Hey there i am looking for some help with the exercises in my book for c++. The first ch9 exercise states: "Improve the lobby class from the Game Lobby program by writing a copy constructor and an overloaded assignment operator for it." I am confused on what i am doing here i have re read the chapter three times and can not make sense of it . i added these two lines to the lobby class but i dont know if this is correct or how to make it correct if it is not

class Lobby
{
	friend ostream& operator<<(ostream& os, const Lobby& aLobby)
        Lobby& operator=(const Lobby& c) //OVERLOADED ASSIGNMENT OPERATOR I ADDED DO NOT KNOW IF THIS WORKS
		
public:
	Lobby(): m_pHead(0) {}
	~Lobby() { Clear(); }
	Lobby(const lobby& c) // COPY CONSTRUCTOR I ADDED DONT KNOW IT THIS IS CORRECT	
	{	
          cout << "Copy constructor called";
		
	}
	
	void AddPlayer();
	void RemovePlayer();
	void Clear();
private:
	Player* m_pHead;
};

//Game lobby
//Simulates 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 = next; }
	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)
        Lobby& operator=(const Lobby& c) //OVERLOADED ASSIGNMENT OPERATOR I ADDED DO NOT KNOW IF THIS WORKS
		
public:
	Lobby(): m_pHead(0) {}
	~Lobby() { Clear(); }
	Lobby(const lobby& c) // COPY CONSTRUCTOR I ADDED DONT KNOW IT THIS IS CORRECT	
	{	
          cout << "Copy constructor called";
		
	}
	
	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 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 = pNewPlayerl
	}
	//otherwise 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_pHeadl
		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 << "\nGameLobby\n";
		cout << "0 - Exit the programm.\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;
}

The second exercise states: " The lobby::AddPlayer() function is inefficient because it iterates through all of the player nodes to add a new player to the end of the line. Add an m_pTail pointer data member to the Lobby class that always points to the last node in the line and use it to more efficiently add a player." I have no idea how to add this so if anyone could please help that would be amazing thank you :).