Как записать без вложения класса в класс?

[WIN32APIist]

class A
{
public:
	class B
	{
	public:
		A* pA;
		B(int y)
		{
			this->y=y;
			pA=new A(y+1,this);
		}
	private:
		int y;
};

	B *pB;
	A(int x,B* pB)
	{
		this->x=x;
		this->pB=pB;
	}
private:
	int x;
};

[pproger]

class B;

class A {
public:
	A(int x,B* pB)
	{
		this->x=x;
		this->pB=pB;
	}

private:
	int x;
	B *pB;
};

class B {
public:
	B(int y)
	{
		this->y=y;
		pA=new A(y+1,this);
	}

private:
	int y;
	A* pA;
};

[WIN32APIist]

Благодарю!