trpl-zh-cn/listings/ch15-smart-pointers/listing-15-12/src/main.rs

use std::ops::Deref;

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

    fn deref(&self) -> &T {
        &self.0
    }
}

struct MyBox<T>(T);

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

fn hello(name: &str) {
    println!("Hello, {name}!");
}

// ANCHOR: here
fn main() {
    let m = MyBox::new(String::from("Rust"));
    hello(&m);
}
// ANCHOR_END: here