code: public void swapLists() {
  		FastQueue<Helper> tmp = srcPositive;
  		srcPositive = dstPositive;
  		dstPositive = tmp;
  
  		tmp = srcNegative;
  		srcNegative = dstNegative;
  		dstNegative = tmp;
  	}
docs: Swaps the source and dest feature list.  Useful when processing a sequence
  of images and don't want to resort everything.