#[std]

struct Counter {
    let count: num;

    fn new() -> Counter { return 0 as Counter }

    fn increment(self: &Counter) {
        self->count += 1;
    }

    fn decrement(self: &Counter) {
        self->count -= 1;
    }
}

fn inc(c: Counter) {
    // c is a copy, it does not affect the
    // Counter given to the function
    c.increment();
    c.increment();
    c.increment();
    putstr("this should print 3 => "); putnumln(c->count);
}

fn main() {
    let c = Counter::new();
    putstr("this should print 0 => "); putnumln(c->count);
    inc(c);
    putstr("this should print 0 => "); putnumln(c->count);
}