25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.16 Lazy split view [range.lazy.split]

25.7.16.3 Class template lazy_split_view​::​outer-iterator [range.lazy.split.outer]

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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 lazy_split_view<V, Pattern>::outer-iterator { private: using Parent = maybe-const<Const, lazy_split_view>; // exposition only using Base = maybe-const<Const, V>; // exposition only Parent* parent_ = nullptr; // exposition only iterator_t<Base> current_ = iterator_t<Base>(); // exposition only, present only // if V models forward_range bool trailing_empty_ = false; // exposition only public: using iterator_concept = conditional_t<forward_range<Base>, forward_iterator_tag, input_iterator_tag>; using iterator_category = input_iterator_tag; // present only if Base // models forward_range // [range.lazy.split.outer.value], class lazy_split_view​::​outer-iterator​::​value_type struct value_type; using difference_type = range_difference_t<Base>; outer-iterator() = default; constexpr explicit outer-iterator(Parent& parent) requires (!forward_range<Base>); constexpr outer-iterator(Parent& parent, iterator_t<Base> current) requires forward_range<Base>; constexpr outer-iterator(outer-iterator<!Const> i) requires Const && convertible_to<iterator_t<V>, iterator_t<Base>>; constexpr value_type operator*() const; constexpr outer-iterator& operator++(); constexpr decltype(auto) operator++(int) { if constexpr (forward_range<Base>) { auto tmp = *this; ++*this; return tmp; } else ++*this; } friend constexpr bool operator==(const outer-iterator& x, const outer-iterator& y) requires forward_range<Base>; friend constexpr bool operator==(const outer-iterator& x, default_sentinel_t); }; }
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Many of the specifications in [range.lazy.split] refer to the notional member current of outer-iterator.
current is equivalent to current_ if V models forward_range, and *parent_->current_ otherwise.
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constexpr explicit outer-iterator(Parent& parent) requires (!forward_range<Base>);
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Effects: Initializes parent_ with addressof(parent).
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constexpr outer-iterator(Parent& parent, iterator_t<Base> current) requires forward_range<Base>;
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Effects: Initializes parent_ with addressof(parent) and current_ with std​::​move(current).
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constexpr outer-iterator(outer-iterator<!Const> i) requires Const && convertible_to<iterator_t<V>, iterator_t<Base>>;
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Effects: Initializes parent_ with i.parent_, current_ with std​::​move(i.current_), and trailing_empty_ with i.trailing_empty_.
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constexpr value_type operator*() const;
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Effects: Equivalent to: return value_type{*this};
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constexpr outer-iterator& operator++();
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Effects: Equivalent to: const auto end = ranges::end(parent_->base_); if (current == end) { trailing_empty_ = false; return *this; } const auto [pbegin, pend] = subrange{parent_->pattern_}; if (pbegin == pend) ++current; else if constexpr (tiny-range<Pattern>) { current = ranges::find(std::move(current), end, *pbegin); if (current != end) { ++current; if (current == end) trailing_empty_ = true; } } else { do { auto [b, p] = ranges::mismatch(current, end, pbegin, pend); if (p == pend) { current = b; if (current == end) trailing_empty_ = true; break; // The pattern matched; skip it } } while (++current != end); } return *this;
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friend constexpr bool operator==(const outer-iterator& x, const outer-iterator& y) requires forward_range<Base>;
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Effects: Equivalent to: return x.current_ == y.current_ && x.trailing_empty_ == y.trailing_empty_;
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friend constexpr bool operator==(const outer-iterator& x, default_sentinel_t);
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Effects: Equivalent to: return x.current == ranges::end(x.parent_->base_) && !x.trailing_empty_;