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Make Borrow and BorrowMut impls const

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This commit is contained in:
woppopo 2021-12-04 21:57:39 +09:00
parent 68a698baf6
commit 8f68bdc380
2 changed files with 14 additions and 7 deletions
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6
library/core/src/array/mod.rs
View File

@ -149,14 +149,16 @@ impl<T, const N: usize> AsMut<[T]> for [T; N] {
}
#[stable(feature = "array_borrow", since = "1.4.0")]
impl<T, const N: usize> Borrow<[T]> for [T; N] {
#[rustc_const_unstable(feature = "const_borrow", issue = "91522")]
impl<T, const N: usize> const Borrow<[T]> for [T; N] {
fn borrow(&self) -> &[T] {
self
}
}
#[stable(feature = "array_borrow", since = "1.4.0")]
impl<T, const N: usize> BorrowMut<[T]> for [T; N] {
#[rustc_const_unstable(feature = "const_borrow", issue = "91522")]
impl<T, const N: usize> const BorrowMut<[T]> for [T; N] {
fn borrow_mut(&mut self) -> &mut [T] {
self
}

15
library/core/src/borrow.rs
View File

@ -205,7 +205,8 @@ pub trait BorrowMut<Borrowed: ?Sized>: Borrow<Borrowed> {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> Borrow<T> for T {
#[rustc_const_unstable(feature = "const_borrow", issue = "91522")]
impl<T: ?Sized> const Borrow<T> for T {
#[rustc_diagnostic_item = "noop_method_borrow"]
fn borrow(&self) -> &T {
self
@ -213,28 +214,32 @@ impl<T: ?Sized> Borrow<T> for T {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> BorrowMut<T> for T {
#[rustc_const_unstable(feature = "const_borrow", issue = "91522")]
impl<T: ?Sized> const BorrowMut<T> for T {
fn borrow_mut(&mut self) -> &mut T {
self
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> Borrow<T> for &T {
#[rustc_const_unstable(feature = "const_borrow", issue = "91522")]
impl<T: ?Sized> const Borrow<T> for &T {
fn borrow(&self) -> &T {
&**self
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> Borrow<T> for &mut T {
#[rustc_const_unstable(feature = "const_borrow", issue = "91522")]
impl<T: ?Sized> const Borrow<T> for &mut T {
fn borrow(&self) -> &T {
&**self
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> BorrowMut<T> for &mut T {
#[rustc_const_unstable(feature = "const_borrow", issue = "91522")]
impl<T: ?Sized> const BorrowMut<T> for &mut T {
fn borrow_mut(&mut self) -> &mut T {
&mut **self
}