ostream& operator<<(ostream os, const Lobby& aLobby)
{
Player *pIter = aLobby.m_pHead;
os << "\nHere's who's in the game lobby:\n";
if(pIter == 0)
{
os << "The lobby is empty.\n";
}
else
{
while(pIter != 0)
{
os << pIter->GetName() << endl;
pIter = pIter->GetNext();
}
}
return os;
}
here is the whole code for the whole program to see it in its context.
// Game Lobby
// Stimulates a game lobby where players wait
#include <iostream>
#include <string>
using namespace std;
class Player
{
public:
Player(const string& name = ""):m_Name(name) , m_pNext(0) {}
string GetName() const { return m_Name; }
Player *GetNext() const { return m_pNext; }
void setNext(Player *next) { m_pNext = next; }
private:
string m_Name;
Player *m_pNext; // Pointer to next player in list
};
class Lobby
{
//friend ostream& operator<<(ostream os, const Lobby& aLobby);
public:
Lobby(): m_pHead(0) {}
~Lobby() { Clear(); }
void AddPlayer();
void RemovePlayer();
void Clear();
private:
Player *m_pHead;
};
void Lobby::AddPlayer()
{
// create a new player node
cout << "Please enter the name of the new player: ";
string name;
cin >> name;
Player *pNewPlayer = new Player(name);
//if list is empty, make head of list this new player
if(m_pHead == 0)
{
m_pHead = pNewPlayer;
}
// else find the end of the list and add the player there
else
{
Player *pIter = m_pHead;
while(pIter->GetNext() != 0)
{
pIter = pIter->GetNext();
}
pIter->setNext(pNewPlayer);
}
}
void Lobby::RemovePlayer()
{
if(m_pHead == 0)
{
cout << "The game lobby is empty. No one to remove!\n";
}
else
{
Player * pTemp = m_pHead;
m_pHead = m_pHead->GetNext();
delete pTemp;
}
}
void Lobby::Clear()
{
while (m_pHead != 0)
{
RemovePlayer();
}
}
ostream& operator<<(ostream os, const Lobby& aLobby)
{
Player *pIter = aLobby.m_pHead;
os << "\nHere's who's in the game lobby:\n";
if(pIter == 0)
{
os << "The lobby is empty.\n";
}
else
{
while(pIter != 0)
{
os << pIter->GetName() << endl;
pIter = pIter->GetNext();
}
}
return os;
}
int main()
{
Lobby myLobby;
int choice;
do
{
cout << myLobby;
cout << "\nGAME LOBBY\n";
cout << "0 - Exit the program.\n";
cout << "1 - Add a player to the lobby.\n";
cout << "2 - Remove a player from the lobby.\n";
cout << "3 - Clear the lobby.\n";
cout << endl << "Enter choice: ";
cin >> choice;
switch(choice)
{
case 0: cout << "Good-Bye.\n"; break;
case 1: myLobby.AddPlayer(); break;
case 2: myLobby.RemovePlayer(); break;
case 3: myLobby.Clear(); break;
default: cout << "That was not a valid choice.\n";
}
}
while (choice != 0);
return 0;
}
I understand what the code is doing like I said but I am curious why it wont compile. My understanding of the error is that it is not being allowed to access m_pHead at the beginning of the overloaded operator function beacuse it is private in the Lobby class. But since the function is declared a friend function in the Lobby class shouldnt it be allowed to access m_pHead. That is my understanding of friend functions.