this post was submitted on 02 Jul 2021
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Rust Programming

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Here is a simplified example of my problem:

struct User;
struct Community;

enum Actor {
    User(User),
    Community(Community),
}

trait Name {
    fn name() -> &'static str;
}

impl Name for User {
    fn name() -> &'static str { "/u/nutomic" }
}

impl Name for Community {
    fn name() -> &'static str { "/c/rust " }
}

fn main() {
    let actor = Actor::Community(Community);
    println!("{}", actor.name());
}

Playground link

As you may have noticed, this doesnt compile. The only solution I can think of is with a match. I want to avoid that because I have an enum with 30+ variants, and a trait with multiple methods. So that would be a huge match statement in each method, when the compiler should know that the enum variants all have the same trait.

So, do you know any way to make this work without match?

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[โ€“] [email protected] 2 points 3 years ago (1 children)

I dont care what the public type is, so that sounds perfect. But its not clear to me from the documentation how that attribute works. Do you happen to know an example?

[โ€“] [email protected] 2 points 3 years ago* (last edited 3 years ago)