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Avoid some manual slice length calculation

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No need for us to write the multiplication when `size_of_val` does exactly what we need.
This commit is contained in:
Scott McMurray 2023-04-07 01:32:12 -07:00
parent 7f6edd3f15
commit 1042b5df9b
1 changed files with 4 additions and 12 deletions
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16
library/core/src/mem/maybe_uninit.rs
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@ -1241,13 +1241,9 @@ impl<T> MaybeUninit<T> {
/// ```
#[unstable(feature = "maybe_uninit_as_bytes", issue = "93092")]
pub fn slice_as_bytes(this: &[MaybeUninit<T>]) -> &[MaybeUninit<u8>] {
let bytes = mem::size_of_val(this);
// SAFETY: MaybeUninit<u8> is always valid, even for padding bytes
unsafe {
slice::from_raw_parts(
this.as_ptr() as *const MaybeUninit<u8>,
this.len() * mem::size_of::<T>(),
)
}
unsafe { slice::from_raw_parts(this.as_ptr() as *const MaybeUninit<u8>, bytes) }
}
/// Returns the contents of this mutable slice of `MaybeUninit` as a mutable slice of
@ -1274,13 +1270,9 @@ impl<T> MaybeUninit<T> {
/// ```
#[unstable(feature = "maybe_uninit_as_bytes", issue = "93092")]
pub fn slice_as_bytes_mut(this: &mut [MaybeUninit<T>]) -> &mut [MaybeUninit<u8>] {
let bytes = mem::size_of_val(this);
// SAFETY: MaybeUninit<u8> is always valid, even for padding bytes
unsafe {
slice::from_raw_parts_mut(
this.as_mut_ptr() as *mut MaybeUninit<u8>,
this.len() * mem::size_of::<T>(),
)
}
unsafe { slice::from_raw_parts_mut(this.as_mut_ptr() as *mut MaybeUninit<u8>, bytes) }
}
}