Added default contructor for Block union

      this->byte[sizeof(Index) == 4 ? 7 : 15] = (uint8_t)type;

   }

   Block() = default;

   Index index[2]; // index[0] is row pointer, index[1] is index in warp

   uint8_t byte[sizeof(Index) == 4 ? 8 : 16]; // byte[7/15] is type specificator

};