aubio_log_function_t typedef
Logging function prototype, to be passed to ::aubio_log_set_function
\param level log level \param message text to log \param data optional closure used by the callback
See @ref utils/test-log.c for an example of logging function.
Implementation
typedef aubio_log_function_t
= ffi.Pointer<ffi.NativeFunction<aubio_log_function_tFunction>>;