use std;

type vec2 = {x: float, y: float};
type vec3 = {x: float, y: float, z: float};

iface vector_math<T> {
	fn length() -> float;
	fn normalize() -> T;
}

impl vec3_math of vector_math<vec3> for vec3 {
	fn length() -> float {
		ret float::sqrt(self.x*self.x + self.y*self.y + self.z*self.z);
	}
	fn normalize() -> vec3 {
		let l = 1. / self.length();
		ret {x: self.x*l, y: self.y*l, z: self.z*l};
	}
}

fn length<T, I: vector_math<T> >(a: I) -> float { a.length() }
fn normalize<T, I: vector_math<T> >(a: I) -> T { a.normalize() }

fn main() {
	let v = length({x: 10., y: 10., z: 5.});
}