diff options
Diffstat (limited to 'library/alloc/src/rc.rs')
| -rw-r--r-- | library/alloc/src/rc.rs | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/library/alloc/src/rc.rs b/library/alloc/src/rc.rs index 023238a00db..2b62b92d438 100644 --- a/library/alloc/src/rc.rs +++ b/library/alloc/src/rc.rs @@ -242,7 +242,7 @@ #![stable(feature = "rust1", since = "1.0.0")] use core::any::Any; -use core::cell::Cell; +use core::cell::{Cell, CloneFromCell}; #[cfg(not(no_global_oom_handling))] use core::clone::CloneToUninit; use core::clone::UseCloned; @@ -340,6 +340,10 @@ impl<T: ?Sized + Unsize<U>, U: ?Sized, A: Allocator> CoerceUnsized<Rc<U, A>> for #[unstable(feature = "dispatch_from_dyn", issue = "none")] impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Rc<U>> for Rc<T> {} +// SAFETY: `Rc::clone` doesn't access any `Cell`s which could contain the `Rc` being cloned. +#[unstable(feature = "cell_get_cloned", issue = "145329")] +unsafe impl<T: ?Sized> CloneFromCell for Rc<T> {} + impl<T: ?Sized> Rc<T> { #[inline] unsafe fn from_inner(ptr: NonNull<RcInner<T>>) -> Self { @@ -3013,6 +3017,10 @@ 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> {} + impl<T> Weak<T> { /// Constructs a new `Weak<T>`, without allocating any memory. /// Calling [`upgrade`] on the return value always gives [`None`]. |