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no-std erased-discriminant

Type-erased version of core::mem::Discriminant<T>

1 stable release

1.0.0 Oct 27, 2024

#58 in No standard library

Download history 42/week @ 2024-10-21 94/week @ 2024-10-28 9/week @ 2024-11-04 1/week @ 2024-11-18

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MIT/Apache

10KB
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Type-erased Discriminant

github crates.io docs.rs build status

This crate provides a Discriminant type that behaves like core::mem::Discriminant<T> but without the generic type parameter T. With this, we can build collections such as HashSet that contain discriminants from a mixture of different enum types.

use erased_discriminant::Discriminant;
use std::collections::HashSet;

enum Enum {
    A(i32),
    B,
}

enum DifferentEnum {
    A,
}

let mut set = HashSet::new();
set.insert(Discriminant::of(&Enum::A(99)));
set.insert(Discriminant::of(&Enum::B));
set.insert(Discriminant::of(&DifferentEnum::A));
assert_eq!(set.len(), 3);

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Dependencies

~13KB