natix.CompactDS.SeqXLB.Select C# (CSharp) Method

        public int Select(int symbol, int _rank)
        {
            if (_rank < 1) {
                return -1;
            }
            if (symbol == 0) {
                return (int)this.xl_bitmap.Select1 (_rank);
            }
            long pos = symbol * ((long)this.Count);
            var rank = this.xl_bitmap.Rank1 (pos - 1);
            var p = this.xl_bitmap.Select1 (rank + _rank) - pos;
            return (int)p;
        }