[XeTeX] newcommand with optional arguments

Manuel Pégourié-Gonnard mpg at elzevir.fr
Tue Mar 4 22:33:46 CET 2008


Morten Høgholm a écrit :
> *The* bulletproof (and purely expandable) method of testing whether an
> argument is empty is this:
> 
> \long\def\tlist at if@empty at nTF #1{%
>   \expandafter\ifx\expandafter\\\detokenize{#1}\\%

By the way, I always wonder since how long e-TeX (or pdfTeX) is the default
engine for TeX distributions. I know some people still stuck with teTeX2 at
work: are they going to have problems with \detokenize ?

Manuel.


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