multi.rs

trait Next<S> {
    fn next(&mut self) -> S;
}

#[derive(Debug)]
struct Multi {
    s: &'static str,
    n: u8,
    x: f32,
}

impl Next<&'static str> for Multi {
    fn next(&mut self) -> &'static str {
        self.s
    }
}

impl Next<u8> for Multi {
    fn next(&mut self) -> u8 {
        self.n
    }
}

impl Next<f32> for Multi {
    fn next(&mut self) -> f32 {
        self.x
    }
}

fn main() {
    let mut multi = Multi { s: "Hello, World!", n: 42, x: 0.3 };
    println!("{:?}", multi);
    let n: u8 = multi.next();
    println!("{:?}", n);
}