Noções Básicas de Ponteiros Inteligentes

fn main() {
    let b = Box::new(42);
    println!("{}", *b);
}

use std::rc::Rc;
let a = Rc::new(String::from("compartilhado"));
let b = Rc::clone(&a);

use std::sync::Arc;
let a = Arc::new(vec![1, 2]);

use std::cell::RefCell;
let c = RefCell::new(0);
*c.borrow_mut() += 1;

use std::borrow::Cow;
let s: Cow<str> = Cow::Borrowed("hello");

use std::rc::{Rc, RefCell};
let v = Rc::new(RefCell::new(vec![1]));
v.borrow_mut().push(2);

use std::rc::{Rc, Weak};
// upgrade() retorna Option<Rc<T>>

use std::ops::Deref;
struct MyBox<T>(T);
impl<T> Deref for MyBox<T> {
    type Target = T;
    fn deref(&self) -> &T { &self.0 }
}