lfu-cache:恒定时间LFU缓存的生锈实现-源码下载

高速缓存
大致基于的恒定时间最少使用（LFU）高速缓存的简单实现。
例子
use lfu_cache :: LfuCache;
let mut cache = LfuCache :: with_capacity ( 2 );
// Fill up the cache.
cache. insert ( "foo" , 3 );
cache. insert ( "bar" , 4 );
// Insert returns the evicted value, if a value was evicted, in case additional
// bookkeeping is necessary for the value to be dropped.
let maybe_evicted = cache. insert ( "baz" , 5 );
// In the case of a t
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