fn uninstall_system_changed_callback()

in src/backend/mod.rs [4537:4565]

• 25 lines of code
• 7 McCabe index (conditional complexity)

    fn uninstall_system_changed_callback(&mut self) -> Result<()> {
        self.debug_assert_is_on_stream_queue();
        if self.stm_ptr.is_null() {
            assert!(
                self.default_output_listener.is_none() && self.default_input_listener.is_none()
            );
            return Ok(());
        }

        let stm = unsafe { &(*self.stm_ptr) };

        if self.default_output_listener.is_some() {
            let r = stm.remove_device_listener(self.default_output_listener.as_ref().unwrap());
            if r != NO_ERR {
                return Err(Error::error());
            }
            self.default_output_listener = None;
        }

        if self.default_input_listener.is_some() {
            let r = stm.remove_device_listener(self.default_input_listener.as_ref().unwrap());
            if r != NO_ERR {
                return Err(Error::error());
            }
            self.default_input_listener = None;
        }

        Ok(())
    }