enum2pos

enum2pos is a rust derive macro for enums that generates from_index(usize, Vec<String>) -> Option<Self> and to_index() methods for converting between an variants and their position within the enum declaration (similar to an index).

Usage

Add this to your Cargo.toml:

toml enum2pos = "0.1.0"

Example:

```rust use enum2pos::EnumIndex;

[derive(EnumIndex, PartialEq, Debug)]

enum SampleEnum { Unit, Unnamed(i32, String), }

[test]

fn to_index() { let unit = SampleEnum::Unit; let unnamed = SampleEnum::Unnamed(42, String::from("test"));

assert_eq!(unit.to_index(), 0);
assert_eq!(unnamed.to_index(), 1);

}

[test]

fn fromindexunit() { let index = 0; let args: Vec = vec![]; let expected = Some(SampleEnum::Unit);

assert_eq!(SampleEnum::from_index(index, args), expected);

}

[test]

fn fromindexunnamed() { let index = 1; let args = vec!["42".tostring(), "test".tostring()]; let expected = Some(SampleEnum::Unnamed(42, String::from("test")));

assert_eq!(SampleEnum::from_index(index, args), expected);

}

[test]

fn fromindexinvalid() { let index = 2; let args: Vec = vec![];

assert_eq!(SampleEnum::from_index(index, args), None);

} ```