commit | 186c81c3c755580451d082c2edf02ccfe86ed721 | [log] [tgz] |
---|---|---|
author | Joel Galenson <jgalenson@google.com> | Tue May 25 23:39:52 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Tue May 25 23:39:52 2021 +0000 |
tree | 88390f1a9f0ab00e0ed8b47c06a1b2bf73d448d3 | |
parent | 737afc8506046121e4b14027bcaeea7022b75e1a [diff] | |
parent | 8d96501639f9cb6866f07f460b41ce62d999923e [diff] |
Upgrade rust/crates/hashlink to 0.7.0 am: e30d42e8fe am: eb62f240b9 am: 8d96501639 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/hashlink/+/1712276 Change-Id: I01ac3794c9a7f7cc54814312e11216cf2259fb15
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.
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.
This library is licensed the same as linked-hash-map and hashbrown, it is licensed under either of:
at your option.