Проверять наличие пустых комнат в приключенческой игре?

Я работаю над Приключенческой игрой для проекта C ++. Цель состоит в том, чтобы иметь несколько комнат, определенных классом. Затем свяжите их все вместе, используя карту. У меня все работает, кроме проверки, нет ли места, и проверки того, что вход не используется для пустой комнаты. Например, он сказал бы: «Там ничего нет», а затем повторно оповестит пользователя о направлении движения. В настоящее время моя программа просто падает, если в направлении нет места и это направление выбрано. В настоящее время он настроен так, чтобы по крайней мере убедиться, что введено правильное направление (север, юг, восток или запад), но он не проверяет, доступно ли это направление. Кто-нибудь знает хороший способ сделать это?

main.cpp

    #include <iostream>
#include <string>
#include <map>

#include "room.h"
using namespace std;

int main()
{
/* ---------- Variable Declerations ---------- */
string exitChoice;

/* ---------- Room Intialization ---------- */
room *kitchen = new room("Kitchen", "You are in the Kitchen. Pots and pans dangle above your head as you look across the room.");
room *diningRoom = new room("Dining Room", "You are in the Dining Room. You see a large table in the center of the room complete with a set of chairs. It seems no one has ate here in quite som time.");
room *garage = new room("Garage", "You are in the Garage. There are tools spread across the concerte floor complete with a Jeep Grand Cherokee on jack stands.");
room *masterBed = new room("Master Bed Room", "You are in the Bed Room. A large Master Bed greets you as you walk into the room. You can see a large master bath as weel in the backround");
room *hallway = new room("Hallway", "You are in the Hallway. A large set of stairs leads to the second floor, complete with a set to the basement. You also see a grand front door.");
room *familyRoom = new room("Family Room", "You are in the Family Room. You see a dark leather couch in front of you as well as a brand new LCD TV. It aappears South Park is on TV.");
room *bathRoom = new room("Bath Room", "You are in the Bath Room. A small room containing just a toilet is in front of you.");
room *frontLawn = new room("Front Lawn", "You are in the Front Lawn. You are on a pathway and observe freshly cut grass as well as several trees scattered across the yard.");
room *backLawn = new room("Back Lawn", "You are in the Back Lawn. You see 'Spot' running around chasing a tennis ball, as well as his dog house. A large wooden fence keeps him in the yard.");

/* ----------Room Links---------- */

/* Kitchen */
kitchen->link(diningRoom, "North");
kitchen->link(garage, "East");
kitchen->link(masterBed, "South");
kitchen->link(hallway, "West");

/* Dining Room */
diningRoom->link(kitchen, "South");
diningRoom->link(familyRoom, "West");

/* Master Bed Room */
masterBed->link(kitchen, "North");
masterBed->link(bathRoom, "West");

/* Garage */
garage->link(kitchen, "West");
garage->link(backLawn, "East");

/* Back Lawn */
backLawn->link(garage, "West");

/* Family Room */
familyRoom->link(diningRoom, "East");
familyRoom->link(hallway, "South");

/* Hallway */
hallway->link(familyRoom, "North");
hallway->link(kitchen, "East");
hallway->link(bathRoom, "South");
hallway->link(frontLawn, "West");

/* Front Lawn */
frontLawn->link(hallway, "East");

/* Bath Room */
bathRoom->link(hallway, "North");
bathRoom->link(masterBed, "East");

/* ----------Gameplay---------- */
room *currentRoom = kitchen;

while (exitChoice != "quit")
{
currentRoom->printRoom();
cout << endl;

currentRoom->printLiked();

cout << "Which exit? (Or 'quit'):";
cin >> exitChoice;

if(exitChoice != "quit" && exitChoice != "North" && exitChoice != "South" && exitChoice != "East" && exitChoice != "West")
{
cout << "Invalid Entry!" << endl;
cout << "Which exit? (Or 'quit'):";
cin >> exitChoice;
}

cout << "You move to the " << exitChoice << "..." << endl;
currentRoom->getLinked(exitChoice);

currentRoom = currentRoom->getLinked(exitChoice);
}
}

room.h

#ifndef ROOM_H
#define ROOM_H

using namespace std;

#include <string>
#include <iostream>
#include <map>

class room
{
private:
string name;
string description;

public:

/* Constructor Prototypes */
room(string, string);
room(string);

/* Get Name */
string getName()
{
return name;
}

/* Get Description */
string getDescription()
{
return description;
}

/* Print Room Information */
void room :: printRoom()
{
cout << "--" << getName() << "--" << endl;
cout << getDescription() << endl;
}

/* Map */
map<string, room*> exits;

/* Link Function*/
void link(room *room, string direction)
{
exits[direction] = room;
}

/* Print Linked Rooms */
void printLiked()
{
map<string, room*> :: iterator it;

cout << endl;

for(it = exits.begin(); it != exits.end(); ++it)
{
cout << "Exit: ";
cout << it->first << " (" << it->second->getName() << ")" << endl;

}

cout << endl;
}

/* Get linked room */
room* getLinked(string direction)
{
map<string, room*> :: iterator it;

it = exits.find(direction);

if(it != exits.end())
{
return it->second;
}
else
{
return NULL;
}}
};

#endif

room.cpp

 #include <iostream>
#include <string>
#include <map>

using namespace std;

#include "room.h"
/* Constructor with Name and Description */
room :: room(string _name, string _description)
{
name = _name;
description = _description;
}/* Contrsuctor with Name */
room :: room(string _name)
{
name = _name;
}

новый фрагмент main.cpp

        room* possibleNewRoom = currentRoom->getLinked(exitChoice);

if (possibleNewRoom != 0)
{
currentRoom = possibleNewRoom;

cout << "You move to the " << exitChoice << "..." << endl;
currentRoom->getLinked(exitChoice);

currentRoom = currentRoom->getLinked(exitChoice);
}
else
{
cout << "There are no exits in that direction." << endl;
}