses but want them to match,
write this:

	#ifdef DEBUG
	#define debug(x) debug_ x
	#else
	#define debug(x) /* empty */
	#endif

and call as follows:

	debug((x, y, z, ...));

-- 
	Guido van Rossum, CWI, Amsterdam <guido@mcvax.uucp>