Game Lobby Program

[fishirboy]

I am having a debug error i can't find saying:

Error 2 error LNK2019: unresolved external symbol "public: __thiscall Lobby::Lobby(vo id)" (??0Lobby@@QAE@ XZ) referenced in function _main

and

Error 1 error LNK2019: unresolved external symbol "public: __thiscall Lobby::~Lobby(v oid)" (??1Lobby@@QAE@ XZ) referenced in function _main

and

Error 3 error LNK1120: 2 unresolved externals

#include "stdafx.h"
#include <iostream>
#include <string>

using namespace std;

class Player
{
public:
	Player(const string& name = "");
	string GetName() const;
	Player* GetNext() const;
	void SetNext(Player* next);

private:
	string m_Name;
	Player* m_pNext;
};

Player::Player(const string& name):
m_Name(name),
	m_pNext(0)
{}

string Player:: GetName() const
{
	return m_Name;
}

Player* Player::GetNext() const
{
	return m_pNext;
}

void Player::SetNext(Player* next)
{
	m_pNext = next;
}

class Lobby
{
	friend ostream& operator << (ostream& os, const Lobby& aLobby);

public:
	Lobby();
	~Lobby();
	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;
	}
	//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_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 << "\nGAMELOBBY\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-buy.\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);

	system("pause");
	return 0;
}

[weaknessforcats]

There's no code for Lobby::Lobby().

Be sure your member functions are coded in a .cpp fie and only the class declaration should be in the header file.