[texhax] if condition: is macro body empty?

Philip G. Ratcliffe philip.ratcliffe at uninsubria.it
Thu Feb 12 09:55:37 CET 2009

> for (pdf)latex I am looking for a way to check whether the 
> body of a macro is empty or not. At the moment, I use a 
> construct using \equal{}{<macro>}, but I have the impression 
> that during evaluation of this construct some ugly side 
> effects occur. I am sure there must be a better way.
> [snip]

This works too, doesn't need the "ifthen" package and shouldn't expand the

    \g at addto@macro{\buffer}{#1}%
    \g at addto@macro{\buffer}{\newline #1}%

Cheers,  Phil

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