Function rc::get_mut

pub fn get_mut<T>(rc: &mut Rc<T>) -> Option<&mut T>

Returns a mutable reference to the contained value if the Rc<T> is unique.

Returns None if the Rc<T> is not unique.

Examples

use rc::{self, Rc};

let mut x = Rc::new(3);
*rc::get_mut(&mut x).unwrap() = 4;
assert_eq!(*x, 4);

let _y = x.clone();
assert!(rc::get_mut(&mut x).is_none());