Path: utzoo!attcan!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!mailrus!ames!pasteur!ucbvax!decwrl!labrea!csli!gandalf
From: gandalf@csli.STANFORD.EDU (Juergen Wagner)
Newsgroups: comp.unix.wizards
Subject: Re: #defines with variable # arguments
Message-ID: <3913@csli.STANFORD.EDU>
Date: 16 May 88 19:47:49 GMT
References: <2855@phoenix.Princeton.EDU+ <2633@tekcrl.TEK.COM> <979@cresswell.quintus.UUCP> <980@cresswell.quintus.UUCP> <2918@phoenix.Princeton.EDU>
Reply-To: gandalf@csli.UUCP (Juergen Wagner)
Organization: Center for the Study of Language and Information, Stanford U.
Lines: 19

To put my five cents into this discussion:

I prefer to use a simple macro like
	# ifdef DEBUG
	#   define DBG	do_debug
	# else !DEBUG
	#   define DBG	if (0) do_debug
	# endif DEBUG
This will expand the lines of the form
	DBG(flag, "sorry, the flag is %d", flag);
into a line which calls my function do_debug only if DEBUG is set. Of course,
do_debug is a function with a variable number of arguments.

I know, there are applications where this is not suffifient, and I know one
can use double parens, ... This posting is a comment and not a dogma!

-- 
Juergen "Gandalf" Wagner,		   gandalf@csli.stanford.edu
Center for the Study of Language and Information (CSLI), Stanford CA