assert_eq!(Arc::try_unwrap(x), Ok(5));
}
+#[test]
+fn into_inner() {
+ for _ in 0..100
+ // ^ Increase chances of hitting potential race conditions
+ {
+ let x = Arc::new(3);
+ let y = Arc::clone(&x);
+ let r_thread = std::thread::spawn(|| Arc::into_inner(x));
+ let s_thread = std::thread::spawn(|| Arc::into_inner(y));
+ let r = r_thread.join().expect("r_thread panicked");
+ let s = s_thread.join().expect("s_thread panicked");
+ assert!(
+ matches!((r, s), (None, Some(3)) | (Some(3), None)),
+ "assertion failed: unexpected result `{:?}`\
+ \n expected `(None, Some(3))` or `(Some(3), None)`",
+ (r, s),
+ );
+ }
+
+ let x = Arc::new(3);
+ assert_eq!(Arc::into_inner(x), Some(3));
+
+ let x = Arc::new(4);
+ let y = Arc::clone(&x);
+ assert_eq!(Arc::into_inner(x), None);
+ assert_eq!(Arc::into_inner(y), Some(4));
+
+ let x = Arc::new(5);
+ let _w = Arc::downgrade(&x);
+ assert_eq!(Arc::into_inner(x), Some(5));
+}
+
#[test]
fn into_from_raw() {
let x = Arc::new(Box::new("hello"));