rust-embedded/heapless

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Heapless, `static` friendly data structures

Stars: 2k
Forks: 253
Open beginner issues: 1
Indexed issues: 51
Avg merge: 1d 2h
Merged PRs (30d): 1

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

Open All

`FromIterator` for `Deque` Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

rust-embedded/heapless#683 · Opened Aug 8, 2026
`mpmc`: Add optional exponential backoff Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

rust-embedded/heapless#681 · Opened Jul 30, 2026
IndexMap/IndexSet: implement `shift_remove` and variants Open

enhancement help wanted

Difficulty 3/5 1-2 days Newbie friendliness 68/100

rust-embedded/heapless#678 · Opened Jul 28, 2026
feat(pool::arc): expose manual reference counting Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 55/100

rust-embedded/heapless#653 · 1 comment · Opened Apr 12, 2026
LinearMap with explicit SIMD support? Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

rust-embedded/heapless#645 · 5 comments · 1 reaction · Opened Jan 30, 2026
Vec const-ness Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

rust-embedded/heapless#643 · 3 comments · Opened Jan 28, 2026
from_iter on heapless::String should be generic over any iterator that yields a type that implements AsRef<str> Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

rust-embedded/heapless#630 · 3 comments · Opened Nov 6, 2025
Add owning IntoIterator for IndexSet Open

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

rust-embedded/heapless#627 · 2 comments · Opened Nov 2, 2025
Fallout from the removal of `doc_auto_cfg` Open

Difficulty 1/5 Under an hour Newbie friendliness 52/100

rust-embedded/heapless#621 · 4 comments · Opened Oct 23, 2025
Streamline HistoryBuf interface Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

rust-embedded/heapless#613 · Opened Sep 19, 2025
Feature Request: Add Binary Search Tree (BST) Support to Heapless Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#608 · Opened Sep 17, 2025
Build error when compiling with `esp-idf` Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

rust-embedded/heapless#599 · 7 comments · Opened Aug 25, 2025
Performance regression for `HistoryBuf(fer)::write()` with heapless 0.9.1 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

rust-embedded/heapless#598 · 3 comments · Opened Aug 24, 2025
Add `View` version of `IndexMap` and `IndexSet` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#594 · Opened Aug 20, 2025
Would `heapless` accept a PR for a `Deque`/`RingBuffer` that operates on a mutable slice instead of allocating a buffer of a fixed size? Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

rust-embedded/heapless#589 · 5 comments · 1 reaction · Opened Aug 15, 2025
MpMcQueue can fail to push even when it's not full under contention Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 38/100

rust-embedded/heapless#583 · 21 comments · Opened Jul 7, 2025
Feature: add `Cow` type Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#582 · 1 comment · 1 reaction · Opened Jun 12, 2025
Bug: IndexMap fails to insert more than u16::MAX keys. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-embedded/heapless#579 · 4 comments · Opened May 24, 2025
Compile-time operations for `LinearMap` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#578 · 1 comment · Opened May 19, 2025
Add CopyVec and CopyString Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

rust-embedded/heapless#575 · 4 reactions · Opened May 1, 2025
Document all `unsafe` blocks. Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-embedded/heapless#562 · 7 comments · 2 reactions · Opened Apr 26, 2025
Replace `mpmc_large` feature using `LenType`. Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 35/100

rust-embedded/heapless#561 · 2 comments · 1 reaction · Opened Apr 26, 2025
Enhancement/Feature: port upstream IndexMap methods such as shift_remove Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#557 · Opened Apr 24, 2025
Possible data race in the iteration of Stack's pop and UnionNode Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-embedded/heapless#554 · 4 comments · Opened Apr 13, 2025
Implement generic `LenType` in other containers. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-embedded/heapless#551 · Opened Apr 11, 2025
Heapless 1.0 Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 15/100

rust-embedded/heapless#535 · 8 comments · Opened Mar 9, 2025
Provide drain for IndexMap. Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

rust-embedded/heapless#531 · 1 comment · Opened Mar 8, 2025
Implement bincode Writer and Reader traits for Vec Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-embedded/heapless#519 · 5 comments · 1 reaction · Opened Nov 29, 2024
Depending on platform-specific (arm_llsc) features from a library Open

enhancement question

Difficulty 5/5 Over a week Newbie friendliness 30/100

rust-embedded/heapless#516 · Opened Oct 15, 2024
feature: initialize with const Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

rust-embedded/heapless#515 · 4 comments · 2 reactions · Opened Oct 9, 2024
heapless Vec does not work good with stacked borrows, while std Vec does Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

rust-embedded/heapless#514 · 4 comments · 1 reaction · Opened Oct 8, 2024
`&mut LinearMap` does not implement `IntoIter` Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

rust-embedded/heapless#492 · Opened Jul 1, 2024
MpMcQueue drop implementation is not optimized Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

rust-embedded/heapless#489 · Opened Jul 1, 2024
BinaryHeap pop mixing elements of same order Open

question

Difficulty 4/5 3-5 days Newbie friendliness 30/100

rust-embedded/heapless#470 · Opened May 7, 2024
API alignment Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#442 · 19 comments · 1 reaction · Opened Jan 15, 2024
Alignment of internal arrays Open

enhancement question

Difficulty 5/5 Over a week Newbie friendliness 30/100

rust-embedded/heapless#380 · 2 comments · Opened Sep 29, 2023
Deserializing a string that exceeds the length: truncate? Open

enhancement question

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#379 · 3 comments · Opened Sep 22, 2023
Feature gating types Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

rust-embedded/heapless#372 · Opened Jul 19, 2023
#[track_caller] For functions like "from" that have unwrap() inside. Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

rust-embedded/heapless#357 · Opened Mar 11, 2023
Is it the rust equivalent of the "Embedded Template Library" in C++? Open

question

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

rust-embedded/heapless#356 · 3 comments · Opened Mar 11, 2023
Queue not thread/interrupt safe? Open

question

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-embedded/heapless#355 · 2 comments · Opened Mar 8, 2023
Feature: Support a fixed-dynamic-capacity Vec Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#353 · 1 comment · 2 reactions · Opened Mar 2, 2023
Feature request Implement defmt for FnvIndexMap Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

rust-embedded/heapless#346 · 2 reactions · Opened Feb 24, 2023
Feature request create a vec macro Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

rust-embedded/heapless#344 · 1 comment · Opened Feb 15, 2023
Infallible Vec operations Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#341 · 4 comments · Opened Jan 30, 2023
Add usize index methods to IndexMap Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

rust-embedded/heapless#325 · 1 comment · Opened Nov 20, 2022
Mutual referencing and self-referencing structures not possible with Vec, FnvIndexMap, SortedLinkedList but with std variants Open

bug status: blocked

Difficulty 4/5 3-5 days Newbie friendliness 48/100

rust-embedded/heapless#296 · 5 comments · Opened May 31, 2022
Should examples be marked as no_run instead of ignore? Open

question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

rust-embedded/heapless#270 · 1 comment · Opened Feb 14, 2022
The llsc stack is not safe from ABA with how LL/SC is used Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

rust-embedded/heapless#180 · 10 comments · Opened Oct 18, 2020
Serialize Vec<u8> as bytes Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-embedded/heapless#138 · Opened Dec 30, 2019

rust-embedded/heapless

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