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From: john@leo.UUCP ( John McCurry)
Newsgroups: comp.lang.c
Subject: Re: Second question on #define
Message-ID: <1473@leo.UUCP>
Date: Wed, 4-Nov-87 13:00:35 EST
Article-I.D.: leo.1473
Posted: Wed Nov  4 13:00:35 1987
Date-Received: Sat, 7-Nov-87 10:19:05 EST
References: <10104@brl-adm.ARPA>
Organization: CCI CPD (Advanced Development), Irvine CA
Lines: 25
Summary: methods to expand variable names

In article <10104@brl-adm.ARPA>, ultra!wayne@ames.arpa (Wayne Hathaway) writes:
>   I have a large number of manifest constants of the form
>                     GREATBIGLONGPREFIX_SHORTTHING
> 
> I would like to have a macro accept only SHORTTHING as an argument but
> use the full constant name in the generated code.  I (naively) tried
>         #define   WIDGET(x)   printf("%d\n", GREATBIGLONGPREFIX_x)

Our compiler uses the "Reiser" (spelling?) version of cpp.  This version
uses /**/ for concatinating things - as in:

	#define  WIDGET(x)   printf("%d\n", GREATBIGLONGPREFIX_/**/x);
or
	#define  WIDGET(x)   printf("%d\n", x/**/_GREATBIGLONGSUFFIX);

I don't have access to an ANSI standard compiler but our local expert
says that
	PREFIX_##x  will (should) work.

I am not, by the way, a compiler guru - I just use the beasts.  Any
mistakes in the above posting are probably accidental.
-- 
<insert random witticism here>
John J. McCurry 
Computer Consoles Inc. CPD, Irvine, Ca.		uunet!ccicpg!leo!john