temp

#include <boost/shared_ptr.hpp>
#include <iostream>

class Base {

};
typedef boost::shared_ptr<Base> BasePtr;

class DerivedA: public Base {

};
typedef boost::shared_ptr<DerivedA> DerivedAPtr;

class DerivedB: public Base {

};
typedef boost::shared_ptr<DerivedB> DerivedBPtr;

int main() {
  BasePtr ptr = BasePtr(new DerivedA);
  if (typeid(ptr.get()) == typeid(DerivedA *)) {
    std::cout << "DerivedA";
  } else if (typeid(ptr.get()) == typeid(Base *)) {
    std::cout << "Base";
  } else if (typeid(ptr.get()) == typeid(DerivedB *)) {
    std::cout << "DerivedB";
  }
}