const_iterator w(const size_t *a) const { return const_iterator{table, a}; }

///////////////////////////////////////////////////////
 template <typename Key, size_t N>
class ADS_set<Key,N>::Iterator {
public:
  using value_type = Key;
  using difference_type = std::ptrdiff_t;
  using reference = const value_type &;
  using pointer = const value_type *;
  using iterator_category = std::forward_iterator_tag;

private:
  element *pos;
	const size_t *a;
	size_t n;
  void skip() { while (pos->mode != Mode::used && pos->mode != Mode::end) ++pos; }

public:
  //explicit Iterator(element *pos = nullptr): pos{pos} { if (pos) skip(); }
	explicit Iterator(element *pos = nullptr, const size_t *a = nullptr): pos{pos}, a{a}, n{1}{ if (pos) skip(); }
  reference operator*() const { return pos->key; }
  pointer operator->() const { return &pos->key; }

  Iterator &operator++() {
   if (a) {
    if (n < *a) { ++n;  return *this; }
    else { n = 1;  ++a;}
  }
		++pos; skip(); return *this;
	}

  Iterator operator++(int) { auto rc {*this}; ++*this; return rc; }
  friend bool operator==(const Iterator &lhs, const Iterator &rhs) { return lhs.pos == rhs.pos; }
  friend bool operator!=(const Iterator &lhs, const Iterator &rhs) { return !(lhs == rhs); }
};



//////////////////////////////////////////////////////    const_iterator w(const size_t *a) const   24.09.2019  ne znam ga pozvati

	/*  ADS_set<int, 7> h{5,1,7,3,4};
    h.dump();
    size_t a[5] = {1,2,3,1,2};
    auto iter = h.w(a);
    while (iter != h.end()) {
        std::cout << "iter: " << *iter << std::endl;
        ++iter;
    }  */