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Add helper functions for Array<MaybeUninit<T>, U> #8

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merged 4 commits into from
Jan 11, 2024
Merged

Add helper functions for Array<MaybeUninit<T>, U> #8

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1582c18
Add helper functions for `Array<MaybeUninit<T>, U>`
tarcieri Jan 11, 2024
8bd2cf9
Override clippy lint
tarcieri Jan 11, 2024
94b05e5
Expand safety comment on uninit and add test
tarcieri Jan 11, 2024
d7f32a4
More explicit typing for `MaybeUninit` functions
tarcieri Jan 11, 2024
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25 changes: 25 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -217,6 +217,31 @@ where
}
}

impl<T, U> Array<MaybeUninit<T>, U>
where
U: ArraySize,
{
/// Create an uninitialized array of [`MaybeUninit`]s for the given type.
pub const fn uninit() -> Self {
// SAFETY: an array of `MaybeUninit`s is always valid.
#[allow(clippy::uninit_assumed_init)]
unsafe {
MaybeUninit::uninit().assume_init()
}
}

/// Extract the values from an array of `MaybeUninit` containers.
///
/// # Safety
///
/// It is up to the caller to guarantee that all elements of the array are in an initialized
/// state.
pub unsafe fn assume_init(self) -> Array<T, U> {
// TODO(tarcieri): use `MaybeUninit::array_assume_init` when stable
ptr::read(self.as_ptr().cast())
}
}

impl<T, U> AsRef<[T]> for Array<T, U>
where
U: ArraySize,
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