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rust: types: add Either type

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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>,
    }

Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Wedson Almeida Filho 2022-11-10 17:41:39 +01:00 committed by Miguel Ojeda
parent 0f595bab9d
commit ba20915bae
2 changed files with 13 additions and 0 deletions
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1
rust/kernel/lib.rs
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@ -31,6 +31,7 @@ mod static_assert;
#[doc(hidden)]
pub mod std_vendor;
pub mod str;
pub mod types;
#[doc(hidden)]
pub use bindings;

12
rust/kernel/types.rs Normal file
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@ -0,0 +1,12 @@
// SPDX-License-Identifier: GPL-2.0
//! Kernel types.
/// A sum type that always holds either a value of type `L` or `R`.
pub enum Either<L, R> {
/// Constructs an instance of [`Either`] containing a value of type `L`.
Left(L),
/// Constructs an instance of [`Either`] containing a value of type `R`.
Right(R),
}