LRUCacheProperties.swift

class LRUCache<T: Hashable, U> {

    /// Total capacity of the LRU cache.
    private(set) var capacity: UInt
    /// LinkedList will store elements that are most accessed at the head and least accessed at the tail.
    private(set) var linkedList = DoublyLinkedList<CachePayload<T, U>>()
    /// Dictionary that will store the element, U, at the specified key.
    private(set) var dictionary = [T: Node<CachePayload<T, U>>]()

    /// LRUCache requires a capacity which must be greater than 0
    required init(capacity: UInt) {
        self.capacity = capacity
    }
}