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Thank you for help and suggestions.

I don't want to declare the method static, because it should be different for every object. Anyway, I've found a solution.

For the given example:
I declare...

thanks, i see... ok, i will read this Tutorial.

Is there anybody who knows and wants to post an example how to use this class-function instead of any global (static) function?

greets
Christian

Hey,
How can I get this one work?
There is a class which gets a function f as an argument. This function is combined with other ones to a new function diff. So far it's fine.

Now I want to pass...