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Add NonNull::<[T]>::is_empty. #122800

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Merged
merged 2 commits into from
Mar 22, 2024
Merged

Add NonNull::<[T]>::is_empty. #122800

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4250216
Add `NonNull::<[T]>::is_empty` as insta-stable.
zachs18 Mar 20, 2024
1b95760
Not insta-stable
zachs18 Mar 21, 2024
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19 changes: 19 additions & 0 deletions library/core/src/ptr/non_null.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1575,6 +1575,25 @@ impl<T> NonNull<[T]> {
self.as_ptr().len()
}

/// Returns `true` if the non-null raw slice has a length of 0.
///
/// # Examples
///
/// ```rust
/// #![feature(slice_ptr_is_empty_nonnull)]
/// use std::ptr::NonNull;
///
/// let slice: NonNull<[i8]> = NonNull::slice_from_raw_parts(NonNull::dangling(), 3);
/// assert!(!slice.is_empty());
/// ```
#[unstable(feature = "slice_ptr_is_empty_nonnull", issue = "71146")]
#[rustc_const_unstable(feature = "const_slice_ptr_is_empty_nonnull", issue = "71146")]
#[must_use]
#[inline]
pub const fn is_empty(self) -> bool {
self.len() == 0
}

/// Returns a non-null pointer to the slice's buffer.
///
/// # Examples
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