Tracking Issue for `OnceCell/Lock::get_mut_or_init`

Feature gate: #![feature(once_cell_get_mut)]

This is a tracking issue for

• OnceCell::get_mut_or_init()
• OnceCell::get_mut_or_try_init()
• OnceLock::get_mut_or_init()
• OnceLock::get_mut_or_try_init()

Public API

    pub fn get_mut_or_try_init<F, E>(&mut self, f: F) -> Result<&mut T, E>
    where
        F: FnOnce() -> Result<T, E> { ... }

    pub fn get_mut_or_init<F>(&mut self, f: F) -> &mut T
    where
        F: FnOnce() -> T { ... }

Steps / History

• ACP: https://github.com/rust-lang/libs-team/issues/294
• Implementation: https://github.com/rust-lang/rust/pull/114788
• Final comment period (FCP)
• Stabilization PR

Unresolved Questions

None yet.

Footnotes

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

Read the stabilization procedure in the Rust Dev Guide and review the completed implementation in rust-lang/rust#114788, along with the ACP in libs-team#294. The tracking issue is done when the final comment period is complete and a stabilization PR has been created and merged.