38 class HashSetIterator : std::iterator<std::forward_iterator_tag, Elem> {
40   HashSetIterator(const HashSetIterator&) = default;
41   HashSetIterator(HashSetIterator&&) = default;
42   HashSetIterator(HashSetType* hash_set, size_t index) : index_(index), hash_set_(hash_set) {}  in HashSetIterator()  function
50   HashSetIterator(const HashSetIterator<OtherElem, OtherHashSetType>& other)  in HashSetIterator()  function
53   HashSetIterator& operator=(const HashSetIterator&) = default;
54   HashSetIterator& operator=(HashSetIterator&&) = default;
56   bool operator==(const HashSetIterator& other) const {
60   bool operator!=(const HashSetIterator& other) const {
64   HashSetIterator operator++() {  // Value after modification.
69   HashSetIterator operator++(int) {
70     HashSetIterator temp = *this;
89   friend bool operator==(const HashSetIterator<Elem1, HashSetType1>& lhs,
90                          const HashSetIterator<Elem2, HashSetType2>& rhs);
92   template <class OtherElem, class OtherHashSetType> friend class HashSetIterator;  variable
96 bool operator==(const HashSetIterator<Elem1, HashSetType1>& lhs,
97                 const HashSetIterator<Elem2, HashSetType2>& rhs) {
99       std::is_convertible<HashSetIterator<Elem1, HashSetType1>,
100                           HashSetIterator<Elem2, HashSetType2>>::value ||
101       std::is_convertible<HashSetIterator<Elem2, HashSetType2>,
102                           HashSetIterator<Elem1, HashSetType1>>::value, "Bad iterator types.");
108 bool operator!=(const HashSetIterator<Elem1, HashSetType1>& lhs,
109                 const HashSetIterator<Elem2, HashSetType2>& rhs) {
173   using iterator = HashSetIterator<T, HashSet>;
174   using const_iterator = HashSetIterator<const T, const HashSet>;
747   friend class HashSetIterator;  variable