CS 202 Fall 2013
In-Class Challenge for Tuesday, September 24, 2013

This challenge deals with a C++ class CountMe. It is initially specified as follows. What you are actually to do is found below.

Class CountMe Initial Specification

• Class CountMe should be implemented in header file countme.h and source file countme.cpp.
• Class CountMe should have a private static member variable that keeps track of how many objects of type CountMe currently exist.
  • So it needs to be modified in each constructor and in the destructor, right? It also needs to be initialized to zero.
• Class CountMe should have a default constructor.
• You may write other public functions, but do not write any accessors.
• There should be a global function howMany that returns the number of CountMe objects that currently exist. This global function should have access to the private data of class CountMe.
• As always, the class should be implemented according to standard conventions regarding header & source file separation, etc.
• The const qualifier should be used correctly.
• Your package should compile with program test_countme.cpp.

What to Do

Do as many of the following as you can before class ends. After each, please show me your work.

1. Write a minimal version of files countme.h and countme.cpp that compile with the test program test_countme.cpp.
2. Implement class CountMe as above, so that all tests pass.
3. Add an additional option to the class: keep track of how many constructor calls and how many destructor calls there have been for class CountMe. Write a program that demonstrates this functionality. The resulting class should still compile with the test program and pass all tests.