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Allow Arc::from_raw to be used with a pointer from Arc::as_ptr #106185

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Allow Arc::from_raw to be used with a pointer from Arc::as_ptr #106185

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11 changes: 6 additions & 5 deletions library/alloc/src/sync.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -886,11 +886,11 @@ impl<T: ?Sized> Arc<T> {
/// Constructs an `Arc<T>` from a raw pointer.
///
/// The raw pointer must have been previously returned by a call to
/// [`Arc<U>::into_raw`][into_raw] where `U` must have the same size and
/// alignment as `T`. This is trivially true if `U` is `T`.
/// Note that if `U` is not `T` but has the same size and alignment, this is
/// basically like transmuting references of different types. See
/// [`mem::transmute`][transmute] for more information on what
/// [`Arc<U>::into_raw`][into_raw] or [`Arc::<U>::as_ptr`][as_ptr] where `U`
/// must have the same size and alignment as `T`. This is trivially true
/// if `U` is `T`. Note that if `U` is not `T` but has the same size and
/// alignment, this is basically like transmuting references of different
/// types. See [`mem::transmute`][transmute] for more information on what
/// restrictions apply in this case.
///
/// The user of `from_raw` has to make sure a specific value of `T` is only
Expand All @@ -900,6 +900,7 @@ impl<T: ?Sized> Arc<T> {
/// even if the returned `Arc<T>` is never accessed.
///
/// [into_raw]: Arc::into_raw
/// [as_ptr]: Arc::as_ptr
/// [transmute]: core::mem::transmute
///
/// # Examples
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