> I find it strange, as it's possible to overwrite a macro, just like
> variables, and to check if a macro is defined using #ifdef, just like
> variables, but to undefine it isn't possible for some reason (or is it?).

Have you tried #undef ???
If that doesn't work, perhaps you could redefine it after it is called
based on a flag set within the macro?

N Shomber

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