On Saturday, 2 November 2019 at 19:42:54 UTC, Luh wrote:
So I think I just can't. :(

Is that `void* c` in the callback a context pointer by any chance?
That's a common thing in C callbacks precisely for purposes like this. You can cast your class to a void* when you register the callback and in the callback function cast it back to a class and call process on that.

I don't know what C library you're working with so can't give you specifics.

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