Use dynamic_cast to replace typeid : dynamic_cast « Pointer « C++ Tutorial

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2. Pointer
3. dynamic_cast

#include <iostream>
#include <typeinfo>
using namespace std;

class Base {
public:
  virtual void f() {}
};

class Derived : public Base {
public:
  void derivedOnly() {
    cout << "Is a Derived Object.\n";
  }
};

int main()
{
  Base *bp, b_ob;
  Derived *dp, d_ob;

  // use typeid
  bp = &b_ob;
  if(typeid(*bp) == typeid(Derived)) {
    dp = (Derived *) bp;
    dp->derivedOnly();
  }
  else
    cout << "Cast from Base to Derived failed.\n";

  return 0;
}

Cast from Base to Derived failed.