From a37d42133cddf1f82bf8c3d29b48b6ec694f6f8d Mon Sep 17 00:00:00 2001 From: Scott McMurray Date: Sat, 17 Dec 2022 18:41:14 -0800 Subject: [PATCH] Another `as_chunks` example I really liked this structure that dtolney brought up in #105316, so wanted to put it in the docs to help others use it. --- library/core/src/slice/mod.rs | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs index 8bd2ed45c0a..2c469f61854 100644 --- a/library/core/src/slice/mod.rs +++ b/library/core/src/slice/mod.rs @@ -1002,6 +1002,17 @@ pub fn chunks_exact_mut(&mut self, chunk_size: usize) -> ChunksExactMut<'_, T> { /// assert_eq!(chunks, &[['l', 'o'], ['r', 'e']]); /// assert_eq!(remainder, &['m']); /// ``` + /// + /// If you expect the slice to be an exact multiple, you can combine + /// `let`-`else` with an empty slice pattern: + /// ``` + /// #![feature(slice_as_chunks)] + /// let slice = ['R', 'u', 's', 't']; + /// let (chunks, []) = slice.as_chunks::<2>() else { + /// panic!("slice didn't have even length") + /// }; + /// assert_eq!(chunks, &[['R', 'u'], ['s', 't']]); + /// ``` #[unstable(feature = "slice_as_chunks", issue = "74985")] #[inline] #[must_use]