How can I create an is_prime function that is generic over various integer types?

Question

I just took the dive into Rust and want to make some basic math functions that are generic. I have the following is_prime function:

fn is_prime(         


        

Answer 1

To add to Chris Morgan's answer, you can use num::NumCast::from to cast to a generic number type where using Zero and One would be inappropriate. In your case:

use num::{Num, NumCast};

fn is_prime(n: N) -> bool {
    let _0: N = NumCast::from(0usize).unwrap();
    let _1: N = NumCast::from(1usize).unwrap();
    let _2: N = NumCast::from(2usize).unwrap();
    let _3: N = NumCast::from(3usize).unwrap();
    let _4: N = NumCast::from(4usize).unwrap();
    let _5: N = NumCast::from(5usize).unwrap();
    let _6: N = NumCast::from(6usize).unwrap();