Function rc::try_unwrap

pub fn try_unwrap<T>(rc: Rc<T>) -> Result<T, Rc<T>>

Unwraps the contained value if the Rc<T> is unique.

If the Rc<T> is not unique, an Err is returned with the same Rc<T>.

Examples

use rc::{self, Rc};

let x = Rc::new(3);
assert_eq!(rc::try_unwrap(x), Ok(3));

let x = Rc::new(4);
let _y = x.clone();
assert_eq!(rc::try_unwrap(x), Err(Rc::new(4)));