25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.21 Reverse view [range.reverse]

25.7.21.2 Class template reverse_view [range.reverse.view]

namespace std::ranges { template<view V> requires bidirectional_range<V> class reverse_view : public view_interface<reverse_view<V>> { private: V base_ = V(); // exposition only public: reverse_view() requires default_initializable<V> = default; constexpr explicit reverse_view(V r); constexpr V base() const & requires copy_constructible<V> { return base_; } constexpr V base() && { return std::move(base_); } constexpr reverse_iterator<iterator_t<V>> begin(); constexpr reverse_iterator<iterator_t<V>> begin() requires common_range<V>; constexpr auto begin() const requires common_range<const V>; constexpr reverse_iterator<iterator_t<V>> end(); constexpr auto end() const requires common_range<const V>; constexpr auto size() requires sized_range<V> { return ranges::size(base_); } constexpr auto size() const requires sized_range<const V> { return ranges::size(base_); } }; template<class R> reverse_view(R&&) -> reverse_view<views::all_t<R>>; }

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constexpr explicit reverse_view(V base);

Effects: Initializes base_ with std::move(base).

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constexpr reverse_iterator<iterator_t<V>> begin();

Returns: make_reverse_iterator(ranges::next(ranges::begin(base_), ranges::end(base_)))

Remarks: In order to provide the amortized constant time complexity required by the range concept, this function caches the result within the reverse_view for use on subsequent calls.

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constexpr reverse_iterator<iterator_t<V>> begin() requires common_range<V>;
constexpr auto begin() const requires common_range<const V>;

Effects: Equivalent to: return make_reverse_iterator(ranges::end(base_));

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constexpr reverse_iterator<iterator_t<V>> end();
constexpr auto end() const requires common_range<const V>;

Effects: Equivalent to: return make_reverse_iterator(ranges::begin(base_));