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Make transpose const and inline #103127

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Merged
merged 1 commit into from
Oct 19, 2022
Merged

Make transpose const and inline #103127

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1 change: 1 addition & 0 deletions library/core/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -217,6 +217,7 @@
#![feature(unboxed_closures)]
#![feature(unsized_fn_params)]
#![feature(asm_const)]
#![feature(const_transmute_copy)]
//
// Target features:
#![feature(arm_target_feature)]
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6 changes: 4 additions & 2 deletions library/core/src/mem/maybe_uninit.rs
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Expand Up @@ -1297,7 +1297,8 @@ impl<T, const N: usize> MaybeUninit<[T; N]> {
/// let data: [MaybeUninit<u8>; 1000] = MaybeUninit::uninit().transpose();
/// ```
#[unstable(feature = "maybe_uninit_uninit_array_transpose", issue = "96097")]
pub fn transpose(self) -> [MaybeUninit<T>; N] {
#[inline]
pub const fn transpose(self) -> [MaybeUninit<T>; N] {
// SAFETY: T and MaybeUninit<T> have the same layout
unsafe { super::transmute_copy(&ManuallyDrop::new(self)) }
}
Expand All @@ -1316,7 +1317,8 @@ impl<T, const N: usize> [MaybeUninit<T>; N] {
/// let data: MaybeUninit<[u8; 1000]> = data.transpose();
/// ```
#[unstable(feature = "maybe_uninit_uninit_array_transpose", issue = "96097")]
pub fn transpose(self) -> MaybeUninit<[T; N]> {
#[inline]
pub const fn transpose(self) -> MaybeUninit<[T; N]> {
// SAFETY: T and MaybeUninit<T> have the same layout
unsafe { super::transmute_copy(&ManuallyDrop::new(self)) }
}
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