fn main() {
    {
        struct Point<T> {
            x: T,
            y: T,
        }

        impl<T> Point<T> {
            fn x(&self) -> &T {
                &self.x
            }
        }

        // implement a particular concrete type
        impl Point<f32> {
            fn distance_from_origin(&self) -> f32 {
                (self.x.powi(2) + self.y.powi(2)).sqrt()
            }
        }

        let p = Point { x: 5, y: 10 };
        println!("p.x = {}", p.x());

        let p2 = Point { x: 1.0, y: 4.0 };
        println!(
            "distance between p2 and origin: {}",
            p2.distance_from_origin()
        );
    }
    {
        struct Point<T, U> {
            x: T,
            y: U,
        }

        impl<T, U> Point<T, U> {
            fn mixup<V, W>(self, other: Point<V, W>) -> Point<T, W> {
                Point {
                    x: self.x,
                    y: other.y,
                }
            }
        }

        let p1 = Point { x: 5, y: 10.4 };
        let p2 = Point { x: "Hello", y: 'c' };

        let p3 = p1.mixup(p2);

        println!("p3.x = {}, p3.y = {}", p3.x, p3.y);
    }
}