# [texhax] testing the document class

Tue Feb 24 10:10:17 CET 2009

```Christian Bird wrote:
> Hi all,
>
> I'm trying to define a command that changes it's behavior depending on
> whether the class file defines chapters or not.  Is there an easy way to
> test for whether a macro is defined?  I'd like to do something like this:
>
> \newcommand{\todo}[2][]
> \stepcounter{TodoCounter}
> \ifx <\chapter is defined>
> #2}
> \else
> #2}
> \fi
> }
>
> Can anyone let me know what the correct way to test for this is?  Thanks!
>
> -- Chris
>
>
>
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>
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