Tracking Issue for const `array::from_fn`

[fee1-dead]

Feature gate: #![feature(const_array_from_fn)]

This is a tracking issue for using array::from_fn in const contexts

Public API

// core::array

pub const fn from_fn<T, const N: usize, F>(cb: F) -> [T; N]
where
    F: ~const FnMut(usize) -> T + ~const Destruct,
    T: ~const Destruct;
   
pub const fn try_from_fn<R, const N: usize, F>(cb: F) -> ChangeOutputType<R, [R::Output; N]>
where
    F: ~const FnMut(usize) -> R + ~const Destruct,
    R: ~const Try,
    R::Residual: ~const Residual<[R::Output; N]>,
    R::Output: ~const Destruct;

Steps / History

• Implementation: Constified array::from_fn and ptr::drop_in_place #109122
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

Footnotes

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