CBase::CBase()
{
  // returns ptr to classCBase.
  CRuntimeClass *prc = GetRuntimeClass();
}
So once again, the only way to get the derived class's runtime class from within the base class is to pass it.
class CBase : public CObject {
{
  CBase(CRuntimeClass* pDerivedClass, ...);
  •••
 }
CDerived1::CDerived1(...) : 
  CBase(RUNTIME_CLASS(CDerived1),...)
{
  •••
}