Commit ba20915b authored Nov 10, 2022 by Wedson Almeida Filho Committed by Miguel Ojeda Dec 04, 2022

rust: types: add `Either` type



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>

parent 0f595bab

rust/kernel/lib.rs

+1 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,7 @@ mod static_assert;
		#[doc(hidden)]
		pub mod std_vendor;
		pub mod str;
		pub mod types;

		#[doc(hidden)]
		pub use bindings;

rust/kernel/types.rs

0 → 100644

+12 −0

Original line number	Diff line number	Diff line
		// 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),
		}