1 unstable release

Uses old Rust 2015

0.1.0 Nov 24, 2018

#176 in #fields


Used in e_num

MIT license

8KB
220 lines

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.

Dependencies

~2.5MB
~55K SLoC