Member of class A calling member of class B

[nand]

Hello,

I know this may be a dumb question, I've searched in google and forums with no luck. Please help me get this code to work:

I want to call a member function of class B from a member of class A, and I can't seem to get the syntax right, the problem is at lines 10-11, the compiler error is: cyclic_dep.cpp:11:7: error: request for member 'print' in 'b', which is of non-class type 'B*'

#include <iostream>
using namespace std;

class B;

class A
{
	public:
	void print () { cout << "\n A::print() "; };
	void printb(B * b)  // <-
	{ *b.print(); }     // <-
	;
};

class B
{
	public:
	void print () { cout << "\n B::print() "; };
};

int main ()
{
	A a;
	B b;
	a.print();
	b.print();
	cout << endl;
}

Andrei

[webJose]

I believe it is because in the forward declaration you do not declare the print() method (and you cannot declare it in forward declarations).

Since class B doesn't depend on class A, define class B before class A and forget about line 4 (the forward declaration).

[coder777]

The class B must be declared before class A otherwise anything of class B is unknown to class A

[nand]

Thank you all for your replyes,
this works:

#include <iostream>
using namespace std;

class B
{
	public:
	void print () { cout << "\n B::print() "; };
};

class A
{
	public:
	void print () { cout << "\n A::print() "; };
	void printb(B * b) 
	{ 
		cout << "\n A::printb() ";
		b->print(); 
		}
	;
};

int main ()
{
	A a;
	B b;
	a.print();
	b.print();
	B * bp = &b;
	a.printb( bp );
	cout << endl;
}

Andrei