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SubjectRe: [PATCH 5/7] rust: sync: allow type of `self` to be `ArcBorrow<T>`
On Wed, 28 Dec 2022 06:03:44 +0000
Wedson Almeida Filho <wedsonaf@gmail.com> wrote:

> 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>

Reviewed-by: Gary Guo <gary@garyguo.net>

> ---
> 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

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