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.
Example
extern crate lru;
use lru::LruCache;
use std::num::NonZeroUsize;
fn main() {
let mut cache = LruCache::new(NonZeroUsize::new(2).unwrap());
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());
assert_eq!(cache.put("banana", 4), Some(2));
assert_eq!(cache.put("pear", 5), None);
assert_eq!(*cache.get(&"pear").unwrap(), 5);
assert_eq!(*cache.get(&"banana").unwrap(), 4);
assert!(cache.get(&"apple").is_none());
{
let v = cache.get_mut(&"banana").unwrap();
*v = 6;
}
assert_eq!(*cache.get(&"banana").unwrap(), 6);
}Structs
An iterator that moves out of a
LruCache.An iterator over the entries of a
LruCache.An iterator over mutables entries of a
LruCache.An LRU Cache