How to clone an Option<Rc<_>> in Rust?

Question

Say I have an Option of Rc:

let x = Some(Rc::new(3));

If I need to make a clone, I can do:

let y = Some(Rc::clone(&x.unwrap()));

But it seems there's also a short cut:

let y = x.clone();

Are there any difference between these options? Or they are internally doing the same thing?

Answer 1

There's a generic implementation

impl<T: Clone> Clone for Option<T> {
    #[inline]
    fn clone(&self) -> Self {
        match self {
            Some(x) => Some(x.clone()),
            None => None,
        }
    }
    // ...
}

So if x is Option<Rc<T>>, x.clone() will simply defer to the Clone implementation on Rc<T>.