pub unsafe extern "C" fn g_tree_new_full(
key_compare_func: Option<unsafe extern "C" fn(_: *const c_void, _: *const c_void, _: *mut c_void) -> i32>,
key_compare_data: *mut c_void,
key_destroy_func: Option<unsafe extern "C" fn(_: *mut c_void)>,
value_destroy_func: Option<unsafe extern "C" fn(_: *mut c_void)>
) -> *mut GTree