25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.30 Slide view [range.slide]

25.7.30.3 Class template slide_view::iterator [range.slide.iterator]

namespace std::ranges { template<forward_range V> requires view<V> template<bool Const> class slide_view<V>::iterator { using Base = maybe-const<Const, V>; // exposition only iterator_t<Base> current_ = iterator_t<Base>(); // exposition only iterator_t<Base> last_ele_ = iterator_t<Base>(); // exposition only, // present only if Base models slide-caches-first range_difference_t<Base> n_ = 0; // exposition only constexpr iterator(iterator_t<Base> current, range_difference_t<Base> n) // exposition only requires (!slide-caches-first<Base>); constexpr iterator(iterator_t<Base> current, iterator_t<Base> last_ele, // exposition only range_difference_t<Base> n) requires slide-caches-first<Base>; public: using iterator_category = input_iterator_tag; using iterator_concept = see below; using value_type = decltype(views::counted(current_, n_)); using difference_type = range_difference_t<Base>; iterator() = default; constexpr iterator(iterator<!Const> i) requires Const && convertible_to<iterator_t<V>, iterator_t<Base>>; constexpr auto operator*() const; constexpr iterator& operator++(); constexpr iterator operator++(int); constexpr iterator& operator--() requires bidirectional_range<Base>; constexpr iterator operator--(int) requires bidirectional_range<Base>; constexpr iterator& operator+=(difference_type x) requires random_access_range<Base>; constexpr iterator& operator-=(difference_type x) requires random_access_range<Base>; constexpr auto operator[](difference_type n) const requires random_access_range<Base>; friend constexpr bool operator==(const iterator& x, const iterator& y); friend constexpr bool operator<(const iterator& x, const iterator& y) requires random_access_range<Base>; friend constexpr bool operator>(const iterator& x, const iterator& y) requires random_access_range<Base>; friend constexpr bool operator<=(const iterator& x, const iterator& y) requires random_access_range<Base>; friend constexpr bool operator>=(const iterator& x, const iterator& y) requires random_access_range<Base>; friend constexpr auto operator<=>(const iterator& x, const iterator& y) requires random_access_range<Base> && three_way_comparable<iterator_t<Base>>; friend constexpr iterator operator+(const iterator& i, difference_type n) requires random_access_range<Base>; friend constexpr iterator operator+(difference_type n, const iterator& i) requires random_access_range<Base>; friend constexpr iterator operator-(const iterator& i, difference_type n) requires random_access_range<Base>; friend constexpr difference_type operator-(const iterator& x, const iterator& y) requires sized_sentinel_for<iterator_t<Base>, iterator_t<Base>>; }; }

iterator::iterator_concept is defined as follows:

(1.1)
If Base models random_access_range, then iterator_concept denotes random_access_iterator_tag.
(1.2)
Otherwise, if Base models bidirectional_range, then iterator_concept denotes bidirectional_iterator_tag.
(1.3)
Otherwise, iterator_concept denotes forward_iterator_tag.

If the invocation of any non-const member function of iterator exits via an exception, the iterator acquires a singular value.

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constexpr iterator(iterator_t<Base> current, range_difference_t<Base> n)
  requires (!slide-caches-first<Base>);

Effects: Initializes current_ with current and n_ with n.

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constexpr iterator(iterator_t<Base> current, iterator_t<Base> last_ele,
                   range_difference_t<Base> n)
  requires slide-caches-first<Base>;

Effects: Initializes current_ with current, last_ele_ with last_ele, and n_ with n.

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constexpr iterator(iterator<!Const> i)
  requires Const && convertible_to<iterator_t<V>, iterator_t<Base>>;

Effects: Initializes current_ with std::move(i.current_) and n_ with i.n_.

[Note 1:

iterator<true> can only be formed when Base models slide-caches-nothing, in which case last_ele_ is not present.

— end note]

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constexpr auto operator*() const;

Returns: views::counted(current_, n_).

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constexpr iterator& operator++();

Preconditions: current_ and last_ele_ (if present) are incrementable.

Postconditions: current_ and last_ele_ (if present) are each equal to ranges::next(i), where i is the value of that data member before the call.

Returns: *this.

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constexpr iterator operator++(int);

Effects: Equivalent to: auto tmp = *this; ++*this; return tmp;

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constexpr iterator& operator--() requires bidirectional_range<Base>;

Preconditions: current_ and last_ele_ (if present) are decrementable.

Postconditions: current_ and last_ele_ (if present) are each equal to ranges::prev(i), where i is the value of that data member before the call.

Returns: *this.

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constexpr iterator operator--(int) requires bidirectional_range<Base>;

Effects: Equivalent to: auto tmp = *this; --*this; return tmp;

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constexpr iterator& operator+=(difference_type x)
  requires random_access_range<Base>;

Preconditions: current_ + x and last_ele_ + x (if last_ele_ is present) have well-defined behavior.

Postconditions: current_ and last_ele_ (if present) are each equal to i + x, where i is the value of that data member before the call.

Returns: *this.

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constexpr iterator& operator-=(difference_type x)
  requires random_access_range<Base>;

Preconditions: current_ - x and last_ele_ - x (if last_ele_ is present) have well-defined behavior.

Postconditions: current_ and last_ele_ (if present) are each equal to i - x, where i is the value of that data member before the call.

Returns: *this.

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constexpr auto operator[](difference_type n) const
  requires random_access_range<Base>;

Effects: Equivalent to: return views::counted(current_ + n, n_);

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friend constexpr bool operator==(const iterator& x, const iterator& y);

Returns: If last_ele_ is present, x.last_ele_ == y.last_ele_; otherwise, x.current_ == y.current_.

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friend constexpr bool operator<(const iterator& x, const iterator& y)
  requires random_access_range<Base>;

Returns: x.current_ < y.current_.

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friend constexpr bool operator>(const iterator& x, const iterator& y)
  requires random_access_range<Base>;

Effects: Equivalent to: return y < x;

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friend constexpr bool operator<=(const iterator& x, const iterator& y)
  requires random_access_range<Base>;

Effects: Equivalent to: return !(y < x);

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friend constexpr bool operator>=(const iterator& x, const iterator& y)
  requires random_access_range<Base>;

Effects: Equivalent to: return !(x < y);

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friend constexpr auto operator<=>(const iterator& x, const iterator& y)
  requires random_access_range<Base> &&
           three_way_comparable<iterator_t<Base>>;

Returns: x.current_ <=> y.current_.

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friend constexpr iterator operator+(const iterator& i, difference_type n)
  requires random_access_range<Base>;
friend constexpr iterator operator+(difference_type n, const iterator& i)
  requires random_access_range<Base>;

Effects: Equivalent to: auto r = i; r += n; return r;

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friend constexpr iterator operator-(const iterator& i, difference_type n)
  requires random_access_range<Base>;

Effects: Equivalent to: auto r = i; r -= n; return r;

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friend constexpr difference_type operator-(const iterator& x, const iterator& y)
  requires sized_sentinel_for<iterator_t<Base>, iterator_t<Base>>;

Returns: If last_ele_ is present, x.last_ele_ - y.last_ele_; otherwise, x.current_ - y.current_.

25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.30 Slide view [range.slide]

25.7.30.3 Class template slide_view​::​iterator [range.slide.iterator]

25.7.30.3 Class template slide_view::iterator [range.slide.iterator]