Extension trait to chunk iterators into const-length arrays.

Related tags

Command-line rust adapter iterator chunk
Overview

const-chunks

This crate provides an extension trait that lets you chunk iterators into constant-length arrays using const generics.

See the docs for more info.

use const_chunks::IteratorConstChunks;

let mut iter = vec![1, 2, 3, 4, 5].into_iter().const_chunks::<2>();
assert_eq!(iter.next(), Some([1,2]));
assert_eq!(iter.next(), Some([3,4]));
assert_eq!(iter.next(), None);

let mut remainder = iter.into_remainder().unwrap();
assert_eq!(remainder.next(), Some(5));
assert_eq!(remainder.next(), None);

Safety

This crate uses unsafe to manipulate uninitialized memory.

To prevent undefined behaviour, the code runs MIRI in CI, and is both very short and easy to audit.

Nevertheless, you should still consider this fact if you're trying to minimize unsafe dependencies.

MSRV

This crate requires rustc version 1.65 or newer.

This crate's MSRV is enforced through the manifest's rust-version key.

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

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Comments
  • Memory leak if underlying `Iterator::next` panics.

    Memory leak if underlying `Iterator::next` panics.

    Panics prevent the cleanup code from running. This is problematic when under a catch_unwind or similar mechanism (common in multi-threaded applications).

    This could be fixed by using a guard similar to https://github.com/rust-lang/rust/blob/19ca5692f69d20643656bf501fd171f1907ef875/library/core/src/array/mod.rs#L888-L899. If no panic is detected, we can std::mem::forget the guard. If there is a panic, then the guard's Drop impl will cleanup any remaining memory.

    Thanks to ScottMCM and Elomatreb for pointing this out.

    opened by LouisGariepy 0
Owner
Louis Gariépy
Physics graduate. Interested in dev tools and systems programming.
Louis Gariépy
GitHub
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