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This post is auto-generated from RSS feed The Rust Programming Language Forum - Latest topics. Source: [crate announcement] nodyn: A Macro for Wrapper Enums with Trait and Method Delegation

Hello Rustaceans,

I’m thrilled to announce nodyn, a new crate that makes it easy to create wrapper enums for a fixed set of types with automatic From, TryFrom, and delegated methods or traits. The nodyn::nodyn! macro is designed for type-safe, zero-cost polymorphism using enums without the boilerplate.

Features

• Delegates methods and traits to wrapped types.
• Generates enums with variants for specified types (paths, references, arrays, slices, tuples).
• Implements From<T> for each variant type and TryFrom<Enum> for T for non-reference types.
• Provides introspection methods: count(), types(), and type_name().

Example

nodyn::nodyn! {
    #[derive(Debug)]
    pub enum Article {
        NewsArticle,
        SocialPost,
    }

    impl Summary {
        fn summarize(&self) -> String;
    }
}

pub trait Summary {
    fn summarize(&self) -> String;
}

pub struct NewsArticle { /* fields */ }
impl Summary for NewsArticle {
    fn summarize(&self) -> String { "News summary".to_string() }
}

pub struct SocialPost { /* fields */ }
impl Summary for SocialPost {
    fn summarize(&self) -> String { "Post summary".to_string() }
}

fn main() {
    let article = Article::NewsArticle(NewsArticle {});
    assert_eq!(article.summarize(), "News summary");
}

Links

• Crates.io
• Docs.rs

I’d appreciate feedback, use cases, or suggestions for nodyn.

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