m_mask = static_cast<uint32_t> (atoi (++mask));

      uint32_t plen = static_cast<uint32_t> (atoi (++mask));

      NS_ASSERT (m_mask <= 32);

      NS_ASSERT (plen <= 32);

      if (plen > 0)

        {

          m_mask = 0xffffffff << (32 - plen);

        }

      else

        {

          m_mask = 0;

        }