this post was submitted on 21 Aug 2025
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Heapless (data structures for embedded) v0.9.1 has been released! (blog.rust-embedded.org)
submitted 8 months ago by sgued@programming.dev to c/rust@programming.dev
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This releases includes some pretty nice improvements to the usage of the crate.

If you want to know how the View types I talk about in the release post are built, take a look at my post from back when I contributed them:

https://sgued.fr/blog/heapless-howto/

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[–] Sivecano@lemmy.dbzer0.com 1 points 8 months ago (1 children)

alloca?

[–] Vorpal@programming.dev 2 points 8 months ago (1 children)

Not really. Heapless uses compile time sized backing buffers to implement Vec, string etc with a max upper size. You would typically use heapless with a statically allocated variable, but it is possible to use it on the stack too.

Alloca is different and allocates a dynamically sized block on the stack. Rust doesn't really support alloca, but there is a crate for it that works by calling through a helper function in C: https://lib.rs/crates/alloca

[–] Sivecano@lemmy.dbzer0.com 1 points 8 months ago

Awww. why doesn't rust do alloca actually?