bjoernager/rust
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Add CoerceSized impls throughout libstd

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This will make receiver types like `Rc<Self>` and `Pin<&mut Self>`
object-safe.
This commit is contained in:
Michael Hewson 2018-09-20 03:18:00 -04:00
parent 9f59da2864
commit 192900e7c2
7 changed files with 36 additions and 6 deletions
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7
src/liballoc/sync.rs
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@ -25,7 +25,7 @@ use core::cmp::Ordering;
use core::intrinsics::abort;
use core::mem::{self, align_of_val, size_of_val};
use core::ops::Deref;
use core::ops::CoerceUnsized;
use core::ops::{CoerceUnsized, CoerceSized};
use core::pin::Pin;
use core::ptr::{self, NonNull};
use core::marker::{Unpin, Unsize, PhantomData};
@ -214,6 +214,9 @@ unsafe impl<T: ?Sized + Sync + Send> Sync for Arc<T> {}
#[unstable(feature = "coerce_unsized", issue = "27732")]
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Arc<U>> for Arc<T> {}
#[unstable(feature = "coerce_sized", issue = "0")]
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceSized<Arc<T>> for Arc<U> {}
/// `Weak` is a version of [`Arc`] that holds a non-owning reference to the
/// managed value. The value is accessed by calling [`upgrade`] on the `Weak`
/// pointer, which returns an [`Option`]`<`[`Arc`]`<T>>`.
@ -254,6 +257,8 @@ unsafe impl<T: ?Sized + Sync + Send> Sync for Weak<T> {}
#[unstable(feature = "coerce_unsized", issue = "27732")]
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Weak<U>> for Weak<T> {}
#[unstable(feature = "coerce_sized", issue = "0")]
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceSized<Weak<T>> for Weak<U> {}
#[stable(feature = "arc_weak", since = "1.4.0")]
impl<T: ?Sized + fmt::Debug> fmt::Debug for Weak<T> {