#include <iostream>
#include <typeinfo>  //for 'typeid' to work
#include <typeindex>

using namespace std;

class Base {};

int main() {
  cout << typeid(Base).name() << endl; // 4Base
  cout << type_index(typeid(Base)).name() << endl; // 4Base
  cout << typeid(type_index(typeid(Base))).name() << endl; // NSt3__110type_indexE
  cout << type_index(typeid(type_index(typeid(Base)))).name() << endl; // NSt3__110type_indexE

  return 0;
}