template <typename ElemType> class ForwardList
{
public:
  explicit ForwardList(int numElems = 0, const ElemType& defaultValue = ElemType());
  template <typename InputIterator>
  ForwardList(InputIterator begin, InputIterator end);
  ~ForwardList();

  ForwardList(const ForwardList& other);
  ForwardList& operator =(const ForwardList& other);

  ForwardList(ForwardList&& other);
  ForwardList& operator =(ForwardList&& other);

  typedef something-implementation-specific iterator;
  typedef something-implementation-specific const_iterator;

  iterator begin();
  iterator end();

  const_iterator cbegin() const;
  const_iterator cend() const;

  void push_front(const ElemType& value);
  void pop_front();
  ElemType& front();
  const ElemType& front() const;

  bool empty() const;
  int size() const;

private:
  /* ... implementation details ... */
};