#ifndef EMPLOYEE_HH
#define EMPLOYEE_HH

#include <set>
#include <string>
#include <iostream>

using namespace std ;

class Employee {
    public:
      // Constructor
      Employee(const char* name, double salary) :
         _name(name),
         _salary(salary) {
      }

      // Accessors
      const char* name() const {
         return _name.c_str() ;
      }
      double salary() const {
         return _salary ;
      }

    private:
      string _name ;
      double _salary ;

} ;

class Manager : public Employee {
    public:
      //Constructor
      Manager(const char* _name, double _salary):
         Employee(_name, _salary),
         _subordinates() {
      }

      // Accessors/Modifiers
      void addSubordinate(Employee& empl) {
         _subordinates.insert(empl) ;     // Error: no macthing function call for .insert()
      }

    private:
      set<Employee*> _subordinates ;

} ;

#endif

#include <string>
#include <iostream>
#include "Employee.hh"

using namespace std ;

int main() {

    Employee emp = ("David", 10000) ;

    Manager mgr = ("Oscar", 20000) ;

    mgr.addSubordinate(emp);

    return 0;

}