25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.8 Filter view [range.filter]

25.7.8.4 Class template filter_view​::​sentinel [range.filter.sentinel]

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namespace std::ranges { template<input_range V, indirect_unary_predicate<iterator_t<V>> Pred> requires view<V> && is_object_v<Pred> template<bool Const> class filter_view<V, Pred>::sentinel { private: using Base = maybe-const<Const, V>; // exposition only sentinel_t<Base> end_ = sentinel_t<Base>(); // exposition only constexpr explicit sentinel(Parent& parent); // exposition only public: sentinel() = default; constexpr sentinel(sentinel<!Const> other) requires Const && convertible_to<sentinel_t<V>, sentinel_t<Base>> constexpr sentinel_t<Base> base() const; template<bool OtherConst> requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>> friend constexpr bool operator==(const iterator<OtherConst>& x, const sentinel& y); }; }
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constexpr sentinel(sentinel<!Const> other) requires Const && convertible_to<sentinel_t<V>, sentinel_t<Base>>;
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Effects: Initializes end_ with std​::​move(other.end_).
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constexpr explicit sentinel(Parent& parent);
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Effects: Initializes end_ with ranges​::​end(parent.base_).
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constexpr sentinel_t<Base> base() const;
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Effects: Equivalent to: return end_;
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template<bool OtherConst> requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const <OtherConst, V>>> friend constexpr bool operator==(const iterator<OtherConst>& x, const sentinel& y);
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Effects: Equivalent to: return x.current_ == y.end_;