[NTG-pdftex] Extensions: \pdf$foo or \$foo?

Heiko Oberdiek oberdiek at uni-freiburg.de
Fri Jul 1 15:16:01 CEST 2005


On Fri, Jul 01, 2005 at 09:11:13AM +0200, Pawel Jackowski wrote:

> >Heiko:
> >And what about packages, macros that are not released?
> >Documents are allowed to contain macro definitions. Thus
> >existing documents can break because of added new primitives[...]
> 
> Nope, since macros defined in the document will always override the 
> primitive meaning. The document will NOT crash and won't need a 
> primitive meaning of the clashed command, since was prepared before the 
> command was implemented.

Examples with a new primitive: \match

Szenario A: User defines macro:
  \newcommand{\match}{Hello World}
  ==> Error message, \match already defined.

Szenario B:
  \def\match!#1!#2!#3{...}

  Some package (hyperref, ...) uses the new primitive:
  \match{...}{...}
  ==> Document fails with: Use of \match doesn't match its definition.

Yours sincerely
  Heiko <oberdiek at uni-freiburg.de>
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