use std::ops::Deref;

struct MyBox<T>(T);

impl<T> MyBox<T> {
    fn new(x: T) -> Self {
        Self(x)
    }
}

impl<T> Deref for MyBox<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

fn main() {
    let n = MyBox::new(40);
    let sum = *n + 2;
    dbg!(&sum);
}