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Showing content from https://github.com/rust-lang/rust/issues/71146 below:

Tracking Issue for raw slice len() method (slice_ptr_len, const_slice_ptr_len) · Issue #71146 · rust-lang/rust · GitHub

This is a tracking issue for the len() method on raw slice pointers, which allows to get the length of a raw slice pointer when conversion to a slice reference would be UB (because the pointer is null or unaligned).

It covers the feature gates #![feature(slice_ptr_len)] and #![feature(const_slice_ptr_len)] (for const fn).

impl<T> *mut [T] {
    pub const fn len(self) -> usize;
    pub const fn is_empty(self) -> bool;
}

impl<T> *const [T] {
    pub const fn len(self) -> usize;
    pub const fn is_empty(self) -> bool;
}

impl<T> NonNull<[T]> {
    pub const fn len(self) -> usize; // Already stable
    pub const fn is_empty(self) -> bool;
}

• ptr: introduce len() method on raw slices #71082
• Add len and slice_from_raw_parts to NonNull<[T]> #71940
• Additional *mut [T] methods #95594
• also add is_empty to const raw slices #118231
• Add NonNull::<[T]>::is_empty. #122800
• Final commenting period (FCP)
• Stabilization PR

• Potential blocker: rustc performs auto-ref when a raw pointer would be enough #73987

TianyiShi2001, mexus, ilyavennik, yvt, stepancheg and 2 morekornelskistanislav-tkach and mexus

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