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Showing content from https://github.com/rust-lang/rust/issues/90091 below:

Tracking Issue for split_array · Issue #90091 · rust-lang/rust · GitHub

Feature gate: #![feature(split_array)]

This is a tracking issue for splitting slices and arrays into constant-length arrays.

impl<T, const N: usize> [T; N] {
    pub fn split_array_ref<const M: usize>(&self) -> (&[T; M], &[T]);
    pub fn split_array_mut<const M: usize>(&mut self) -> (&mut [T; M], &mut [T]);

    pub fn rsplit_array_ref<const M: usize>(&self) -> (&[T], &[T; M]);
    pub fn rsplit_array_mut<const M: usize>(&mut self) -> (&mut [T], &mut [T; M]);
}

Similar functions for slices have already been stabilized as:

impl [T] {
    pub const fn split_first_chunk<const N: usize>(&self) -> Option<(&[T; N], &[T])>;
    pub fn split_first_chunk_mut<const N: usize>(&mut self) -> Option<(&mut [T; N], &mut [T])>;
    pub const fn split_last_chunk<const N: usize>(&self) -> Option<(&[T], &[T; N])>;
    pub fn split_last_chunk_mut<const N: usize>(&mut self) -> Option<(&mut [T], &mut [T; N])>;
}

See #111774

• Naming, see Implement split_array and split_array_mut #83233 (review)
• Array functions should return [T; N - M], like so:

impl<T, const N: usize> [T; N] {
    pub fn split_array<const M: usize>(self) -> ([T; M], [T; N - M]);
    pub fn split_array_ref<const M: usize>(&self) -> (&[T; M], &[T; N - M]);
    pub fn split_array_mut<const M: usize>(&mut self) -> (&mut [T; M], &mut [T; N - M]);
}

However, const generics is not powerful enough for this today. See #83233 (comment) and #83233 (comment).

thaliaarchi, soooch, qm3ster, krnak, Xiretza and 23 more

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