https://github.com/andrewbaxter/samevariant

Derive an enum of same-variant pairs
https://github.com/andrewbaxter/samevariant

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Derive an enum of same-variant pairs

• Host: GitHub
• URL: https://github.com/andrewbaxter/samevariant
• Owner: andrewbaxter
• License: isc
• Created: 2023-01-14T13:17:18.000Z (almost 2 years ago)
• Default Branch: master
• Last Pushed: 2024-07-21T19:08:23.000Z (4 months ago)
• Last Synced: 2024-10-28T22:31:10.679Z (19 days ago)
• Language: Rust
• Size: 4.88 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: license.txt

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README

        
Derives an enum of same-variant pairs of another enum.

# Installation

```sh

cargo add samevariant

```

# Use

Define an enum and use this derive macro:

```

#[samevariant(pub ABCSameVariant)]

pub enum ABC {

    A,

    B,

    C(i32),

}

```

It generates a new enum that looks like:

```

enum ABCSameVariant<'l> {

    Nonmatching(&'l ABC, &'l ABC),

    A,

    B,

    C(&'l i32, &'l i32),

}

impl ABCSameVariant {

    fn pairs<'l>(a: &'l ABC, b: &'l ABC) -> ABCSameVariant<'l> {

        ...

    }

}

```

If the base enum has a variant `Nonmatching` it will be prefixed by the original enum name (like `ABCNonmatching`).

Only simple and tuple variants are supported, struct-like variants will result in an error.