e_num

Serialize enums into numbers.

Warning

This library works with variant fields (e.g. Variant1(u64)) by bitshifting the number representation of the contained value over enough so that the tagging can fit on the right of the number. If you're dealing with very large numbers in the fields or have a ton of variants, data on the left side of the value will likely be lost.

Usage

#[macro_use]
extern crate e_num;

use e_num::ENum;

#[derive(ENum)]
enum A {
  B,
  C(u64),
}

fn main() {
  let b: usize = A::B.to_num();
  println!("b as a number: {:#b}", b);
  let b = A::from_num(b);
  assert!(match b {
    A::B => true,
    _ => false,
  });
  let c = A::C(85).to_num();
  println!("c as a number: {:#b}", c);
  let c = A::from_num(c);
  assert!(match c {
    A::C(inner) => {
      assert_eq!(inner, 85);
      true
    }
    _ => false,
  });
}

License

This project is licensed under the MIT license. See the LICENSE file for more details.