linux-kernel - Re: [PATCH v2 27/28] rust: types: add `Either` type

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Date:   Fri, 2 Dec 2022 15:41:59 -0800
From:   Josh Triplett <josh@...htriplett.org>
To:     ojeda@...nel.org
Cc:     Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Wei Liu <wei.liu@...nel.org>
Subject: Re: [PATCH v2 27/28] rust: types: add `Either` type

On Fri, Dec 02, 2022 at 05:14:58PM +0100, ojeda@...nel.org wrote:
> From: Wedson Almeida Filho <wedsonaf@...il.com>
> 
> Introduce the new `types` module of the `kernel` crate with
> `Either` as its first type.
> 
> `Either<L, R>` is a sum type that always holds either a value
> of type `L` (`Left` variant) or `R` (`Right` variant).
> 
> For instance:
> 
>     struct Executor {
>         queue: Either<BoxedQueue, &'static Queue>,
>     }

This specific example seems like it would be better served by the
existing `Cow` type.