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From: sinkwitz@ifi.unizh.ch (Rainer Sinkwitz)
Newsgroups: comp.sys.sgi
Subject: Re: C++, Templates, Preprocessor on the SGI (cfront)
Message-ID: <1991Jun28.074909.23230@ifi.unizh.ch>
Date: 28 Jun 91 07:49:09 GMT
References: <9106272305.AA10159@enuxha.eas.asu.edu>
Sender: sinkwitz@ifi.unizh.ch (Rainer Sinkwitz)
Reply-To: sinkwitz@ifi.unizh.ch (Rainer Sinkwitz)
Organization: University of Zurich, Department of Computer Science
Lines: 35


In article <9106272305.AA10159@enuxha.eas.asu.edu>, nwatson@ENUXHA.EAS.ASU.EDU (Nathan F. Watson) writes:
> I am using cfront (AT&T C++) on an SGI, and would like to use the
> '##' (concatenator) preprocessor 'statement' when defining a template.
> from my understanding, a file
> 
>   #define concat(a,b) a##b
>   concat(asdf,jkl)
> 
> should produce the file
> 
>   asdfjkl
> 
> after preprocessing.  I've tried variations of the above (e.g.
> putting spaces before, after the "##").  What do I need to do
> to allow this?  Forgive me if the question is frequently asked,
> as I'm new to C++.
> 
> ---------------------------------------------------------------------
> Nathan F. Watson                             Arizona State University
> nwatson@enuxha.eas.asu.edu                Computer Science Department
> "Remember:  No matter where you go, there you are." - Mr. B. Banzai

Sometime ago a saw a thing like the following. It works with the ordinary
C-Preprocessor and should also work with C++ :

#define IDENT(x) x
#define concat(a,b) IDENT(a)b

Greetings...
-- 

Rainer Sinkwitz            | E-mail: sinkwitz@ifi.unizh.ch
Dept. of Computer Science  |    sinkwitz%ifi.unizh.ch@relay.eu.net
University of Zuerich      |     {backbone}!mcsun!unizh!sinkwitz