24 Ranges library [ranges]

24.7 Range adaptors [range.adaptors]

24.7.12 Split view [range.split]

24.7.12.5 Class template split_­view​::​inner-iterator [range.split.inner]

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namespace std::ranges { template<input_­range V, forward_­range Pattern> requires view<V> && view<Pattern> && indirectly_­comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> && (forward_­range<V> || tiny-range<Pattern>) template<bool Const> struct split_view<V, Pattern>::inner-iterator { private: using Base = maybe-const<Const, V>; // exposition only outer-iterator<Const> i_ = outer-iterator<Const>(); // exposition only bool incremented_ = false; // exposition only public: using iterator_concept = typename outer-iterator<Const>::iterator_concept; using iterator_category = see below; using value_type = range_value_t<Base>; using difference_type = range_difference_t<Base>; inner-iterator() = default; constexpr explicit inner-iterator(outer-iterator<Const> i); constexpr decltype(auto) operator*() const { return *i_.current; } constexpr inner-iterator& operator++(); constexpr decltype(auto) operator++(int) { if constexpr (forward_­range<V>) { auto tmp = *this; ++*this; return tmp; } else ++*this; } friend constexpr bool operator==(const inner-iterator& x, const inner-iterator& y) requires forward_­range<Base>; friend constexpr bool operator==(const inner-iterator& x, default_sentinel_t); friend constexpr decltype(auto) iter_move(const inner-iterator& i) noexcept(noexcept(ranges::iter_move(i.i_.current))) { return ranges::iter_move(i.i_.current); } friend constexpr void iter_swap(const inner-iterator& x, const inner-iterator& y) noexcept(noexcept(ranges::iter_swap(x.i_.current, y.i_.current))) requires indirectly_­swappable<iterator_t<Base>>; }; }
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The typedef-name iterator_­category denotes:
  • (1.1)
    forward_­iterator_­tag if iterator_­traits<iterator_­t<Base>>​::​iterator_­category models
    derived_­from<forward_­iterator_­tag>;
  • (1.2)
    otherwise, iterator_­traits<iterator_­t<Base>>​::​iterator_­category.
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constexpr explicit inner-iterator(outer-iterator<Const> i);
2
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Effects: Initializes i_­ with std​::​move(i).
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constexpr inner-iterator& operator++();
3
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Effects: Equivalent to: incremented_ = true; if constexpr (!forward_­range<Base>) { if constexpr (Pattern::size() == 0) { return *this; } } ++i_.current; return *this;
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friend constexpr bool operator==(const inner-iterator& x, const inner-iterator& y) requires forward_­range<Base>;
4
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Effects: Equivalent to: return x.i_­.current == y.i_­.current;
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friend constexpr bool operator==(const inner-iterator& x, default_sentinel_t);
5
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Effects: Equivalent to: auto [pcur, pend] = subrange{x.i_.parent_->pattern_}; auto end = ranges::end(x.i_.parent_->base_); if constexpr (tiny-range<Pattern>) { const auto & cur = x.i_.current; if (cur == end) return true; if (pcur == pend) return x.incremented_; return *cur == *pcur; } else { auto cur = x.i_.current; if (cur == end) return true; if (pcur == pend) return x.incremented_; do { if (*cur != *pcur) return false; if (++pcur == pend) return true; } while (++cur != end); return false; }
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friend constexpr void iter_swap(const inner-iterator& x, const inner-iterator& y) noexcept(noexcept(ranges::iter_swap(x.i_­.current, y.i_­.current))) requires indirectly_­swappable<iterator_t<Base>>;
6
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Effects: Equivalent to ranges​::​iter_­swap(x.i_­.current, y.i_­.current).