18 template <class It>
21     It it_;
25     typedef typename std::iterator_traits<It>::value_type      value_type;
26     typedef typename std::iterator_traits<It>::difference_type difference_type;
27     typedef It                                                 pointer;
28     typedef typename std::iterator_traits<It>::reference       reference;
30     constexpr It base() const {return it_;}  in base()
33     explicit constexpr simple_iterator(It it) : it_(it) {}  in simple_iterator()
42 template <class It>
45     It it_;
49     typedef typename std::iterator_traits<It>::value_type      value_type;
50     typedef typename std::iterator_traits<It>::difference_type difference_type;
51     typedef It                                                 pointer;
52     typedef typename std::iterator_traits<It>::reference       reference;
54     constexpr It base() const {return it_;}  in base()
57     explicit constexpr value_iterator(It it) : it_(it) {}  in value_iterator()
66 template <class It>
69     It it_;
73     typedef typename std::iterator_traits<It>::value_type      value_type;
74     typedef typename std::iterator_traits<It>::difference_type difference_type;
75     typedef It                                                 pointer;
76     typedef typename std::iterator_traits<It>::reference       reference;
78     constexpr It base() const {return it_;}  in base()
81     explicit constexpr void_plus_plus_iterator(It it) : it_(it) {}  in void_plus_plus_iterator()
90 template <class It>
93     It it_;
105     typedef typename std::iterator_traits<It>::value_type      underlying_value_type;
107     typedef typename std::iterator_traits<It>::difference_type difference_type;
108     typedef It                                                 pointer;
109     typedef typename std::iterator_traits<It>::reference       reference;
111     constexpr It base() const {return it_;}  in base()
114     explicit constexpr value_type_not_move_constructible_iterator(It it) : it_(it) {}  in value_type_not_move_constructible_iterator()
122 template <class It>
125     It it_;
129     typedef typename std::iterator_traits<It>::value_type      value_type;
130     typedef typename std::iterator_traits<It>::difference_type difference_type;
131     typedef It                                                 pointer;
132     typedef typename std::iterator_traits<It>::reference       reference;
134     constexpr It base() const {return it_;}  in base()
137     explicit constexpr comparable_iterator(It it) : it_(it) {}  in comparable_iterator()
145 … friend constexpr bool operator==(const comparable_iterator& lhs, const simple_iterator<It>& rhs) {
148 … friend constexpr bool operator==(const simple_iterator<It>& lhs, const comparable_iterator& rhs) {
152 …  friend constexpr auto operator-(const comparable_iterator& lhs, const simple_iterator<It>& rhs) {
155 …  friend constexpr auto operator-(const simple_iterator<It>& lhs, const comparable_iterator& rhs) {
160 template <class It>
163     It it_;
167     typedef typename std::iterator_traits<It>::value_type      value_type;
168     typedef typename std::iterator_traits<It>::difference_type difference_type;
169     typedef It                                                 pointer;
170     typedef typename std::iterator_traits<It>::reference       reference;
172     constexpr It base() const {return it_;}  in base()
175     explicit constexpr convertible_iterator(It it) : it_(it) {}  in convertible_iterator()
183     operator forward_iterator<It>() const { return forward_iterator<It>(it_); }
186 template <class It>
189     It it_;
193     typedef typename std::iterator_traits<It>::value_type      value_type;
194     typedef typename std::iterator_traits<It>::difference_type difference_type;
195     typedef It                                                 pointer;
196     typedef typename std::iterator_traits<It>::reference       reference;
198     constexpr It base() const {return it_;}  in base()
201     explicit constexpr non_const_deref_iterator(It it) : it_(it) {}  in non_const_deref_iterator()
234 template <class It>
237     It it_;
241     typedef typename std::iterator_traits<It>::value_type      value_type;
242     typedef typename std::iterator_traits<It>::difference_type difference_type;
243     typedef It                                                 pointer;
244     typedef typename std::iterator_traits<It>::reference       reference;
246     constexpr It base() const {return it_;}  in base()
249     explicit constexpr assignable_iterator(It it) : it_(it) {}  in assignable_iterator()
251     assignable_iterator(const forward_iterator<It>& it) : it_(it.base()) {}  in assignable_iterator()
252     assignable_iterator(const sentinel_type<It>& it) : it_(it.base) {}  in assignable_iterator()
260     assignable_iterator& operator=(const forward_iterator<It> &other) {
265     assignable_iterator& operator=(const sentinel_type<It> &other) {
284 template <class It>
287     It it_;
291     typedef typename std::iterator_traits<It>::value_type      value_type;
292     typedef typename std::iterator_traits<It>::difference_type difference_type;
293     typedef It                                                 pointer;
294     typedef typename std::iterator_traits<It>::reference       reference;
296     constexpr It base() const {return it_;}  in base()
299     explicit constexpr maybe_valueless_iterator(It it) : it_(it) {}  in maybe_valueless_iterator()
301     maybe_valueless_iterator(const forward_iterator<It>& it) : it_(it.base()) {}  in maybe_valueless_iterator()
309     maybe_valueless_iterator& operator=(const forward_iterator<It> &other) {