namespace std::ranges { template<class W, class Bound> struct iota_view<W, Bound>::iterator { private: W value_ = W(); // exposition only public: using iterator_category = see below; using value_type = W; using difference_type = IOTA-DIFF-T(W); iterator() = default; constexpr explicit iterator(W value); constexpr W operator*() const noexcept(is_nothrow_copy_constructible_v<W>); constexpr iterator& operator++(); constexpr void operator++(int); constexpr iterator operator++(int) requires incrementable<W>; constexpr iterator& operator--() requires decrementable<W>; constexpr iterator operator--(int) requires decrementable<W>; constexpr iterator& operator+=(difference_type n) requires advanceable<W>; constexpr iterator& operator-=(difference_type n) requires advanceable<W>; constexpr W operator[](difference_type n) const requires advanceable<W>; friend constexpr bool operator==(const iterator& x, const iterator& y) requires equality_comparable<W>; friend constexpr bool operator<(const iterator& x, const iterator& y) requires totally_ordered<W>; friend constexpr bool operator>(const iterator& x, const iterator& y) requires totally_ordered<W>; friend constexpr bool operator<=(const iterator& x, const iterator& y) requires totally_ordered<W>; friend constexpr bool operator>=(const iterator& x, const iterator& y) requires totally_ordered<W>; friend constexpr compare_three_way_result_t<W> operator<=>( const iterator& x, const iterator& y) requires totally_ordered<W> && three_way_comparable<W>; friend constexpr iterator operator+(iterator i, difference_type n) requires advanceable<W>; friend constexpr iterator operator+(difference_type n, iterator i) requires advanceable<W>; friend constexpr iterator operator-(iterator i, difference_type n) requires advanceable<W>; friend constexpr difference_type operator-(const iterator& x, const iterator& y) requires advanceable<W>; }; }
constexpr explicit iterator(W value);
constexpr W operator*() const noexcept(is_nothrow_copy_constructible_v<W>);
constexpr iterator& operator++();
constexpr void operator++(int);
constexpr iterator operator++(int) requires incrementable<W>;
friend constexpr bool operator==(const iterator& x, const iterator& y)
requires equality_comparable<W>;
friend constexpr bool operator<(const iterator& x, const iterator& y)
requires totally_ordered<W>;
friend constexpr bool operator>(const iterator& x, const iterator& y)
requires totally_ordered<W>;
friend constexpr bool operator<=(const iterator& x, const iterator& y)
requires totally_ordered<W>;
friend constexpr bool operator>=(const iterator& x, const iterator& y)
requires totally_ordered<W>;
friend constexpr compare_three_way_result_t<W>
operator<=>(const iterator& x, const iterator& y)
requires totally_ordered<W> && three_way_comparable<W>;