Typeid not functioning correctly

Question

I cannot get typeid function correctly. Am I missing something

Code:

class A
{
     public:
     int a1;
     A()
    {
    }
};


class B: public A
{
    public:
    int b1;
    B()
    {
    }
};


int main()
{
     B tempb;
     A tempa;
     A * ptempa;
     ptempa = &tempb;

     std::cout << typeid(tempb).name() << std::endl;
     std::cout << typeid(tempa).name() << std::endl;
     std::cout << typeid(*ptempa).name() << std::endl;

     return 0;
}

It always prints:

Class B Class A Class A

I am using VS2010 for my project

Answer 1

The problem is that A has no virtual functions, so is not treated as a polymorphic type. As a result, typeid looks up the declared type of the pointer, not the actual type of the object that it points to.