sclass G22FindSimilarMasksTask<A> {
  // Image we are looking up
  settable Image2B queryImage;
  
  // optional - which primary mask holder is tasked with the search
  settable IG22MasksHolder mainMasksHolder;
  
  // where the found masks go (probability = similarity)
  settable new ProbabilisticList<FoundMask> outList;
  
  // probabilistic stack & scheduler
  settable new PStack pstack;
  
  // how many full mask comparisons were made
  int comparisons;
  
  class FoundMask {
    settable IG22Mask<A> mask;
    settable double similarity;
    settable int candidateNumber;
    settable long stepCount;
  }
  
  IProbabilisticScheduler scheduler() { ret pstack.scheduler(); }
  
  void foundMask(IG22Mask<A> mask, double similarity) {
    long stepCount = scheduler().stepCount();
    print("Found mask with similarity " + formatDouble3X(similarity) + " in step " + stepCount);
    outList.at(similarity,
      new FoundMask().+mask.+similarity
        .candidateNumber(comparisons).+stepCount);
  }
}