viirya commented on code in PR #3289:
URL: https://github.com/apache/arrow-rs/pull/3289#discussion_r1043738826
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arrow-buffer/src/alloc/mod.rs:
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@@ -28,9 +28,18 @@ mod alignment;
pub use alignment::ALIGNMENT;
+/// Returns an aligned non null pointer similar to [`NonNull::dangling`]
+///
+/// Note that the pointer value may potentially represent a valid pointer,
which means
+/// this must not be used as a "not yet initialized" sentinel value.
+///
+/// Types that lazily allocate must track initialization by some other means.
#[inline]
-unsafe fn null_pointer() -> NonNull<u8> {
- NonNull::new_unchecked(ALIGNMENT as *mut u8)
+fn dangling() -> NonNull<u8> {
+ // SAFETY: ALIGNMENT is a non-zero usize which is then casted
+ // to a *mut T. Therefore, `ptr` is not null and the conditions for
Review Comment:
nit: there is no `ptr` so might be confused for some readers.
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