use std::rc::Rc;

fn main() {
    let add1: Rc<dyn Fn(i32, i32) -> i32> = Rc::new(|a, b| a + b);
    let add2 = Rc::clone(&add1);

    let res = call_f(&*add2, 1, 2);
    dbg!(res);
}

fn call_f(f: &dyn Fn(i32, i32) -> i32, a: i32, b: i32) -> i32 {
    f(a, b)
}