struct_params.ko

module struct_params {
    meta {
        purpose: "Demonstrate structs as function parameters and return values",
        version: "0.1.0"
    }

    struct Point {
        x: Int,
        y: Int
    }

    fn get_x(ref p: Point) -> Int {
        return p.x
    }

    fn get_y(ref p: Point) -> Int {
        return p.y
    }

    fn make_point(x: Int, y: Int) -> Point {
        return Point { x: x, y: y }
    }

    fn add_points(ref a: Point, ref b: Point) -> Point {
        return Point { x: a.x + b.x, y: a.y + b.y }
    }

    fn main() {
        let p: Point = Point { x: 10, y: 20 }
        print_int(get_x(p))
        print_int(get_y(p))

        let q: Point = make_point(30, 40)
        print_int(q.x)
        print_int(q.y)

        let r: Point = add_points(p, q)
        print_int(r.x)
        print_int(r.y)
    }
}