Comment by strainer

I expect ideas of mapping functions are only a couple of hundred years old at most, and really quite obscure to most people who are just familiar with the concept of 'maps' and 'mapping' things 'out'.

In functional programming I understand map as just a clone and convert operation. I noticed C++ has a 'map' data structure which is most suitable for associating references. A C++ map is not suitable for storing positions in space.