Doesn't recognise my class

This is a little hard to explain, but here goes.
I have two classes which are defined in separate header files. For the sake of this message, I'm just call them 'Class1' and 'Class2'
These two classes use each other, so I tried to do this:

In Class1's header file

Code:

---

#include <Class2.h>

---

In Class2's header file

Code:

---

#include <Class1.h>

---

Both headers have '#pragma once' to avoid redefinition errors.

The problem is then when the Class1 symbol is used in the Class2 header, it is not recognised (and vice verse).

Maybe I've not explained this well enough, but I'll try to be more specific if you ask.

Im a newbie to classes (programming in general, actually) so if this is off base please forgive me. Instead of using brackets <>, use quotation marks. Make sure the header files are in the same folder as the project, though.

#include "myclass.h"

sorry, I do use quotation marks,

Code:

---

#include "Class1.h"

---

I'm still having bother with this, can anyone help?

It's quite tricky. One of the headers must contain a forward reference to the class from the other:

Code:

---

// header1

#pragma once

class class2;

class class1
{
};

// header2

#pragma once

#include "header1"

class class2
{
};

---

The question is: which should have the reference, and which should include the other?

The answer is: if one of the two classes contains an object (not a pointer or reference) to the other, it needs the header included.
If neither do, it doesn't matter.

If each references members of the other in inline code, you must put it outside of the class like this:

Code:

---

// header1

#pragma once

class class2;

class class1
{
  void func1();
};

#include "header2"

inline void class1::func1()
{
}

// header2

#pragma once

#include "header1"

class class2
{
};

---