gistfile1.cpp

#include <list>
#include <iostream>

class Base {
public:
  typedef void (*func_each)(Base*);
private:
  typedef std::list<Base*> instances_list;
  static instances_list _SM_instances;
public:
  Base() {
    _SM_instances.push_back(this);
  }
  virtual ~Base() {}
  virtual int my_method() = 0;
  static void each_instance(func_each func) {
    for(instances_list::iterator i = _SM_instances.begin(); i != _SM_instances.end(); ++i)
      func(*i);
  }
};

std::list<Base*> Base::_SM_instances;

class Child1 : public Base {
public:
  int my_method() {
    std::cout << "Child1\n";
  }
};

class Child2 : public Base {
public:
  int my_method() {
    std::cout << "Child2\n";
  }
};

class Child3 : public Base {
public:
  int my_method() {
    std::cout << "Child3\n";
  }
};

class Child4 : public Base {
public:
  int my_method() {
    std::cout << "Child4\n";
  }
};

void call_mymethod(Base* b) {
  b->my_method();
}

int main() {
  Child1 a;
  Child2 b;
  Child3 c;
  Child4 d;

  Base::each_instance(call_mymethod);
}