Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!uwm.edu!ux1.cso.uiuc.edu!csrd.uiuc.edu!s41.csrd.uiuc.edu!eijkhout
From: eijkhout@s41.csrd.uiuc.edu (Victor Eijkhout)
Newsgroups: comp.text.tex
Subject: Re: making characters active
Message-ID: <1991Mar25.201912.25816@csrd.uiuc.edu>
Date: 25 Mar 91 20:19:12 GMT
References: <DOMEN.91Mar25145654@euler.crin.fr>
Sender: news@csrd.uiuc.edu (news)
Organization: UIUC Center for Supercomputing Research and Development
Lines: 16

domen@euler.crin.fr (Eric Domenjoud) writes:

>I want to write a macro with 2 arguments, the first one being a single
>characters, which makes #1 active and defines it as #2. I tried    

>    \def\makeactive#1#2{\catcode`\#1=\active \let#1{#2}}

>but it doesn't work. Does anybody have an idea ? 

Start with an active character, say the tilde; write:

\catcode`#1=\active \tempcount=\uccode`\~
\uccode`\~=`#1 \uppercase{\let~}{#2}
\uccode`\~=\tempcount

Victor.