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authorWedson Almeida Filho <wedsonaf@gmail.com>2022-11-10 17:41:39 +0100
committerMiguel Ojeda <ojeda@kernel.org>2022-12-04 01:59:16 +0100
commitba20915bae49024dab6ee582abdd4cd8944a3e55 (patch)
tree58941383549263a3d2e39312d5c339a16a4296c4 /rust/kernel
parentrust: build_assert: add `build_{error,assert}!` macros (diff)
downloadlinux-ba20915bae49024dab6ee582abdd4cd8944a3e55.tar.xz
linux-ba20915bae49024dab6ee582abdd4cd8944a3e55.zip
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>
Diffstat (limited to 'rust/kernel')
-rw-r--r--rust/kernel/lib.rs1
-rw-r--r--rust/kernel/types.rs12
2 files changed, 13 insertions, 0 deletions
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index a3abc110ff97..53040fa9e897 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -31,6 +31,7 @@ mod static_assert;
#[doc(hidden)]
pub mod std_vendor;
pub mod str;
+pub mod types;
#[doc(hidden)]
pub use bindings;
diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
new file mode 100644
index 000000000000..3b0c44769708
--- /dev/null
+++ b/rust/kernel/types.rs
@@ -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),
+}