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also add is_empty to const raw slices #118231

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Merged
merged 1 commit into from
Nov 29, 2023
Merged

also add is_empty to const raw slices #118231

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also add is_empty to const raw slices
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@RalfJung
RalfJung committed Nov 24, 2023
commit a8162673e353a7e80925c5bb93687656656f108a
18 changes: 18 additions & 0 deletions library/core/src/ptr/const_ptr.rs
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Expand Up @@ -1644,6 +1644,24 @@ impl<T> *const [T] {
metadata(self)
}

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

/// Returns a raw pointer to the slice's buffer.
///
/// This is equivalent to casting `self` to `*const T`, but more type-safe.
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6 changes: 3 additions & 3 deletions library/core/src/ptr/mut_ptr.rs
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Expand Up @@ -1920,10 +1920,10 @@ impl<T> *mut [T] {
///
/// ```
/// #![feature(slice_ptr_len)]
/// use std::ptr;
///
/// let mut a = [1, 2, 3];
/// let ptr = &mut a as *mut [_];
/// assert!(!ptr.is_empty());
/// let slice: *mut [i8] = ptr::slice_from_raw_parts_mut(ptr::null_mut(), 3);
/// assert!(!slice.is_empty());
/// ```
#[inline(always)]
#[unstable(feature = "slice_ptr_len", issue = "71146")]
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