Generate Rust enum kind types without boilerplate.
```rs use kinded::Kinded;
enum Drink { Mate, Coffee(String), Tea { variety: String, caffeine: bool } }
let drink = Drink::Coffee("Espresso".toowned()); asserteq!(drink.kind(), DrinkKind::Coffee); ```
Note, the definition of DrinkKind enum was generated automatically as well as Drink::kind() method.
The library provides Kinded trait:
```rs pub trait Kinded { type Kind: PartialEq + Eq + Debug + Clone + Copy;
fn kind(&self) -> Self::Kind;
} ```
From the example above, the derived implementation of Kinded for Drink resembles the following:
```rs impl Kinded for Drink { type Kind = DrinkKind;
fn kind(&self) -> DrinkKind {
match self {
Drink::Mate => DrinkKind::Mate,
Drink::Coffee(..) => DrinkKind::Coffee,
Drink::Tea { .. } => DrinkKind::Tea,
}
}
} ```
The Kinded trait allows to build abstract functions that can be used with different enum types.
By default the kind type name is generated by adding postfix Kind to the original enum name.
This can be customized with kind = attribute:
```rs use kinded::Kinded;
enum Drink { Mate, Coffee(String), Tea { variety: String, caffeine: bool } } ```
By default the kind type implements the following traits: Debug, Clone, Copy, PartialEq, Eq, From<T>, From<&T>.
Extra traits can be derived with derive(..) attribute:
```rs use kinded::Kinded; use std::collections::HashSet;
enum Drink { Mate, Coffee(String), Tea { variety: String, caffeine: bool } }
let mut drinkkinds = HashSet::new(); drinkkinds.insert(DrinkKind::Mate); ```
There is a very similar crate enum-kinds that does almost the same job.
The main difference between kinded and enum-kinds crate is that kinded provides the Kinded trait, on top of which
users can implement abstract functions and use them with different enum types.
Another minor difference is that apart from From<T> and From<&T> conversions, kidned also implements kind() function on the enum type.
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