small_iter_fields

This crate adds #[derive(IterFields)] and #[derive(LenFields)].

It works for:

• Enums

Known Limitations

• Enum variants must have no data

Example

use std::collections::HashMap;
use small_iter_fields::{IterFields, LenFields};
 
#[derive(IterFields, LenFields, Hash, PartialEq, Eq)]
enum Stage {
  Start,
  Middle,
  End,
}

let mut map: HashMap<Stage, Vec<i32>> = HashMap::with_capacity(Stage::len());
assert!(map.capacity() >= 3);

for stage in Stage::iter_fields() {
  map.insert(stage, Vec::new());
};
 
assert!(map.contains_key(&Stage::Start));
assert!(map.contains_key(&Stage::Middle));
assert!(map.contains_key(&Stage::End));

License

MIT or Apache-2.0