#include <iostream>
#include <string>

using namespace std;

/*
struct NodeT;
class ListT{
    private:
        NodeT * head;
}
*/

class Friend2;

class Friend1 {
     friend  Friend2;
     public:
         void UpdateFriend(Friend2 & buddy);
         void Spill() {
            cout << "My data is " << myData << endl;
         }
     private:
         string myData;
};

class Friend2 {
     friend Friend1;
     public:
         void Spill() {
            cout << "My note says " << note << endl;
         }
         void MakeFriend(Friend1 & buddy) {
            buddy.myData = "I have a friend";
         }
     private:
         string note;
};

void Friend1::UpdateFriend(Friend2 & buddy) {
      buddy.note = "My Friend updated me";
}

int main(){
    Friend1 a;
    Friend2 b;

    cout << "Before " << endl;
    a.Spill();
    b.Spill();
    cout << endl;

    a.UpdateFriend(b);
    b.MakeFriend(a);

    cout << "After " << endl;
    a.Spill();
    b.Spill();

    return 0;
}