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Subject[PATCH 5/7] rust: sync: allow type of `self` to be `ArcBorrow<T>`
Date
This allows associated functions whose `self` argument has
`ArcBorrow<T>` as their type. This, in turn, allows callers to use the
dot syntax to make calls.

Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
---
rust/kernel/sync/arc.rs | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
index f68bfc02c81a..84f31c85a513 100644
--- a/rust/kernel/sync/arc.rs
+++ b/rust/kernel/sync/arc.rs
@@ -255,11 +255,34 @@ impl<T: ?Sized> Drop for Arc<T> {
/// // Assert that both `obj` and `cloned` point to the same underlying object.
/// assert!(core::ptr::eq(&*obj, &*cloned));
/// ```
+///
+/// Using `ArcBorrow<T>` as the type of `self`:
+///
+/// ```
+/// use crate::sync::{Arc, ArcBorrow};
+///
+/// struct Example {
+/// a: u32,
+/// b: u32,
+/// }
+///
+/// impl Example {
+/// fn use_reference(self: ArcBorrow<'_, Self>) {
+/// // ...
+/// }
+/// }
+///
+/// let obj = Arc::try_new(Example { a: 10, b: 20 })?;
+/// obj.as_arc_borrow().use_reference();
+/// ```
pub struct ArcBorrow<'a, T: ?Sized + 'a> {
inner: NonNull<ArcInner<T>>,
_p: PhantomData<&'a ()>,
}

+// This is to allow [`ArcBorrow`] (and variants) to be used as the type of `self`.
+impl<T: ?Sized> core::ops::Receiver for ArcBorrow<'_, T> {}
+
impl<T: ?Sized> Clone for ArcBorrow<'_, T> {
fn clone(&self) -> Self {
*self
--
2.34.1
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