nalgebra/examples/scalar_genericity.rs

extern crate alga;
extern crate nalgebra as na;

use alga::general::{RingCommutative, Real};
use na::{Vector3, Scalar};

fn print_vector<N: Scalar>(m: &Vector3<N>) {
  println!("{:?}", m)
}

fn print_squared_norm<N: Scalar + RingCommutative>(v: &Vector3<N>) {
  // NOTE: alternatively, nalgebra already defines `v.squared_norm()`.
  let sqnorm = v.dot(v);

  println!("{:?}", sqnorm);
}

fn print_norm<N: Real>(v: &Vector3<N>) {
  // NOTE: alternatively, nalgebra already defines `v.norm()`.
  let norm = v.dot(v).sqrt();

  // The Real bound implies that N is Display so we can
  // use "{}" instead of "{:?}" for the format string.
  println!("{}", norm)
}

fn main() {
  let v1 = Vector3::new(1, 2, 3);
  let v2 = Vector3::new(1.0, 2.0, 3.0);

  print_vector(&v1);
  print_squared_norm(&v1);
  print_norm(&v2);
}