Oh, my bad! I don't know how I missed the definition of foo().
As for *c_void vs opaque {}, AFAIK they're functionally identical, but opaque {} allows you to define a strong type alias whereas *c_void will accept just about any pointer. In retrospect, it probably doesn't matter very much in this specific case, but it seems good form anyway.
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Oh, my bad! I don't know how I missed the definition of
foo().As for
*c_voidvsopaque {}, AFAIK they're functionally identical, butopaque {}allows you to define a strong type alias whereas*c_voidwill accept just about any pointer. In retrospect, it probably doesn't matter very much in this specific case, but it seems good form anyway.