Confuse by Rc doc

[luyang177]

Rc Officail doc say:
The type Rc provides shared ownership of a value of type T, allocated in the heap.

If I have a struct 'Person', when I write

Rc<Person>

the Person is always allocate in the heap automatically via Rc::new()?
But what is different to the

Rc<Box<Person>>

[steveklabnik]

@luyang177

the Person is always allocate in the heap automatically via Rc::new()?

Yup!

@luyang177

But what is different to the

Rc<Box<Person>>

That would allocate a pointer on the heap, and that pointer would point to a Person elsewhere on the heap.

[luyang177]

And Refcell::new is always allocate in the heap?

[wdv4758h]

@luyang177

And Refcell::new is always allocate in the heap?

No

[vitalyd]

Choosing your Guarantees covers the costs of these.