24 Ranges library [ranges]

24.7 Range adaptors [range.adaptors]

24.7.11 Join view [range.join]

24.7.11.4 Class template join_­view​::​sentinel [range.join.sentinel]

namespace std::ranges { template<input_­range V> requires view<V> && input_­range<range_reference_t<V>> && (is_reference_v<range_reference_t<V>> || view<range_value_t<V>>) template<bool Const> struct join_view<V>::sentinel { private: using Parent = // exposition only conditional_t<Const, const join_view, join_view>; using Base = conditional_t<Const, const V, V>; // exposition only sentinel_t<Base> end_ = sentinel_t<Base>(); // exposition only public: sentinel() = default; constexpr explicit sentinel(Parent& parent); constexpr sentinel(sentinel<!Const> s) requires Const && convertible_­to<sentinel_t<V>, sentinel_t<Base>>; friend constexpr bool operator==(const iterator<Const>& x, const sentinel& y); }; }
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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(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_­).
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friend constexpr bool operator==(const iterator<Const>& x, const sentinel& y);
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Effects: Equivalent to: return x.outer_­ == y.end_­;