This crate implements a cache with frequency-based replacement strategy as described in the paper “Data Cache Management Using Frequency-Based Replacement” by John T. Robinson and Murthy V. Devarakonda, published in ACM SIGMETRICS 1990.

The configuration parameters of such a cache are:

• capacity: the number of slots
• Amax: the maximum average frequency count beyond which counts are aged. Aging will be performed roughly every _Amax * capacity_ cache hits. 100 is a reasonable default.
• C_max: the maximum frequency count for which eviction happens by count (above that: LRU). You will probably not need to tune this.

Example:

```rust use fbr_cache::FbrCache;

let mut cache = FbrCache::new(1000); cache.put(1, "hello"); cache.put(2, "world");

asserteq!(cache.get(&1), Some(&"hello")); asserteq!(cache.len(), 2); ```