sclass mapI_It extends IterableIterator {
  O f;
  Iterator i;
  
  *() {}
  *(O *f, Iterator *i) {}
  
  public bool hasNext() {
    ret i.hasNext();
  }
  
  public O next() {
    ret callF(f, i.next());
  }
  
  toString {
    ret formatFunctionCall('mapI, f, i);
  }
}


// apply a function to an iterator
static IterableIterator mapLike mapI(final O f, final Iterator i) {
  ret mapI_It(f, i);
}

ifclass IterableIterator
static IterableIterator mapI(IterableIterator i, O f) {
  ret mapI((Iterator) i, f);
}

static IterableIterator mapI(O f, IterableIterator i) {
  ret mapI((Iterator) i, f);
}
endif

static IterableIterator mapI(Iterator i, O f) {
  ret mapI(f, i);
}

static <A, B> ItIt<B> mapI(Iterable<A> i, IF1<A, B> f) {
  ret mapI(i, (O) f);
}

static IterableIterator mapI(Iterable i, O f) {
  ret mapI(f, i.iterator());
}

static IterableIterator mapI(O f, Iterable i) {
  ret mapI(i, f);
}