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Rollup merge of #88887 - fee1-dead:const-deref, r=oli-obk

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Const Deref

Implements `const Deref`/`const DerefMut` for `&mut T`, `&T`, `Cow<'_, B>` and `ManuallyDrop<T>`
This commit is contained in:
Yuki Okushi 2021-09-17 14:09:48 +09:00 committed by GitHub
commit 5d14396ed0
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 13 additions and 5 deletions
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6
library/alloc/src/borrow.rs
View File

@ -330,7 +330,11 @@ pub fn into_owned(self) -> <B as ToOwned>::Owned {
}
#[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
library/core/src/mem/manually_drop.rs
View File

@ -145,7 +145,8 @@ pub unsafe fn drop(slot: &mut 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 @@ fn deref(&self) -> &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
library/core/src/ops/deref.rs
View File

@ -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 @@ fn deref(&self) -> &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 {