Am 19.11.2010 um 18:56 schrieb Hans Hagen:
> or maybe:
>
> \unprotected\unexpanded\def\doinstalldefinehandler#1#2#3#4#5#6#7%
> {\unexpanded\def#2{\dotripleempty#5}%
> \newtoks#6%
> \newtoks#7%
> \def#5[##1][##2][##3]%
> {\edef#4{##1}%
> \the#6% predefine
> \ifthirdargument
> \getparameters[#1#4][\s!parent=#1##2,##3]%
> \else\ifsecondargument
> \getparameters[#1#4][\s!parent=#3,##2]
> \fi\fi
> \the#7}}
No, because you need \doifassignment. Your code allows only
\define...[new][old][..=..]
and
\define...[new][..=..]
but it’s not possible to write
\define...[new][old]
because „new“ won’t use „old“ as parent with this defintion.
Wolfgang
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