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Split MaybeUninit::write into new feature gate and stabilize it

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This commit is contained in:
est31 2021-06-16 02:47:05 +02:00
parent 607d6b00d4
commit 1c8033f77f
1 changed files with 6 additions and 8 deletions
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14
library/core/src/mem/maybe_uninit.rs
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@ -426,7 +426,6 @@ impl<T> MaybeUninit<T> {
/// Correct usage of this method:
///
/// ```rust
/// #![feature(maybe_uninit_extra)]
/// use std::mem::MaybeUninit;
///
/// let mut x = MaybeUninit::<Vec<u8>>::uninit();
@ -445,7 +444,6 @@ impl<T> MaybeUninit<T> {
/// This usage of the method causes a leak:
///
/// ```rust
/// #![feature(maybe_uninit_extra)]
/// use std::mem::MaybeUninit;
///
/// let mut x = MaybeUninit::<String>::uninit();
@ -456,8 +454,8 @@ impl<T> MaybeUninit<T> {
/// // x is initialized now:
/// let s = unsafe { x.assume_init() };
/// ```
#[unstable(feature = "maybe_uninit_extra", issue = "63567")]
#[rustc_const_unstable(feature = "maybe_uninit_extra", issue = "63567")]
#[stable(feature = "maybe_uninit_write", since = "1.55.0")]
#[rustc_const_unstable(feature = "const_maybe_uninit_write", issue = "63567")]
#[inline(always)]
pub const fn write(&mut self, val: T) -> &mut T {
*self = MaybeUninit::new(val);
@ -478,7 +476,7 @@ impl<T> MaybeUninit<T> {
/// use std::mem::MaybeUninit;
///
/// let mut x = MaybeUninit::<Vec<u32>>::uninit();
/// unsafe { x.as_mut_ptr().write(vec![0, 1, 2]); }
/// x.write(vec![0, 1, 2]);
/// // Create a reference into the `MaybeUninit<T>`. This is okay because we initialized it.
/// let x_vec = unsafe { &*x.as_ptr() };
/// assert_eq!(x_vec.len(), 3);
@ -897,9 +895,9 @@ impl<T> MaybeUninit<T> {
/// use std::mem::MaybeUninit;
///
/// let mut array: [MaybeUninit<i32>; 3] = MaybeUninit::uninit_array();
/// array[0] = MaybeUninit::new(0);
/// array[1] = MaybeUninit::new(1);
/// array[2] = MaybeUninit::new(2);
/// array[0].write(0);
/// array[1].write(1);
/// array[2].write(2);
///
/// // SAFETY: Now safe as we initialised all elements
/// let array = unsafe {