Expand description
An implementation of a LRU cache. The cache supports get
, get_mut
, put
,
and pop
operations, all of which are O(1). This crate was heavily influenced
by the [LRU Cache implementation in an earlier version of Rust’s std::collections crate] (https://doc.rust-lang.org/0.12.0/std/collections/lru_cache/struct.LruCache.html).
Example
extern crate lru;
use lru::LruCache;
fn main() {
let mut cache = LruCache::new(2);
cache.put("apple", 3);
cache.put("banana", 2);
assert_eq!(*cache.get(&"apple").unwrap(), 3);
assert_eq!(*cache.get(&"banana").unwrap(), 2);
assert!(cache.get(&"pear").is_none());
cache.put("pear", 4);
assert_eq!(*cache.get(&"pear").unwrap(), 4);
assert_eq!(*cache.get(&"banana").unwrap(), 2);
assert!(cache.get(&"apple").is_none());
{
let v = cache.get_mut(&"banana").unwrap();
*v = 6;
}
assert_eq!(*cache.get(&"banana").unwrap(), 6);
}
Structs
An LRU Cache