Cross-Referencing Classes

I have two classes: mRoom and mDoor. mRoom has an array of 10 mDoors in it, and mDoor has 2 pointers which hold the adjacent mRooms. I can't seem to get this into code.

NOTE: the main cpp file is just has the #include and a blank main function, with a return 0 statement.

Here's the header file:

Code:

---

#ifndef MSOLVE_H_
#define MSOLVE_H_

class mRoom
{
private:
        mDoor  exits[10];
public:
        mRoom( );
        ~mRoom( );
};

class mDoor
{
private:
        mRoom * adjRooms[2];
public:
        mDoor( );
        ~mDoor( );
};

#endif

---

And here are the errors:

Code:

---

--------------------Configuration: RoomMazeSol - Win32 Debug--------------------
Compiling...
main.cpp
c:\c++\roommazesol\msolve.h(7) : error C2146: syntax error : missing ';' before identifier 'exits'
c:\c++\roommazesol\msolve.h(7) : error C2501: 'mDoor' : missing storage-class or type specifiers
c:\c++\roommazesol\msolve.h(7) : error C2501: 'exits' : missing storage-class or type specifiers
Error executing cl.exe.

RoomMazeSol.exe - 3 error(s), 0 warning(s)

---

Code:

---

class mRoom;

class mDoor
{
private:
        mRoom * adjRooms[2];
public:
        mDoor( );
        ~mDoor( );
};

class mRoom
{
private:
        mDoor  exits[10];
public:
        mRoom( );
        ~mRoom( );
};

---

Here is the problem. You declare mRoom then mDoor. Your mRoom contains mDoor information but the compiler doesn't know about mDoor yet. Your mDoor is fine because above it is the mRoom declaration. So above your mRoom you need a forward declaration that will tell the compiler "There is in fact a mDoor class". It will look like this.

Code:

---

class mDoor;

---

Thanks. I got it to work using Pioneers method. MrWizards didn't.

Oops, because you aren't using a pointer in your mRoom class ( i.e. you have mDoor exits[10] not mDoor *exits[10] ) it will not work the way I suggested. I just spit the answer out a little too quickly I guess.