Polymorphism and vectors

[Anakreon <anakreonmejdi at yahoo dot gr>]

I have a little problem with polymorphism and vectors.

Consider the example in the attached file

The output of the program is:
4base, 2b1, 2b2, 2b3
P4base
P4base
P4base

4base
4base
4base

Why are the descendants of class "base" are returned as instances of class "base"?
Is there a solution to this problem?

Thanks is advance,
Anakreon

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

class base {
public:
  virtual ~base() {}
};
class b1 : public base {};
class b2 : public base {};
class b3 : public base {};

int main() {
  cout << typeid(base).name() << ", "
	   << typeid(b1).name() << ", "
	   << typeid(b2).name() << ", "
	   << typeid(b3).name() << endl;
  vector<base*> vect;
  vect.push_back(new b1);
  vect.push_back(new b2);
  vect.push_back(new b3);
  for (vector<base*>::iterator it = vect.begin();
	   it != vect.end(); it++) {
	cout << typeid(*it).name() << endl;
  }

  cout << endl;

  vector<base> v2;
  v2.push_back(b1());
  v2.push_back(b2());
  v2.push_back(b3());
  for (vector<base>::iterator it = v2.begin();
	   it != v2.end(); it++) {
	cout << typeid(*it).name() << endl;
  }
}