Function g_signal_new_class_handler

pub unsafe extern "C" fn g_signal_new_class_handler(
    signal_name: *const i8,
    itype: usize,
    signal_flags: u32,
    class_handler: Option<unsafe extern "C" fn()>,
    accumulator: Option<unsafe extern "C" fn(*mut GSignalInvocationHint, *mut GValue, *const GValue, *mut c_void) -> i32>,
    accu_data: *mut c_void,
    c_marshaller: Option<unsafe extern "C" fn(*mut GClosure, *mut GValue, u32, *const GValue, *mut c_void, *mut c_void)>,
    return_type: usize,
    n_params: u32,
    ...
) -> u32