Tracking Issue for `const_ref_cell`

[Daniel-Aaron-Bloom]

Feature gate: #![feature(const_ref_cell)]

This is a tracking issue for using RefCell in a const context.

Public API

// core::cell

impl<T> RefCell<T>
    pub const fn replace(&self, t: T) -> T;
    pub const fn swap(&self, other: &Self);
}

impl<T: ?Sized> RefCell<T> {
    pub const fn borrow(&self) -> Ref<'_, T>;
    pub const fn try_borrow(&self) -> Result<Ref<'_, T>, BorrowError>;
    pub const fn borrow_mut(&self) -> RefMut<'_, T>;
    pub const fn try_borrow_mut(&self) -> Result<RefMut<'_, T>, BorrowMutError>;
    pub const fn as_ptr(&self) -> *mut T;
    pub const fn get_mut(&mut self) -> &mut T;
    pub const fn undo_leak(&mut self) -> &mut T;
    pub const unsafe fn try_borrow_unguarded(&self) -> Result<&T, BorrowError>;
}

impl<'b, T: ?Sized> Ref<'b, T> {
    pub const fn clone(orig: &Ref<'b, T>) -> Ref<'b, T>;
    pub const fn leak(orig: Ref<'b, T>) -> &'b T;
}

impl<'b, T: ?Sized> RefMut<'b, T> {
    pub const fn leak(mut orig: RefMut<'b, T>) -> &'b mut T;
}

Steps

• Implementation: make RefCell unstably const #137843
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

Footnotes

Footnotes

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

[Daniel-Aaron-Bloom]

@rustbot label S-tracking-unimplemented

[Daniel-Aaron-Bloom]

@rustbot label -S-tracking-unimplemented +S-tracking-needs-to-bake