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android / platform / external / rust / crates / hashlink / 0927990edf14645203e733b6556a968b7f4177f6
commit0927990edf14645203e733b6556a968b7f4177f6[log] [tgz]
authorJoel Galenson <[email protected]>Wed Dec 15 18:07:18 2021 +0000
committerAutomerger Merge Worker <[email protected]>Wed Dec 15 18:07:18 2021 +0000
tree3c2abb16a61cdcb6c665836da86505adbc9db9e0
parentf631b074a6f93f9e8054a896f49d209f06cd4cbb [diff]
parent2311c71102b9d1d4c356d43068d60152b9699d99 [diff]
Refresh Android.bp, cargo2android.json, TEST_MAPPING. am: 86898edaca am: 5754917cf8 am: b2d4c77a1d am: 2311c71102

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/hashlink/+/1912712

Change-Id: Icb338d5a87f8aa3dc6015c68a53c818770768acf
tree: 3c2abb16a61cdcb6c665836da86505adbc9db9e0
  1. .circleci/
  2. src/
  3. tests/
  4. LICENSE ⇨ LICENSE-APACHE
  5. .cargo_vcs_info.json
  6. .gitignore
  7. Android.bp
  8. Cargo.toml
  9. Cargo.toml.orig
  10. cargo2android.json
  11. CHANGELOG.md
  12. LICENSE-APACHE
  13. LICENSE-MIT
  14. METADATA
  15. MODULE_LICENSE_APACHE2
  16. OWNERS
  17. README.md
  18. TEST_MAPPING
README.md

hashlink -- HashMap-like containers that hold their key-value pairs in a user controllable order

Build Status Latest Version API Documentation

This crate is a fork of linked-hash-map that builds on top of hashbrown to implement more up to date versions of LinkedHashMap LinkedHashSet, and LruCache.

One important API change is that when a LinkedHashMap is used as a LRU cache, it allows you to easily retrieve an entry and move it to the back OR produce a new entry at the back without needlessly repeating key hashing and lookups:

let mut lru_cache = LinkedHashMap::new();
let key = "key".to_owned();
// Try to find my expensive to construct and hash key
let _cached_val = match lru_cache.raw_entry_mut().from_key(&key) {
    RawEntryMut::Occupied(mut occupied) => {
        // Cache hit, move entry to the back.
        occupied.to_back();
        occupied.into_mut()
    }
    RawEntryMut::Vacant(vacant) => {
        // Insert expensive to construct key and expensive to compute value,
        // automatically inserted at the back.
        vacant.insert(key.clone(), 42).1
    }
};

Or, a simpler way to do the same thing:

let mut lru_cache = LinkedHashMap::new();
let key = "key".to_owned();
let _cached_val = lru_cache
    .raw_entry_mut()
    .from_key(&key)
    .or_insert_with(|| (key.clone(), 42));

This crate contains a decent amount of unsafe code from handling its internal linked list, and the unsafe code has diverged quite a lot from the original linked-hash-map implementation. It currently passes tests under miri and sanitizers, but it should probably still receive more review and testing, and check for test code coverage.

Credit

There is a huge amount of code in this crate that is copied verbatim from linked-hash-map and hashbrown, especially tests, associated types like iterators, and things like Debug impls.

License

This library is licensed the same as linked-hash-map and hashbrown, it is licensed under either of:

at your option.