25 Iterators library [iterators]

25.5 Iterator adaptors [predef.iterators]

25.5.5 Common iterators [iterators.common]

25.5.5.4 Accessors [common.iter.access]

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constexpr decltype(auto) operator*(); constexpr decltype(auto) operator*() const requires dereferenceable<const I>;
1
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Preconditions: holds_alternative<I>(v_) is true.
2
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Effects: Equivalent to: return *get<I>(v_);
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constexpr auto operator->() const requires see below;
3
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The expression in the requires-clause is equivalent to: indirectly_readable<const I> && (requires(const I& i) { i.operator->(); } || is_reference_v<iter_reference_t<I>> || constructible_from<iter_value_t<I>, iter_reference_t<I>>)
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Preconditions: holds_alternative<I>(v_) is true.
5
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Effects:
  • (5.1)
    If I is a pointer type or if the expression get<I>(v_).operator->() is well-formed, equivalent to: return get<I>(v_);
  • (5.2)
    Otherwise, if iter_reference_t<I> is a reference type, equivalent to: auto&& tmp = *get<I>(v_); return addressof(tmp);
  • (5.3)
    Otherwise, equivalent to: return proxy(*get<I>(v_)); where proxy is the exposition-only class: class proxy { iter_value_t<I> keep_; constexpr proxy(iter_reference_t<I>&& x) : keep_(std::move(x)) {} public: constexpr const iter_value_t<I>* operator->() const noexcept { return addressof(keep_); } };