Function quat::len

pub fn len<T>(v: &[T; 4]) -> T where
    T: Real,
    &'a T: Mul<&'b T>,
    <&'a T as Mul<&'b T>>::Output == T, 

Example

assert_eq!(vec4::len::<f32>(&vec4::new_one()), 4_f32.sqrt());