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  1. #include <iostream>
  2.  
  3. 		class Employee { /* fill in rest as before */
  4. 		public:
  5. 		    Employee(/*...*/) { /* ... */
  6. 		        getCounter()++;
  7. 		    }
  8. 		    ~Employee(/*...*/) { /* ... */
  9. 		        getCounter()--;
  10. 		    }
  11.  
  12. 		    static auto getCount() -> std::size_t {
  13. 		        return getCounter();
  14. 		    }
  15. 		private:
  16. 		    // replace counter static field in class context,
  17. 		    //    with counter static variable in function context
  18. 		    static auto getCounter() -> std::size_t& {
  19. 		        static std::size_t counter = 0;
  20. 		        return counter;
  21. 		    }
  22. 		};
  23.  
  24. int main() {
  25. 	std::cout << "Initial employee count = " << Employee::getCount() << std::endl;
  26.  
  27. 	Employee emp1 {};
  28. 	std::cout << "Count after an employee created = " << Employee::getCount() << std::endl;
  29.  
  30. 	{
  31. 		Employee emp2 {};
  32. 		std::cout << "Count after another employee created = " << Employee::getCount() << std::endl;
  33. 	}
  34. 	std::cout << "Count after an employee removed = " << Employee::getCount() << std::endl;
  35.  
  36. 	return 0;
  37. }
Success #stdin #stdout 0s 3412KB
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stdin
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Standard input is empty
stdout
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Initial employee count = 0
Count after an employee created = 1
Count after another employee created = 2
Count after an employee removed = 1
https://ideone.com/6xN0h3
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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