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use array::from_ref for slices

This commit is contained in:
Bastian Kauschke 2020-09-23 21:33:45 +02:00
parent ed97b42105
commit 5b3016134f
1 changed files with 3 additions and 10 deletions
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13
library/core/src/slice/raw.rs
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@ -1,5 +1,6 @@
//! Free functions to create `&[T]` and `&mut [T]`.
use crate::array;
use crate::intrinsics::is_aligned_and_not_null;
use crate::mem;
use crate::ptr;
@ -140,19 +141,11 @@ pub unsafe fn from_raw_parts_mut<'a, T>(data: *mut T, len: usize) -> &'a mut [T]
/// Converts a reference to T into a slice of length 1 (without copying).
#[stable(feature = "from_ref", since = "1.28.0")]
pub fn from_ref<T>(s: &T) -> &[T] {
// SAFETY: a reference is guaranteed to be valid for reads. The returned
// reference cannot be mutated as it is an immutable reference.
// `mem::size_of::<T>()` cannot be larger than `isize::MAX`.
// Thus the call to `from_raw_parts` is safe.
unsafe { from_raw_parts(s, 1) }
array::from_ref(s)
}
/// Converts a reference to T into a slice of length 1 (without copying).
#[stable(feature = "from_ref", since = "1.28.0")]
pub fn from_mut<T>(s: &mut T) -> &mut [T] {
// SAFETY: a mutable reference is guaranteed to be valid for writes.
// The reference cannot be accessed by another pointer as it is an mutable reference.
// `mem::size_of::<T>()` cannot be larger than `isize::MAX`.
// Thus the call to `from_raw_parts_mut` is safe.
unsafe { from_raw_parts_mut(s, 1) }
array::from_mut(s)
}