use std::{rc::Rc, cell::RefCell};

#[derive(Debug)]
struct CoolThing {
    a: i32,
    b: String,
    c: f32,
}

trait CoolThingTrait {
    fn foo(self: Rc<Self>);
    fn bar(self: Rc<Self>);
}

impl CoolThingTrait for RefCell<CoolThing> {
    fn foo(self: Rc<Self>) {
        let mut ct = self.borrow_mut();
        ct.a += 8;
        ct.b = "asdf".to_string();
        ct.c = 4321.0;
    }

    fn bar(self: Rc<Self>) {
        let ct = self.borrow();
        println!("{:?}", *ct);
    }
}

fn main() {
    let ct = Rc::new(RefCell::new(CoolThing {
        a: 42,
        b: "hello world".to_string(),
        c: 1234.0,
    }));

    let ct_a = Rc::clone(&ct);
    let ct_b = Rc::clone(&ct);

    ct_a.foo();
    ct_b.bar();
}