// Make Database a Singleton

#include <iostream>
#include <vector>
using std::vector;
using std::ostream;
using std::endl;
using std::cout;

class Student {
public:
   Student() : name(new char[1]), gpa(0), cuid(0) { }
   Student(char* n, float g, int c) : name(new char[strlen(n)+1]), 
           gpa(g), cuid(c) { }
   Student(const Student& stu) : name(new char[strlen(stu.name)+1]),
      gpa(stu.gpa), cuid(stu.cuid) { }
   ~Student() { delete [] name; }
private:
   char* name;
   float gpa;
   int cuid;
};

class Database {
public:
  static Database* getInstance() {
    if (!databaseInstance) databaseInstance = new Database;
    return databaseInstance;
  }
  void insert(const Student& s)  { students.push_back(s); }
  unsigned int size() const { return students.size(); }
private:
  Database() {}
  Database(const Database&) {}
  Database& operator=(const Database&) { return *this; }
  static Database* databaseInstance;
  vector<Student> students;
};

Database * Database::databaseInstance = NULL;

int main() {
   Database * data = Database::getInstance();
   data->insert( Student("Ben", 3.9, 27) );
   data->insert( Student("Waldo", 1.5, 17) );
   std::cout << data->size() << std::endl;
   return 0;
}