Lucene.Net.Util.FixedBitSet.FixedBitSetIterator.NextDoc C# (CSharp) Метод

            public override int NextDoc()
            {
                if (Doc == NO_MORE_DOCS || ++Doc >= NumBits)
                {
                    return Doc = NO_MORE_DOCS;
                }
                int i = Doc >> 6;
                int subIndex = Doc & 0x3f; // index within the word
                long word = bits[i] >> subIndex; // skip all the bits to the right of index

                if (word != 0)
                {
                    return Doc = Doc + Number.NumberOfTrailingZeros(word);
                }

                while (++i < NumWords)
                {
                    word = bits[i];
                    if (word != 0)
                    {
                        return Doc = (i << 6) + Number.NumberOfTrailingZeros(word);
                    }
                }

                return Doc = NO_MORE_DOCS;
            }