System.Xml.Schema.BitSet.Clear C# (CSharp) Method

        public void Clear() {
            int bitsLength = bits.Length;
            for (int i = bitsLength; i-- > 0 ;) {
                bits[i] = 0;
            }
        }

        private BitSet[] CalculateTotalFollowposForRangeNodes(BitSet firstpos, BitSet[] followpos, out BitSet posWithRangeTerminals) {
            int positionsCount = positions.Count; //terminals
            posWithRangeTerminals = new BitSet(positionsCount);
            
            //Compute followpos for each range node
            //For any range node that is surrounded by an outer range node, its follow positions will include those of the outer range node
            BitSet[] minmaxFollowPos = new BitSet[minMaxNodesCount];
            int localMinMaxNodesCount = 0;
            
            for (int i = positionsCount - 1;  i >= 0; i--) { 
                Position p = positions[i];
                if (p.symbol == -2) { //P is a LeafRangeNode
                    LeafRangeNode lrNode = p.particle as LeafRangeNode;
                    Debug.Assert(lrNode != null);
                    BitSet tempFollowPos = new BitSet(positionsCount);
                    tempFollowPos.Clear();
                    tempFollowPos.Or(followpos[i]); //Add the followpos of the range node
                    if (lrNode.Min != lrNode.Max) { //If they are the same, then followpos cannot include the firstpos
                        tempFollowPos.Or(lrNode.NextIteration); //Add the nextIteration of the range node (this is the firstpos of its parent's leftChild)
                    }

                    //For each position in the bitset, if it is a outer range node (pos > i), then add its followpos as well to the current node's followpos
                    for (int pos = tempFollowPos.NextSet(-1); pos != -1; pos = tempFollowPos.NextSet(pos)) {
                        if (pos > i) {
                            Position p1 = positions[pos];
                            if (p1.symbol == -2) {
                                LeafRangeNode lrNode1 = p1.particle as LeafRangeNode;
                                Debug.Assert(lrNode1 != null);
                                tempFollowPos.Or(minmaxFollowPos[lrNode1.Pos]);
                            }
                        }
                    }
                    //set the followpos built to the index in the BitSet[]
                    minmaxFollowPos[localMinMaxNodesCount] = tempFollowPos; 
                    lrNode.Pos = localMinMaxNodesCount++; 
                    posWithRangeTerminals.Set(i);
                }
            }
            return minmaxFollowPos;
        }