SdlAssertionHandlerDart typedef
        SdlAssertionHandlerDart =
     int Function(Pointer<SdlAssertData>  data, Pointer<NativeType>  userdata)
    
    
    
Implementation
typedef SdlAssertionHandlerDart =
    int Function(Pointer<SdlAssertData> data, Pointer<NativeType> userdata);