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One of the nice aspects of evictors is that you do not need to change anything in your servant implementation: the servants are ignorant of the fact that an evictor is in use.This makes it very easy to add an evictor to an already existing code base with little disturbance of the source code.Which version is more appropriate depends on your application: if locating and evicting servants is expensive, and memory is not at a premium, the first version (which only scans the tail section) is more appropriate; if you want to keep memory consumption to a minimum, the second version is more appropriate.Also keep in mind that the difference between the two versions is significant only if you have long-running operations and many concurrent invocations from clients; otherwise, there is no point in more aggressively scanning for servants to remove because they are going to become idle again very quickly and get evicted as soon as the next request arrives.This is useful when the time comes to evict a servant: instead of having to search the map for the identity of the servant to be evicted, we can simply delete the map entry that is pointed at by the iterator at the tail of the queue.
Usually iterator should know about its own internal state only.
I have an application that implements a Doubly Connected Edge List (DCEL): struct edge_t ; std::vector edges; Starting from some edge, one traverses the data structure by nested function calls.
For instance, "the point at the origin of the previous of the current edge's inverse edge" would be referred to as something like point_t p = points[edges[edges[edges[n].inverse].previous].origin]; where n is the indes of the current edge.
The C Programming Language Bjarne Stroustrup, 3rd edition Chapter 1 - Notes to the reader When you program, you create a concrete representation of the ideas in your solution to some problem.
functions are called by the evictor when it needs to add a new servant to the queue and when it evicts a servant from the queue.
then takes care of maintaining the cache in least-recently used order and evicting servants as necessary.