# [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
macro:

\newcommand{\buffer}{\relax}
\makeatletter
\newcommand{\fillbuffer}[1]{%
\if\buffer\relax