S next = old.finishReading(); --_usedSegmentsCount; _tail = next.initForReading();
S next = old.finishReading(); --_usedSegmentsCount; _tail = next.initForReading();
S next = old.finishReading(); --_usedSegmentsCount; _tail = next.initForReading();
S next = old.finishReading(); --_usedSegmentsCount; _tail = next.initForReading();