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I guess you'll have to share your code...

Hey yeah, you're right. Misinterpretation of my own problem, although it is solved now.

With your version however, I need to add the 'struct' keyword everywhere (this wasn't of course the case with a void*), but it does give more type security.
But it works (and without the extra...

Is it necessary to have this separate "private" header file?
Can't I just declare the struct in the c-file?

I have been forced into programming C++ for years and now I am coming back to C11 which is quite new to me after having only known C89 before coming to C++. Still... as a hardcore assembler...