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// Remainder of code unchanged...
 
void f(const Employee *e) {
  if (e) {
    std::cout << *e;
  }
}

int main() {
  Employee coder("Joe Smith");
  Employee typist("Bill Jones");
  Manager designer("Jane Doe", typist);
  
  f(&coder);
  f(&typist);
  f(&designer);
}

Employee: Joe Smith
Employee: Bill Jones
Manager: Jane Doe
Assistant: 
	Employee: Bill Jones

// ... Remainder of code unchanged ...
 
void f(const Employee &e) {
  std::cout << e;
}

int main() {
  Employee coder("Joe Smith");
  Employee typist("Bill Jones");
  Manager designer("Jane Doe", typist);
  
  f(coder);
  f(typist);
  f(designer);
}

#include <iostream>
#include <memory>
#include <string>
#include <vector>

void f(const std::vector<std::unique_ptr<Employee>> &v) {
  for (const auto &e : v) {
    std::cout << *e;
  }
}

int main() {
  std::vector<std::unique_ptr<Employee>> v;
  
  v.emplace_back(new Employee("Joe Smith"));
  v.emplace_back(new Employee("Bill Jones"));
  v.emplace_back(new Manager("Jane Doe", *v.front()));
  
  f(v);
}