Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!brl-adm!adm!neville@ads.arpa
From: neville@ads.arpa
Newsgroups: comp.lang.c
Subject: Re: cpp macro expansion
Message-ID: <6996@brl-adm.ARPA>
Date: Tue, 21-Apr-87 09:29:30 EST
Article-I.D.: brl-adm.6996
Posted: Tue Apr 21 09:29:30 1987
Date-Received: Wed, 22-Apr-87 02:46:32 EST
Sender: news@brl-adm.ARPA
Lines: 15


There is a potentially non-portable preprocessor feature that most of
the GLUE(a,b) macros that have been suggested suffer from.

Most such macros that people use look like
     #define PASTE_IT(left,right)  left/**/right

What some people may not realize is that comments are sort of "doubly-
defined" in that they are defined as part of the C language itself,
but most C preprocessors go ahead and strip comments themselves.  There
is no reason that i can see to expect that all preprocessors will do
this.  If a C comment gets passed through to the *compiler*, what
happens.  You just can't count on hacks like this.

                            -neville