POO in rust

main.rs

use std::any::Any;

trait Animal {
    fn give_my_name(&self) -> String;

    fn eat(&self) {
        println!("miam !!!!");
    }

    fn as_any(&self) -> &dyn Any;
}
// Domain
struct Dog {
}
impl Dog {
    fn bite(&self) {
        println!("ça fait mal !!!!");
    }
}
impl Animal for Dog {
    fn give_my_name(&self) -> String {
        String::from("Chien")
    }

    fn as_any(&self) -> &dyn Any {
        self
    }
}
struct Cat { }
impl Animal for Cat {
    fn give_my_name(&self) -> String {
        String::from("Cat")
    }

    fn as_any(&self) -> &dyn Any {
        self
    }
}

fn main() {
    let dog = Dog { };
    let cat = Cat { };

    /*let mut animals = Vec::new() as Vec<Box<dyn Animal>>;
    animals.push(Box::new(dog));
    animals.push(Box::new(cat));*/

    let mut animals = Vec::new() as Vec<&dyn Animal>;
    animals.push(&dog);
    animals.push(&cat);

    if let Some(chien) = animals.get(0) {
        let dog_2 = chien.as_any().downcast_ref::<Dog>().unwrap();
        dog_2.bite();
    } else {
        panic!("Pourquoi y en a pas");
    }
}