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Showing content from https://github.com/rust-lang/rust/issues/91613 below:

GitHub · Where software is built

Feature gate: #![feature(array_repeat)]

This is a tracking issue for creating a fixed-size array by repeatedly Cloning an item, or by repeatedly calling a possibly-fallible nullary FnMut.

// core::array

pub fn repeat<T: Clone, const N: usize>(value: T) -> [T; N];
pub fn repeat_with<T, const N: usize>(f: impl FnMut() -> T) -> [T; N];
pub fn try_repeat_with<R: Try, const N: usize>(
    f: impl FnMut() -> R,
) -> ChangeOutputType<R, [R::Output; N]>
where
    R::Residual: Residual<[R::Output; N]>;

• Implementation: Add resize(_with) and (try_)repeat(_with) for arrays #91506
• Final comment period (FCP)
• Stabilization PR

• repeat_with and try_repeat_with are very similar to from_fn and try_from_fn ( Tracking issue for try_array_from_fn #89379), just that they take nullary instead of unary functions. Anyone considering stabilizing these should think about those, and vice versa.

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