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armanriazi•rust•smartpointer•box•vs•rc•vs•refcell

ArmanRiazi answered on March 24, 2022 Popularity 1/10 Helpfulness 1/10

answer armanriazi•rust•smartpointer•box•vs•rc•vs•refcell

armanriazi•rust•smartpointer•box•vs•rc•vs•refcell

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//This post is related to inter mutability pattern
Here is a recap of the reasons to choose Box<T>, Rc<T>, or RefCell<T>:
Rc<T> enables multiple owners of the same data; Box<T> and RefCell<T> have single owners.
Box<T> allows immutable or mutable borrows checked at compile time; Rc<T> allows only immutable borrows checked at compile time; RefCell<T> allows immutable or mutable borrows checked at runtime.
Because RefCell<T> allows mutable borrows checked at runtime, you can mutate the value inside the RefCell<T> even when the RefCell<T> is immutable.
RefCell<T> lets us have many immutable borrows or one mutable borrow at any point in time.
Mutating the value inside an immutable value is the interior mutability pattern.
{
Similar to Rc<T>, RefCell<T> is only for use in single-threaded scenarios 
}
{
The standard library has other types that provide interior mutability,
 such as 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>.
 There’s also Mutex<T>, which offers interior mutability that’s safe to use across threads
}
{
 neither Cell<T> nor RefCell<T> are thread safe (they do not implement Sync)
}

Popularity 1/10 Helpfulness 1/10 Language rust

Source: github.com

Tags: rust

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Contributed on Mar 24 2022

ArmanRiazi

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armanriazi•rust•smartpointer•box•vs•rc•vs•refcell

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