#include <iostream>
#include <list>
#include <string>

class A
{
	public:
		std::string value;
		A() : value("okay") {}
};

class B
{
	public:
		void func(std::string v) { std::cout << v << std::endl; }
};

int main()
{
	A* pa = new A();
	B* pb = new B();
	std::list<A*> pal;
	std::list<B*> pbl;
	pal.push_back(pa);
	pbl.push_back(pb);
	std::list<A*>::iterator ia = pal.begin();
	std::list<B*>::iterator ib = pbl.begin();
	(*ib)->func((*ia)->value);
	return 0;
}