pub unsafe extern "C" fn Fl_Simple_Counter_set_callback(
arg1: *mut Fl_Simple_Counter,
arg2: Fl_Callback,
arg3: *mut c_void,
)pub unsafe extern "C" fn Fl_Simple_Counter_set_callback(
arg1: *mut Fl_Simple_Counter,
arg2: Fl_Callback,
arg3: *mut c_void,
)