C++ program. Singleton Design Pattern. Maps.

1. You may find incorporating map s into your program very helpful. Write the code for a class ElectoralMap that implements the singleton design pattern. When instantiated, this ElectoralMap should assign unique ids to 4 different District s and store them in a map with id mapping to District. Use a static field to help with the unique ids. i. Your District s should be a regular class. ii. You should override the operator