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CoffeeBlend 2021-01-01 22:56:54 +01:00
parent 0ff1e6c697
commit 72a3dee16f
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2 changed files with 10 additions and 14 deletions
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18
library/core/src/mem/maybe_uninit.rs
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@ -804,12 +804,12 @@ impl<T> MaybeUninit<T> {
} }
} }
/// Extracts the values from an array of `MaybeUninit` containers. /// Extracts the values from an array of `MaybeUninit` containers.
/// ///
/// # Safety /// # Safety
/// ///
/// It is up to the caller to guarantee that all elements of the array are /// It is up to the caller to guarantee that all elements of the array are
/// in an initialized state. /// in an initialized state.
/// ///
/// # Examples /// # Examples
/// ///
@ -817,17 +817,17 @@ impl<T> MaybeUninit<T> {
/// #![feature(maybe_uninit_uninit_array)] /// #![feature(maybe_uninit_uninit_array)]
/// #![feature(maybe_uninit_array_assume_init)] /// #![feature(maybe_uninit_array_assume_init)]
/// use std::mem::MaybeUninit; /// use std::mem::MaybeUninit;
/// ///
/// let mut array: [MaybeUninit<i32>; 3] = MaybeUninit::uninit_array(); /// let mut array: [MaybeUninit<i32>; 3] = MaybeUninit::uninit_array();
/// array[0] = MaybeUninit::new(0); /// array[0] = MaybeUninit::new(0);
/// array[1] = MaybeUninit::new(1); /// array[1] = MaybeUninit::new(1);
/// array[2] = MaybeUninit::new(2); /// array[2] = MaybeUninit::new(2);
/// ///
/// // SAFETY: Now safe as we initialised all elements /// // SAFETY: Now safe as we initialised all elements
/// let array = unsafe { /// let array = unsafe {
/// MaybeUninit::array_assume_init(array) /// MaybeUninit::array_assume_init(array)
/// }; /// };
/// ///
/// assert_eq!(array, [0, 1, 2]); /// assert_eq!(array, [0, 1, 2]);
/// ``` /// ```
#[unstable(feature = "maybe_uninit_array_assume_init", issue = "none")] #[unstable(feature = "maybe_uninit_array_assume_init", issue = "none")]
@ -846,9 +846,7 @@ impl<T> MaybeUninit<T> {
unsafe { unsafe {
intrinsics::assert_inhabited::<T>(); intrinsics::assert_inhabited::<T>();
let array = ArrayInit { let array = ArrayInit { maybe_uninit: ManuallyDrop::new(array) };
maybe_uninit: ManuallyDrop::new(array),
};
ManuallyDrop::into_inner(array.init) ManuallyDrop::into_inner(array.init)
} }
} }

6
library/core/tests/mem.rs
View File

@ -149,10 +149,8 @@ fn uninit_array_assume_init() {
array[3].write(1); array[3].write(1);
array[4].write(5); array[4].write(5);
let array = unsafe { let array = unsafe { MaybeUninit::array_assume_init(array) };
MaybeUninit::array_assume_init(array)
};
assert_eq!(array, [3, 1, 4, 1, 5]); assert_eq!(array, [3, 1, 4, 1, 5]);
} }