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| author | Jonathan Turner <jonathandturner@users.noreply.github.com> | 2016-08-22 15:34:22 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2016-08-22 15:34:22 -0700 |
| commit | 375695c956a32f4056a9622697f3f421fb3b55e0 (patch) | |
| tree | b358b9adc87c98e8cbbc9ffa12d563bbc05aa8d9 | |
| parent | b560f5a7bc66d813138d4a4272318809709c9b8f (diff) | |
| parent | 5310d1110dd245ff4e12cd7b483bec53640bf58b (diff) | |
| download | rust-375695c956a32f4056a9622697f3f421fb3b55e0.tar.gz rust-375695c956a32f4056a9622697f3f421fb3b55e0.zip | |
Rollup merge of #35881 - matthew-piziak:rc-would-unwrap-example, r=GuillaumeGomez
add example for `Rc::would_unwrap` Part of #29372 r? @steveklabnik
| -rw-r--r-- | src/liballoc/rc.rs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs index 2beb652aa01..3a158240c3a 100644 --- a/src/liballoc/rc.rs +++ b/src/liballoc/rc.rs @@ -263,6 +263,23 @@ impl<T> Rc<T> { } /// Checks if `Rc::try_unwrap` would return `Ok`. + /// + /// # Examples + /// + /// ``` + /// #![feature(rc_would_unwrap)] + /// + /// use std::rc::Rc; + /// + /// let x = Rc::new(3); + /// assert!(Rc::would_unwrap(&x)); + /// assert_eq!(Rc::try_unwrap(x), Ok(3)); + /// + /// let x = Rc::new(4); + /// let _y = x.clone(); + /// assert!(!Rc::would_unwrap(&x)); + /// assert_eq!(Rc::try_unwrap(x), Err(Rc::new(4))); + /// ``` #[unstable(feature = "rc_would_unwrap", reason = "just added for niche usecase", issue = "28356")] |