forward declaration

[l2u]

Hello

I'm having problems with compiling..
The error I'm getting is: error C2079: 'A::m_b' uses undefined class 'B'


header1:

#include "header2.hpp"
class B;
class A {
public:
	B m_b;
};

header2:

#include "header1.hpp"
class A;
class B {
public:
	A &m_a;
};

What am I doing wrong?

[laserlight]

I think that it should be:

#include "header2.hpp"

class A {
public:
	B m_b;
};

class A;
class B {
public:
	A &m_a;
};

[CornedBee]

A has a value member of type B. Therefore, it needs the entire definition. The declaration is only enough for the reference member, as B has.

[l2u]

Now I get 3 errors:
error C2146: syntax error : missing ';' before identifier 'm_b'
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

[l2u]

A has a value member of type B. Therefore, it needs the entire definition. The declaration is only enough for the reference member, as B has.

What should I do then?

[laserlight]

Now I get 3 errors:

What code did you try? Note that you did not include header guards in your original example, so I omitted them as well.

What should I do then?

CornedBee basically explained what I illustrated.

[l2u]

Thanks for help..
I found out there was another class (C) that was causing the problem when I changed it to what you said.

I had to change class C in the same way, and now it works.
Thanks again!