[texhax] testing the document class

[Lars Madsen]

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>
> \addcontentsline{tdo}{todo}{\textbf{\arabic{chapter}.\arabic{section}-\arabic{TodoCounter}:}
> #2}
> \else
> \addcontentsline{tdo}{todo}{\textbf{\arabic{section}-\arabic{TodoCounter}:}
> #2}
> \fi
> }
> 
> Can anyone let me know what the correct way to test for this is?  Thanks!
> 
> -- Chris
> 
> 
> 
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\@ifundefined{chapter}{is undefined}{is defined}

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/daleif