code: static DirectQuickSelectSketch fastWritableWrap(final WritableMemory srcMem, final long seed) {
      final int lgNomLongs = extractLgNomLongs(srcMem);                   //byte 3
      final int lgArrLongs = extractLgArrLongs(srcMem);                   //byte 4
  
      final DirectQuickSelectSketch dqss =
          new DirectQuickSelectSketch(seed, srcMem);
      dqss.hashTableThreshold_ = setHashTableThreshold(lgNomLongs, lgArrLongs);
      return dqss;
    }
docs: Fast-wrap a sketch around the given source Memory containing sketch data that originated from
  this sketch.  This does NO validity checking of the given Memory.
  @param srcMem <a href="{@docRoot}/resources/dictionary.html#mem">See Memory</a>
  The given Memory object must be in hash table form and not read only.
  @param seed <a href="{@docRoot}/resources/dictionary.html#seed">See Update Hash Seed</a>
  @return instance of this sketch