Method NextRun

cpp/src/arrow/util/bit_run_reader.h:61–69

      : reader_(bitmap, start_offset, length) {}

  BitRun NextRun() {
    BitRun rl = {/*length=*/0, reader_.IsSet()};
    // Advance while the values are equal and not at the end of list.
    while (reader_.position() < reader_.length() && reader_.IsSet() == rl.set) {
      rl.length++;
      reader_.Next();
    }
    return rl;
  }

 private:
  BitmapReader reader_;