Function lv_obj_check_type 

pub unsafe extern "C" fn lv_obj_check_type(
    obj: *const lv_obj_t,
    class_p: *const lv_obj_class_t,
) -> bool

Check the type of obj. @param obj pointer to an object @param class_p a class to check (e.g. lv_slider_class) @return true: class_p is the obj class.