The following code example is taken from the book
Object-Oriented Programming in C++
by Nicolai M. Josuttis, Wiley, 2002
© Copyright Nicolai M. Josuttis 2002
#include <iostream>
#include "person.hpp"
int main()
{
std::cout << "number of people: " << CPPBook::Person::number()
<< std::endl;
CPPBook::Person nico("Josuttis", "Nicolai");
std::cout << "number of people: " << CPPBook::Person::number()
<< std::endl;
}