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rust: sync: implement AsRef<T> for Arc<T>

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This trait lets you use `Arc<T>` in code that is generic over smart
pointer types.

The `AsRef` trait should be implemented on all smart pointers. The
standard library also implements it on the ordinary `Arc`.

Co-developed-by: Wedson Almeida Filho <walmeida@microsoft.com>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Link: https://lore.kernel.org/r/20230517200814.3157916-2-aliceryhl@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Alice Ryhl 2023-05-17 20:08:14 +00:00 committed by Miguel Ojeda
parent bd780aea67
commit 47329ba14b
1 changed files with 6 additions and 0 deletions
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6
rust/kernel/sync/arc.rs
View file

@ -264,6 +264,12 @@ fn deref(&self) -> &Self::Target {
}
}
impl<T: ?Sized> AsRef<T> for Arc<T> {
fn as_ref(&self) -> &T {
self.deref()
}
}
impl<T: ?Sized> Clone for Arc<T> {
fn clone(&self) -> Self {
// INVARIANT: C `refcount_inc` saturates the refcount, so it cannot overflow to zero.