24 Ranges library [ranges]

24.7 Range adaptors [range.adaptors]

24.7.12 Join view [range.join]

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

namespace std::ranges { template<input_­range V> requires view<V> && input_­range<range_reference_t<V>> template<bool Const> struct join_view<V>::sentinel { private: using Parent = maybe-const<Const, join_view>; // exposition only using Base = maybe-const<Const, 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>>; 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); }; }
constexpr explicit sentinel(Parent& parent);
Effects: Initializes end_­ with ranges​::​end(parent.base_­).
constexpr sentinel(sentinel<!Const> s) requires Const && convertible_­to<sentinel_t<V>, sentinel_t<Base>>;
Effects: Initializes end_­ with std​::​move(s.end_­).
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);
Effects: Equivalent to: return x.outer_­ == y.end_­;