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Const Deref #88887

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Sep 17, 2021
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Merged

Const Deref #88887

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Const Deref
@fee1-dead
fee1-dead committed Sep 15, 2021

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commit 349ac4f6c8839c89a39d1dd9fac1fbe9a30f2626
6 changes: 5 additions & 1 deletion library/alloc/src/borrow.rs
View file
Original file line number Diff line number Diff line change
@@ -330,7 +330,11 @@ impl<B: ?Sized + ToOwned> Cow<'_, B> {
}

#[stable(feature = "rust1", since = "1.0.0")]
impl<B: ?Sized + ToOwned> Deref for Cow<'_, B> {
#[rustc_const_unstable(feature = "const_deref", issue = "88955")]
impl<B: ?Sized + ToOwned> const Deref for Cow<'_, B>
where
B::Owned: ~const Borrow<B>,
{
type Target = B;

fn deref(&self) -> &B {
6 changes: 4 additions & 2 deletions library/core/src/mem/manually_drop.rs
View file
Original file line number Diff line number Diff line change
@@ -145,7 +145,8 @@ impl<T: ?Sized> ManuallyDrop<T> {
}

#[stable(feature = "manually_drop", since = "1.20.0")]
impl<T: ?Sized> Deref for ManuallyDrop<T> {
#[rustc_const_unstable(feature = "const_deref", issue = "88955")]
impl<T: ?Sized> const Deref for ManuallyDrop<T> {
type Target = T;
#[inline(always)]
fn deref(&self) -> &T {
@@ -154,7 +155,8 @@ impl<T: ?Sized> Deref for ManuallyDrop<T> {
}

#[stable(feature = "manually_drop", since = "1.20.0")]
impl<T: ?Sized> DerefMut for ManuallyDrop<T> {
#[rustc_const_unstable(feature = "const_deref", issue = "88955")]
impl<T: ?Sized> const DerefMut for ManuallyDrop<T> {
#[inline(always)]
fn deref_mut(&mut self) -> &mut T {
&mut self.value
6 changes: 4 additions & 2 deletions library/core/src/ops/deref.rs
View file
Original file line number Diff line number Diff line change
@@ -76,7 +76,8 @@ pub trait Deref {
}

#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> Deref for &T {
#[rustc_const_unstable(feature = "const_deref", issue = "88955")]
impl<T: ?Sized> const Deref for &T {
type Target = T;

#[rustc_diagnostic_item = "noop_method_deref"]
@@ -89,7 +90,8 @@ impl<T: ?Sized> Deref for &T {
impl<T: ?Sized> !DerefMut for &T {}

#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> Deref for &mut T {
#[rustc_const_unstable(feature = "const_deref", issue = "88955")]
impl<T: ?Sized> const Deref for &mut T {
type Target = T;

fn deref(&self) -> &T {