diff options
Diffstat (limited to 'library/alloc/src/sync.rs')
| -rw-r--r-- | library/alloc/src/sync.rs | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/library/alloc/src/sync.rs b/library/alloc/src/sync.rs index 6432bdfbbed..5927d036469 100644 --- a/library/alloc/src/sync.rs +++ b/library/alloc/src/sync.rs @@ -9,6 +9,7 @@ //! `#[cfg(target_has_atomic = "ptr")]`. use core::any::Any; +use core::cell::CloneFromCell; #[cfg(not(no_global_oom_handling))] use core::clone::CloneToUninit; use core::clone::UseCloned; @@ -281,6 +282,10 @@ impl<T: ?Sized + Unsize<U>, U: ?Sized, A: Allocator> CoerceUnsized<Arc<U, A>> fo #[unstable(feature = "dispatch_from_dyn", issue = "none")] impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Arc<U>> for Arc<T> {} +// SAFETY: `Arc::clone` doesn't access any `Cell`s which could contain the `Arc` being cloned. +#[unstable(feature = "cell_get_cloned", issue = "145329")] +unsafe impl<T: ?Sized> CloneFromCell for Arc<T> {} + impl<T: ?Sized> Arc<T> { unsafe fn from_inner(ptr: NonNull<ArcInner<T>>) -> Self { unsafe { Self::from_inner_in(ptr, Global) } @@ -356,6 +361,10 @@ impl<T: ?Sized + Unsize<U>, U: ?Sized, A: Allocator> CoerceUnsized<Weak<U, A>> f #[unstable(feature = "dispatch_from_dyn", issue = "none")] impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Weak<U>> for Weak<T> {} +// SAFETY: `Weak::clone` doesn't access any `Cell`s which could contain the `Weak` being cloned. +#[unstable(feature = "cell_get_cloned", issue = "145329")] +unsafe impl<T: ?Sized> CloneFromCell for Weak<T> {} + #[stable(feature = "arc_weak", since = "1.4.0")] impl<T: ?Sized, A: Allocator> fmt::Debug for Weak<T, A> { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |