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Stabilize UnsafeCell::from_mut

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This commit is contained in:
ltdk 2024-10-04 13:03:43 -04:00
parent 267cf8d3b2
commit 6828a1edc6
1 changed files with 3 additions and 2 deletions
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5
library/core/src/cell.rs
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@ -2115,7 +2115,6 @@ impl<T: ?Sized> UnsafeCell<T> {
/// # Examples
///
/// ```
/// # #![feature(unsafe_cell_from_mut)]
/// use std::cell::UnsafeCell;
///
/// let mut val = 42;
@ -2125,7 +2124,9 @@ impl<T: ?Sized> UnsafeCell<T> {
/// assert_eq!(*uc.get_mut(), 41);
/// ```
#[inline(always)]
#[unstable(feature = "unsafe_cell_from_mut", issue = "111645")]
#[stable(feature = "unsafe_cell_from_mut", since = "CURRENT_RUSTC_VERSION")]
#[rustc_const_stable(feature = "unsafe_cell_from_mut", since = "CURRENT_RUSTC_VERSION")]
#[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_mut_refs))]
pub const fn from_mut(value: &mut T) -> &mut UnsafeCell<T> {
// SAFETY: `UnsafeCell<T>` has the same memory layout as `T` due to #[repr(transparent)].
unsafe { &mut *(value as *mut T as *mut UnsafeCell<T>) }