25 Iterators library [iterators]

25.5 Iterator adaptors [predef.iterators]

25.5.5 Common iterators [iterators.common]

25.5.5.7 Customizations [common.iter.cust]

friend constexpr decltype(auto) iter_move(const common_iterator& i)
  noexcept(noexcept(ranges::iter_move(declval<const I&>())))
    requires input_iterator<I>;

Preconditions: holds_alternative<I>(i.v_) is true.

Effects: Equivalent to: return ranges::iter_move(get<I>(i.v_));

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template<indirectly_swappable<I> I2, class S2>
  friend constexpr void iter_swap(const common_iterator& x, const common_iterator<I2, S2>& y)
    noexcept(noexcept(ranges::iter_swap(declval<const I&>(), declval<const I2&>())));

Preconditions: holds_alternative<I>(x.v_) and holds_alternative<I2>(y.v_) are each true.

Effects: Equivalent to ranges::iter_swap(get<I>(x.v_), get<I2>(y.v_)).