def cffi(self):
        """
        A cffi function pointer representing the C callback.
        """
        import cffi
        ffi = cffi.FFI()
        # cffi compares types by name, so using precise types would risk
        # spurious mismatches (such as "int32_t" vs. "int").
        return ffi.cast("void *", self.address)

        A cffi function pointer representing the C callback.
        
numba/core/ccallback.py