use std::ops::Deref;


#[derive(Default)]
struct Child {
    a: f32,
    b: f32,
}

#[derive(Default)]
struct Example2 {
    ch: Child,
    c: f32,
    d: f32,
}

impl Deref for Example2 {
    type Target = Child;
    fn deref(&self) -> &Child {
        &self.ch
    }
}

fn main() {
    let e = Example2{
        ch: Child {
            a: 1.0,
            b: 2.0,
        },
        c: 3.0,
        d: 4.0,
    };
    println!("{}", e.a);
    println!("{}", e.b);
    println!("{}", e.c);
    println!("{}", e.d);
}