private CombinedDoubleFacetIterator(int length)
 {
     m_queue = new DoubleFacetPriorityQueue();
     m_queue.Initialize(length);
 }
 private CombinedDoubleFacetIterator(int length)
 {
     _queue = new DoubleFacetPriorityQueue();
     _queue.Initialize(length);
 }