value type
key type (string by default)
Number of elements within the cache
Returns an iterator by the cache keys
Clears the cache by the specified filter and returns a map of removed keys
Returns an iterator from the cache that produces pairs of keys and values
Returns a value from the cache by the specified key
Returns true if a value by the specified key exists in the cache
Returns an iterator by the cache keys
Removes a value from the cache by the specified key
Saves a value to the cache by the specified key
Returns an iterator by the cache values
Base interface for a cache data structure