I've found Swift->C to interop very well with Swift. Yes, you get absolutely buried in UnsafeXXX wrapped types but it does do exactly what you expected. Going t

I've found Swift->C to interop very well with Swift. Yes, you get absolutely buried in UnsafeXXX wrapped types but it does do exactly what you expected. Going the other way is somewhat "herebe dragons" since @_cdecl is technically non-standardized (though there is a movement to standardize it [1]) but it definitely works fine. [1] https://forums.swift.org/t/formalizing-cdecl/40677/7 https://forums.swift.org/t/formalizing-cdecl/40677/7