TPZAutoPointer<T> missing equality comparison operator

[orlandini]

Codes such as

T *a, *b;
//code
TPZAutoPointer<T> ptr1(a);
TPZAutoPointer<T> ptr2(b);
if(ptr1 == ptr2){
  //do something
}

won't work as expected.
Both ptr1 and ptr2 will be converted to bool and evaluate to true as long as a and b are non null, therefore we are not testing if they point to the same reference.