#include <iostream>

using namespace std;

// we need this so that BuddyT "knows" that a PalT definition is coming.
class PalT;

class BuddyT {
   friend void TalkAboutBuddyT(BuddyT & buddy);
   friend class PalT;
   public:
      BuddyT()= default;

      // delay implimentation until after PalT is declared.
      void DoBuddysMatch(const PalT & pal); 
   private:
      string name{"buddy"};
      int contacts{0};
};

void TalkAboutBuddyT(BuddyT & buddy);

class PalT {
   friend class BuddyT;
   public:
      PalT(BuddyT buddy): myBuddy{buddy} {};

      void HelpBuddy(void) {
          ++myBuddy.contacts;
      }

      BuddyT & ShareBuddy(void) {
         return myBuddy;
      }

      void RatOutBuddy(void) const {
          cout << "In PalT My Buddy is: " << myBuddy.name << endl;
          cout << "\t contacts: " << myBuddy.contacts << endl;
      }

   private:
      BuddyT myBuddy;
};

void BuddyT::DoBuddysMatch(const PalT & pal) {
    if (pal.myBuddy.contacts == contacts
        and pal.myBuddy.name == name) {
         cout << "Oh boy, this Pal's buddy matches me." << endl;
    } else {
       cout << "Sadness, their buddy is not the same as me" << endl;
    }
}

int main() {
    BuddyT buddy;
    PalT pal(buddy);

    buddy.DoBuddysMatch(pal);

    pal.HelpBuddy();
    pal.RatOutBuddy();

    TalkAboutBuddyT(pal.ShareBuddy());
    pal.RatOutBuddy();

    return 0;
}

void TalkAboutBuddyT(BuddyT & buddy) {
     cout << "In TalkAboutBuddyT My Buddy is: " << buddy.name << endl;
     cout << "\t contacts: " << buddy.contacts << endl;

     ++buddy.contacts;
}