// remove : voidfunc(K)
static <K> LinkedHashMap<K, Long> expiringHelperMap(final int timeOut, fO remove) {
  ret new LinkedHashMap<K, Long>() {
    protected bool removeEldestEntry(Map.Entry<K, Long> eldest) {
      long time = now();
      if (time - eldest.getValue() > timeOut) {
        Iterator<Map.Entry<K, Long>> i = entrySet().iterator();
        Map.Entry<K, Long> e = i.next();
        do {
            i.remove();
            pcallF(remove, e.getKey());
        } while (i.hasNext() && time - (e = i.next()).getValue() > timeOut);
      }
      false;
    }
  };
}