Function fltk_sys::button::Fl_Toggle_Button_set_deletion_callback

pub unsafe extern "C" fn Fl_Toggle_Button_set_deletion_callback(
    self_: *mut Fl_Toggle_Button,
    arg1: Option<unsafe extern "C" fn(arg1: *mut Fl_Widget, arg2: *mut c_void)>,
    data: *mut c_void
)