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Path: utzoo!mnetor!seismo!ll-xn!ames!hc!hi!kurt
From: kurt@hi.UUCP (Kurt Zeilenga)
Newsgroups: comp.unix.wizards,comp.unix.questions
Subject: Re: need cpp macros to concatenate names
Message-ID: <6129@hi.UUCP>
Date: Tue, 5-May-87 05:38:17 EDT
Article-I.D.: hi.6129
Posted: Tue May  5 05:38:17 1987
Date-Received: Wed, 6-May-87 05:01:46 EDT
References: <634@calma.UUCP>
Reply-To: kurt@hi.UUCP (Kurt Zeilenga)
Distribution: na
Organization: U. of New Mexico, Albuquerque
Lines: 48
Xref: mnetor comp.unix.wizards:2152 comp.unix.questions:2144

In article <634@calma.UUCP> clark@calma.UUCP (Al Clark) writes:
>Has anyone had any success using a macro to concatenate two words; eg:
>concat(one, word)  to generate the the single word 'oneword', as in the
>following code segment.

Yes.

>#define prefix my

This makes it very hard! 

>#define concat(x,y) x\
>y
>
>main()
>{
>	long *concat(prefix,file);
>}
>

I've used in the pass (on a SUN3/160C with Rel. 3.3):

#define cat(x,y)	x/**/y
cat(a,b);

You get:

ab

But if you try to #define a or b, it don't work.
A friend (bret@hi.uucp) showed me:

#define prefix my
#define zz **
#define concat(x,y)	x/zz/y

	long *concat(prefix,file)

So, what does your compiler do with "long * my/**/file;"?  Ours
turns comments into "white space" . . . as in K&R.  Doesn't do
you any good, but it has its (ab)uses.

Well, I tried....

-- 
	Kurt Zeilenga	 (zeilenga@hc.dspo.gov)		I want my talk.flame!

	"So long, Mom, I'm off to drop the bomb..."