a-rubyist-rusting-part-4-3.rs

pub struct TwoNumbers {
    first: i32,
    second: i32,
}

impl TwoNumbers {
    fn plus_one_to_each(self) -> TwoNumbers {
        let mut tn = self;
        tn.first += 1;
        tn.second += 1;
        tn
    }
}

#[no_mangle]
pub extern fn add_one_to_vals(numbers: TwoNumbers) -> TwoNumbers {
   numbers.plus_one_to_each()
}