Least Recently Used cache using C++

Question

I am trying to implement LRU Cache using C++ . I would like to know what is the best design for implementing them. I know LRU should provide find(), add an element and remov

Answer 1

I would not make the cache visible to the outside world at all if I could avoid it. I'd just have a collection (of whatever) and handle the caching invisibly, adding and removing items as needed, but the external interface would be exactly that of the underlying collection.

As far as the implementation goes, a heap is probably the most obvious. It has complexities roughly similar to a map, but instead of building a tree from linked nodes, it arranges items in an array and the "links" are implicit based on array indices. This increases the storage density of your cache and improves locality in the "real" (physical) processor cache.