492 using NodeIter = std::vector<NodeT *>::const_iterator;  typedef
498   MergedNodesT(NodeIter Begin1, NodeIter End1,  in MergedNodesT()
499                NodeIter Begin2 = EmptyList.begin(),  in MergedNodesT()
500                NodeIter End2 = EmptyList.end(),  in MergedNodesT()
501                NodeIter Begin3 = EmptyList.begin(),  in MergedNodesT()
502                NodeIter End3 = EmptyList.end())  in MergedNodesT()
528   NodeIter Begin1;
529   NodeIter End1;
530   NodeIter Begin2;
531   NodeIter End2;
532   NodeIter Begin3;
533   NodeIter End3;
565   NodeIter BeginX1 = X.begin();  in mergeNodes()
566   NodeIter EndX1 = X.begin() + MergeOffset;  in mergeNodes()
567   NodeIter BeginX2 = X.begin() + MergeOffset;  in mergeNodes()
568   NodeIter EndX2 = X.end();  in mergeNodes()
569   NodeIter BeginY = Y.begin();  in mergeNodes()
570   NodeIter EndY = Y.end();  in mergeNodes()