pub unsafe extern "C" fn g_hash_table_new_full(
    hash_func: Option<unsafe extern "C" fn(_: *const c_void) -> u32>,
    key_equal_func: Option<unsafe extern "C" fn(_: *const c_void, _: *const c_void) -> i32>,
    key_destroy_func: Option<unsafe extern "C" fn(_: *mut c_void)>,
    value_destroy_func: Option<unsafe extern "C" fn(_: *mut c_void)>
) -> *mut GHashTable