small_iter_fields

此crate添加了 #[derive(IterFields)] 和 #[derive(LenFields)]。

它适用于

• 枚举

已知限制

• 枚举变体必须没有数据

示例

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

let mut vec: Vec<Stage> = Vec::with_capacity(Stage::len());
assert!(vec.capacity() >= 3);

for stage in Stage::iter_fields() {
    vec.push(stage);
};

assert!(vec.contains(&Stage::Start));
assert!(vec.contains(&Stage::Middle));
assert!(vec.contains(&Stage::End));

let map: HashMap<Stage, Vec<i32>> = Stage::to_hashmap(Vec::new());
assert!(map.capacity() >= 3);

assert_eq!(map.get(&Stage::Start), Some(&Vec::new()));

许可证

MIT 或 Apache-2.0

lib.rs:

示例

use std::collections::HashMap;
use small_iter_fields::{IterFields, LenFields};

#[derive(IterFields, LenFields, Hash, PartialEq, Eq)]
enum Stage {
    Start,
    Middle,
    End,
}

let mut vec: Vec<Stage> = Vec::with_capacity(Stage::len());
assert!(vec.capacity() >= 3);

for stage in Stage::iter_fields() {
    vec.push(stage);
};

assert!(vec.contains(&Stage::Start));
assert!(vec.contains(&Stage::Middle));
assert!(vec.contains(&Stage::End));

let map: HashMap<Stage, Vec<i32>> = Stage::to_hashmap(Vec::new());
assert!(map.capacity() >= 3);

assert_eq!(map.get(&Stage::Start), Some(&Vec::new()));

枚举必须没有与之关联的数据

use small_iter_fields::IterFields;

#[derive(IterFields)]
enum DataEnum {
    Data(bool),
}