c-resources/CPlusPlus20ForProgrammers-m.../examples/ch09/fig09_33-35/fig09_35.cpp

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// fig09_35.cpp
// static data member tracking the number of objects of a class.
#include <fmt/format.h>
#include <iostream>
#include "Employee.h" // Employee class definition
int main() {
// no objects exist; use class name and scope resolution
// operator to access static member function getCount
std::cout << fmt::format("Initial employee count: {}\n",
Employee::getCount()); // use class name
// the following scope creates and destroys
// Employee objects before main terminates
{
const Employee e1{"Susan", "Baker"};
const Employee e2{"Robert", "Jones"};
// two objects exist; call static member function getCount again
// using the class name and the scope resolution operator
std::cout << fmt::format(
"Employee count after creating objects: {}\n\n",
Employee::getCount());
std::cout << fmt::format("Employee 1: {} {}\nEmployee 2: {} {}\n\n",
e1.getFirstName(), e1.getLastName(),
e2.getFirstName(), e2.getLastName());
}
// no objects exist, so call static member function getCount again
// using the class name and the scope resolution operator
std::cout << fmt::format(
"Employee count after objects are deleted: {}\n",
Employee::getCount());
}
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