Path: utzoo!attcan!uunet!mcsun!ukc!icdoc!sot-ecs!spqr
From: spqr@ecs.soton.ac.uk (Sebastian Rahtz)
Newsgroups: comp.text.tex
Subject: Re: #ifdef equivalent of selective inclusion for TeX/LaTeX???
Message-ID: <SPQR.90Oct20160238@manutius.ecs.soton.ac.uk>
Date: 20 Oct 90 15:02:38 GMT
References: <1990Oct18.021309.22918@cs.umn.edu> <40303@shemp.CS.UCLA.EDU>
Sender: spqr@ecs.soton.ac.uk
Organization: Southampton University Computer Science
Lines: 40
In-reply-to: kirkaas@ewa.cs.ucla.edu's message of 18 Oct 90 03:33:45 GMT

In article <40303@shemp.CS.UCLA.EDU> kirkaas@ewa.cs.ucla.edu (paul kirkaas) writes:


   \ifdef{adef1}
    I want to see the first line of text included.
   \fi
   \ifdef{adef2}
    I want to see the second line of text included.
   \fi

   The point is that rather than defining adef1 to some value and
   testing for it, I can still run the source through TeX EVEN IF
   adef1 is NOWHERE DEFINED.  I want that because I want to \include
its not quite the same, but here, for instance, is code which takes
various actions dependent on the value of \driver@setup, and starts by
checking to see if it defined at all. \@ifundefined is LaTeX-ese, and
needs to be in a style file or enclosed by \makeatletter ....
\makeatother. 

\@ifundefined{driver@setup}%
{
\typeout{WARNING *** driver setup codes are unknown in this setup ***}
}
{
\typeout{Driver type \the\driver@setup}
\ifcase\driver@setup
     % case 0
\typeout{case 0}
\or  % case 1
\typeout{case 1}
\or  % case 2
\else
\typeout{WARNING *** This driver setup is unknown -}
\fi
}

--
Sebastian Rahtz                        S.Rahtz@uk.ac.soton.ecs (JANET)
Computer Science                       S.Rahtz@ecs.soton.ac.uk (Bitnet)
Southampton S09 5NH, UK                S.Rahtz@sot-ecs.uucp    (uucp)