use std::time::Instant;

const SCALE: usize = 100;

fn main() {
    let mut boxes: Vec<Box<Foo>> = Vec::with_capacity(SCALE);
    for _ in 0..SCALE {
        boxes.push(Box::new(Bar));
    }
    let mut bars: Vec<Bar> = Vec::with_capacity(SCALE);
    for _ in 0..SCALE {
        bars.push(Bar);
    }
    let start = Instant::now();
    for i in 0..SCALE {
        assert_eq!(boxes[i].foo(), 4)
    }
    let time = start.elapsed();
    println!("Box time: {:?}", time);
    let start = Instant::now();
    for i in 0..SCALE {
        assert_eq!(bars[i].foo(), 4)
    }
    let time = start.elapsed();
    println!("No box time: {:?}", time);
}

trait Foo {
    fn foo(&self) -> i32 {
        2 + 2
    }
}

struct Bar;

impl Foo for Bar {}