#include <iostream>
#include <vector>
using std::string;

class Student {
public:
  Student(const string& n) : name(n) {}
  const string& getName() const { return name; }
  void setName(const string& n) { name = n; }
private:
  string name;
};
std::ostream& operator<<(std::ostream& out, const Student& stu) {
  out << stu.getName();
  return out;
}


class Database {
public:
  static Database* getInstance() {
    if ( instance == NULL ) instance = new Database;
    return instance;
  }
  void insert(const Student& stu) {
    students.push_back(stu);
  }
  void print() {
    std::cout << "The data is/are:" << std::endl;
    for (unsigned int i = 0; i < students.size(); ++i) {
      std::cout << students[i] << std::endl;
    }
  }
private:
  std::vector<Student> students;
  Database() {}
  static Database* instance;
};

Database* Database::instance = NULL;

void doit() {
  Database * data = Database::getInstance();
  data->insert(Student("Ross"));
  data->print();
}

int main() {
  Database * data = Database::getInstance();
  data->insert(Student("Joseph"));
  data->insert(Student("Steve"));
  data->insert(Student("Jonathan"));
  data->print();
  doit();
  data->print();
  return 0;
}