43   typedef const MutableVal *const_iterator;  typedef
44   const_iterator begin() const;
45   const_iterator end() const;
46   const_iterator cbegin() const;
47   const_iterator cend() const;
52 S::const_iterator begin(const S&);
53 S::const_iterator end(const S&);
54 S::const_iterator cbegin(const S&);
55 S::const_iterator cend(const S&);
83   struct const_iterator {  struct
86     const_iterator &operator++();
87     bool operator!=(const const_iterator &other);
92     operator const_iterator() const;
137   typedef iterator_base const_iterator;  typedef
138   const_iterator begin() const;
139   const_iterator end() const;
191   typedef iterator_base const_iterator;  typedef
192   const_iterator begin() const;
193   const_iterator end() const;
209   typedef const IteratorType* const_iterator;  typedef
214   const_iterator begin() const;
215   const_iterator end() const;