Tracking Issue for const_split_off_first_last

[okaneco]

Feature gate: #![feature(const_split_off_first_last)]

This is a tracking issue for using <[T]>::split_off_* functions in const. These functions remove either the first or last element from a slice and return a reference or mutable reference to that element.

The original functions were stabilized with the slice_take feature.
slice_take tracking issue: #62280

Public API

impl<T> [T] {
    pub const fn split_off_first<'a>(self: &mut &'a Self) -> Option<&'a T>;
    pub const fn split_off_first_mut<'a>(self: &mut &'a mut Self) -> Option<&'a mut T>;
    pub const fn split_off_last<'a>(self: &mut &'a Self) -> Option<&'a T>;
    pub const fn split_off_last_mut<'a>(self: &mut &'a mut Self) -> Option<&'a mut T>;
}

Steps / History

• Implementation: core/slice: Mark some split_off variants unstably const #138540
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

Footnotes

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩