Path: utzoo!utgpu!watserv1!watmath!att!rutgers!usc!samsung!uunet!dlogics!dsa
From: dsa@dlogics.COM (David Angulo)
Newsgroups: comp.lang.c++
Subject: Re: #defines....
Summary: Another use for #define
Message-ID: <605@dlogics.COM>
Date: 16 Jul 90 22:35:35 GMT
References: <37786@genrad.UUCP> <172@logo.procase.UUCP>
Organization: Datalogics Inc., Chicago
Lines: 38

> In article <37786@genrad.UUCP> slp@genrad.genrad.COM (Steven L. Peters) writes:
> >Just out of curiousity...
> >
> >With the C++ const, enum, and inline declarations, is it ever
> >necessary to use #define in a C++ program?  Stroustrup emphatically
> >says in _The C++ Programming Language_ not to use them if you don't
> >have to.  I'm wondering if you ever have to.  I can't think of a
> >single time where you would be forced to use a #define over const or
> >inline...
> >

Another example:  use it for compiler directives.  For example the
#include can be commented out like thus:

Module a:

	#ifndef a
	#define a
	...
	// rest of module a
	...
	#endif


module b:

	#ifndef a
	#include "a.h"
	#endif
	...
	// rest of module b


-- 
David S. Angulo                  (312) 266-3134
Datalogics                       Internet: dsa@dlogics.com
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