Function main

10_smart_pointers/rust/smartpointers.rs:11–32

()

}

fn main() -> Result<()> {
    let a = Box::new(5);
    println!("deref of box {:?} yields {}", a, *a);
    let mut l = List {
        next: None,
        value: 1,
    };
    l.next = Some(Box::new(List {
        next: None,
        value: 2,
    }));
    println!("list value {}", l.value);

    let b = Rc::new(*a);
    let _c = Rc::clone(&b); // increase reference count (cheap)
    println!("{} refcount: {}", &b, Rc::strong_count(&b));
    // if b is not a Rc type this is potentially deep-copying (expensive)
    // avoid this notation when doing refcount clones
    let _d = b.clone();
    println!("{} refcount: {}", &b, Rc::strong_count(&b));
    Ok(())
}