Tracking Issue for `arc_is_unique`

[SabrinaJewson]

Feature gate: #![feature(arc_is_unique)]

This is a tracking issue for Arc::is_unique, a function that allows determining whether there is exactly one strong count and zero weak counts to an Arc.

Public API

// alloc::sync

impl<T> Arc<T> {
    pub fn is_unique(this: &Self) -> bool;
}

Steps / History

• ACP: Expose Arc::is_unique libs-team#560
• Implementation: Add Arc::is_unique #138939
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

Footnotes

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

[tgross35]

IMO we should also have this method on Rc. It isn't needed for the same synchronization reasons, but it would be nice for consistency and convenience.