forward definition of c++ class member functions

forward definition of c++ class member functions

I'm writing a small generator which outputs c++ classes in a single cpp
file from a tree object structure ( order of output of classes is given by
this tree, so its fixed).
To keep it simple I would prefer if there is a way to keep it all in one
file.
The problem is that these classes sometimes interact with each other using
the member functions and there is the case that forward declarations arent
working.
Example:
#include <iostream>
using namespace std;
class B;
B* global_b=NULL;
class A;
A* global_a=NULL;
class A {
public:
A() {}
~A() {}
void accessB()
{
global_b->setValue(1);
}
int getValue()
{
return 2;
}
};
class B {
public:
B() : j(0) {}
~B(){}
void setValue(int i)
{
j = i + global_a->getValue();
}
int j;
};
int main()
{
global_b = new B();
global_a = new A();
global_a->accessB();
cout << "Hello world!" << endl;
return 0;
}
Any suggestions/ideas? Thanks.