153     size_t idx = 0;  in GetBitLengthTotalAtPosition()  local
155     while (idx < position && idx < kCapacity) {  in GetBitLengthTotalAtPosition()
156       sum += kBitSizeAtPosition[idx];  in GetBitLengthTotalAtPosition()
157       ++idx;  in GetBitLengthTotalAtPosition()
182   BitStringChar operator[](size_t idx) const {
183     DCHECK_LT(idx, kCapacity);
185     StorageType data = BitFieldExtract(storage_, GetLsbForPosition(idx), kBitSizeAtPosition[idx]);
187     return BitStringChar(data, kBitSizeAtPosition[idx]);
193   void SetAt(size_t idx, BitStringChar bitchar) {  in SetAt()
194     DCHECK_LT(idx, kCapacity);  in SetAt()
195     DCHECK_LE(bitchar.GetBitLength(), kBitSizeAtPosition[idx]);  in SetAt()
200                               GetLsbForPosition(idx),  in SetAt()
201                               kBitSizeAtPosition[idx]);  in SetAt()