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armanriazi•rust•type•wrapper•vs•clone

If implementing Clone would be prohibitively expensive, Rc<T> can be a handy alternative. This allows two places to “share” ownership.
We could have called a.clone() rather than Rc::clone(&a), but Rust’s convention is to use Rc::clone in this case. The implementation of Rc::clone doesn’t make a deep copy of all the data like most types’ implementations of clone do.
The call to Rc::clone only increments the reference count,
which doesn’t take much time. Deep copies of data can take a lot of time.
By using Rc::clone for reference counting, we can visually distinguish between the deep-copy kinds of clones and the kinds of clones that increase the reference count

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