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From: guy@sun.UUCP
Newsgroups: net.lang.c++,net.lang.c
Subject: Re: System V preprocessor problem with <generic.h>
Message-ID: <3597@sun.uucp>
Date: Mon, 28-Apr-86 22:11:05 EDT
Article-I.D.: sun.3597
Posted: Mon Apr 28 22:11:05 1986
Date-Received: Fri, 2-May-86 06:34:34 EDT
References: <410@cit-vax.Caltech.Edu> <228@sfsup.UUCP>
Followup-To: net.lang.c
Distribution: net
Organization: Sun Microsystems, Inc.
Lines: 22
Xref: watmath net.lang.c++:173 net.lang.c:8758

> Try this fix for system V cpp:
> 
> 	#define name2(a,b)	a/**/b
> 	#define name3(a,b,c)	a/**/b/**/c
> 
> This works because the system V cpp strips the comments from the input.

So do earlier versions of Reiser's "cpp"; this is the "canonical" way of
concatenating two arguments to a macro, and is heavily used in 4BSD.  It
has, however, two problems:

	1) If you run your code through "lint", it won't work - "cpp"
	   is run by "lint" with the "-C" flag, which tells it not to
	   strip comments (for obvious reasons).

	2) It is not a guaranteed property of the C language, but a
	   quirk of the implementation, so it will not work in
	   general.
-- 
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.arpa