use std::ops::*;

pub trait Num:
    Copy
    + Sized
    + Mul<Output=Self>
    + Add<Output=Self>
    + Into<f64>
{
}

impl <T: Copy
    + Sized
    + Mul<Output=Self>
    + Add<Output=Self>
    + Into<f64>> Num for T {}

struct Vec3<S> {
    x: S,
    y: S,
    z: S,
}

impl <S: Num> Vec3<S> {
    fn new(x: S, y: S, z: S) -> Vec3<S> {
        Vec3{
            x,
            y,
            z
        }
    }

    fn len(&self) -> f64 {
        ((self.x * self.x + self.y * self.y + self.z * self.z).into()).sqrt()
    }
}

fn main() {
    let test = Vec3::new(1.0, 1.0, 2.0);
    // println!("{}", test.len())
}