Commit 92a655ae authored by Wedson Almeida Filho's avatar Wedson Almeida Filho Committed by Miguel Ojeda
Browse files

rust: sync: allow type of `self` to be `ArcBorrow<T>` 



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: default avatarWedson Almeida Filho <wedsonaf@gmail.com>
Reviewed-by: default avatarAlice Ryhl <aliceryhl@google.com>
Reviewed-by: default avatarGary Guo <gary@garyguo.net>
Reviewed-by: default avatarVincenzo Palazzo <vincenzopalazzodev@gmail.com>
Acked-by: default avatarBoqun Feng <boqun.feng@gmail.com>
Signed-off-by: default avatarMiguel Ojeda <ojeda@kernel.org>
parent 17f67160

rust/kernel/sync/arc.rs

+23 −0
Original line number Diff line number Diff line
@@ -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