25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.11 Take while view [range.take.while]

25.7.11.3 Class template take_while_view​::​sentinel [range.take.while.sentinel]

namespace std::ranges { template<view V, class Pred> requires input_range<V> && is_object_v<Pred> && indirect_unary_predicate<const Pred, iterator_t<V>> template<bool Const> class take_while_view<V, Pred>::sentinel { using Base = maybe-const<Const, V>; // exposition only sentinel_t<Base> end_ = sentinel_t<Base>(); // exposition only const Pred* pred_ = nullptr; // exposition only public: sentinel() = default; constexpr explicit sentinel(sentinel_t<Base> end, const Pred* pred); constexpr sentinel(sentinel<!Const> s) requires Const && convertible_to<sentinel_t<V>, sentinel_t<Base>>; constexpr sentinel_t<Base> base() const { return end_; } friend constexpr bool operator==(const iterator_t<Base>& x, const sentinel& y); template<bool OtherConst = !Const> requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>> friend constexpr bool operator==(const iterator_t<maybe-const<OtherConst, V>>& x, const sentinel& y); }; }
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constexpr explicit sentinel(sentinel_t<Base> end, const Pred* pred);
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Effects: Initializes end_ with end and pred_ with pred.
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constexpr sentinel(sentinel<!Const> s) requires Const && convertible_to<sentinel_t<V>, sentinel_t<Base>>;
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Effects: Initializes end_ with std​::​move(s.end_) and pred_ with s.pred_.
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friend constexpr bool operator==(const iterator_t<Base>& x, const sentinel& y); template<bool OtherConst = !Const> requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>> friend constexpr bool operator==(const iterator_t<maybe-const<OtherConst, V>>& x, const sentinel& y);
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Effects: Equivalent to: return y.end_ == x || !invoke(*y.pred_, *x);