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Marcello 2021-11-21 19:14:10 +01:00
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@ -1181,6 +1181,11 @@ Just like the compile-time borrowing rules, `RefCell<T>` allows to have many imm
A common way to use `RefCell<T>` is in combination with `Rc<T>`. `Rc<T>` allows to have multiple owners of some data, but it only gives immutable access to that data.
By having a `Rc<T>` that holds a `RefCell<T>`, its' possible to get a value that can have multiple owners and that can mutate.
The standard library has other types that provide interior mutability:
- `Cell<T>` which is similar except that instead of giving references to the inner value, the value is copied in and out of the `Cell<T>`.
- `Mutex<T>` which offers interior mutability that's safe to use across threads;
### Reference Cycles Can Leak Memory
Rust's memory safety guarantees make it difficult, but not impossible, to accidentally create memory that is never cleaned up (known as a memory leak).