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library/ptr: mention that ptr::without_provenance is equivalent to deriving from the null ptr #121935

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Merged
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Mar 4, 2024
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library/ptr: mention that ptr::without_provenance is equivalent to deriving from the null ptr #121935

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4 changes: 4 additions & 0 deletions library/core/src/ptr/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -574,6 +574,8 @@ pub const fn null_mut<T: ?Sized + Thin>() -> *mut T {

/// Creates a pointer with the given address and no provenance.
///
/// This is equivalent to `ptr::null().with_addr(addr)`.
///
/// Without provenance, this pointer is not associated with any actual allocation. Such a
/// no-provenance pointer may be used for zero-sized memory accesses (if suitably aligned), but
/// non-zero-sized memory accesses with a no-provenance pointer are UB. No-provenance pointers are
Expand Down Expand Up @@ -616,6 +618,8 @@ pub const fn dangling<T>() -> *const T {

/// Creates a pointer with the given address and no provenance.
///
/// This is equivalent to `ptr::null_mut().with_addr(addr)`.
///
/// Without provenance, this pointer is not associated with any actual allocation. Such a
/// no-provenance pointer may be used for zero-sized memory accesses (if suitably aligned), but
/// non-zero-sized memory accesses with a no-provenance pointer are UB. No-provenance pointers are
Expand Down