This crates provides create_ordinalized_enum macro to let enums can not only get its variants' ordinal but also be constructed from an ordinal.
create_ordinalized_enum macro can create an enum and implement a ordinal method, as well as from_ordinal and from_ordinal_unsafe associated functions for it.
The new enum also implements Debug, PartialOrd, Ord, PartialEq, Clone, Eq, Hash and Copy traits.
```rust
createordinalizedenum!(MyEnum, Zero, One, Two );
asserteq!(2, MyEnum::Two.ordinal()); asserteq!(Some(MyEnum::One), MyEnum::from_ordinal(1));
createordinalizedenum!(pub MyPublicEnum, A, B, C );
asserteq!(2, MyPublicEnum::C.ordinal()); asserteq!(Some(MyPublicEnum::B), MyPublicEnum::from_ordinal(1));
createordinalizedenum!(MySpecialEnum, Two = 2, Four = 4, Eight = 8 );
asserteq!(2, MySpecialEnum::Two.ordinal()); asserteq!(Some(MySpecialEnum::Four), MySpecialEnum::from_ordinal(4)); ```
An ordinalized enum is always sized isize in order to directly transmute into an isize value, or conversely. There is a variant named __DotNotUse whose ordinal is always the maximum of an isize value for every ordinalized enum.
If you are 100% sure that the isize value can transmute into a variant of your ordinalized enum. You can use the from_ordinal_unsafe associated function and the unsafe keyword to speed up.
```rust
createordinalizedenum!(MyEnum, Zero, One, Two );
asserteq!(MyEnum::One, unsafe{MyEnum::fromordinal_unsafe(1)}); ```
https://crates.io/crates/enum-ordinalize
https://docs.rs/enum-ordinalize