// B2a.cpp

#include <iostream>
#include <string>
using namespace std;

class dataSet {

  public:
    string& accessString(const string &password) {
      static string safe = " access not allowed ";
      if(password == "abracadabra")
        return sharedString;
      return safe;
    }
  private:
    static string sharedString;
};

string dataSet::sharedString = "";

void main() {

  dataSet shared1;
  dataSet shared2;

  shared1.accessString("abracadabra") = " client1 access ";
  shared2.accessString("abracadabra") += " client2 access ";
  shared1.accessString("hackAttempt") = " got in ";

  cout << "\n  shared data: " << shared2.accessString("abracadabra");
  cout << "\n\n";
}