code: def GetVOffsetTSlot(self, slot, d):
          
  
          N.enforce_number(slot, N.VOffsetTFlags)
          N.enforce_number(d, N.VOffsetTFlags)
  
          off = self.Offset(slot)
          if off == 0:
                  return d
          return off
docs: GetVOffsetTSlot retrieves the VOffsetT that the given vtable location
          points to. If the vtable value is zero, the default value `d`
          will be returned.