On Wed, Oct 22, 2008 at 09:22:35PM +0200, Andre Poenitz wrote:
> > I think that I remember to have read about so-called catcodes (or
> > whatever?) in TeX, which apparently make it possible to declare certain
> > characters as "active" so that further processing is possible whenever
> > the TeX scanner reads such character. I wonder if it is possible this way
> > to declare in the preamble that
> > "C" followed by "+", followed by "+"
> > is "active" and should be inherently substituted with something like
> > "\mbox{C+\hspace{-.5ex}+}}"
>
> Quick shot: [...]
Somewhat improved version:
\def\plus{+}
\catcode`\+=\active
\def\smallplusplus#1{\raisebox{0.6ex}{\tiny\plus\kern-.3ex\plus}}
\def+{\futurelet\nextchar\pluss}
\def\pluss{%
\ifx\nextchar+%
\let\next\smallplusplus%
\else%
\let\next\plus%
\fi%
\next}
And no, I can't explain it.
Andre'
