Modify 24.5.5.1 [common.iterator], class template common_iterator synopsis, as indicated:
namespace std {
template<input_or_output_iterator I, sentinel_for<I> S>
requires (!same_as<I, S> && copyable<I>)
class common_iterator {
public:
constexpr common_iterator() requires default_initializable<I> = default;
constexpr common_iterator(I i);
constexpr common_iterator(S s);
template<class I2, class S2>
requires convertible_to<const I2&, I> && convertible_to<const S2&, S>
constexpr common_iterator(const common_iterator<I2, S2>& x);
template<class I2, class S2>
requires convertible_to<const I2&, I> && convertible_to<const S2&, S> &&
assignable_from<I&, const I2&> && assignable_from<S&, const S2&>
constexpr common_iterator& operator=(const common_iterator<I2, S2>& x);
constexpr decltype(auto) operator*();
constexpr decltype(auto) operator*() const
requires dereferenceable<const I>;
constexpr decltype(auto) operator->() const
requires see below;
constexpr common_iterator& operator++();
constexpr decltype(auto) operator++(int);
template<class I2, sentinel_for<I> S2>
requires sentinel_for<S, I2>
friend constexpr bool operator==(
const common_iterator& x, const common_iterator<I2, S2>& y);
template<class I2, sentinel_for<I> S2>
requires sentinel_for<S, I2> && equality_comparable_with<I, I2>
friend constexpr bool operator==(
const common_iterator& x, const common_iterator<I2, S2>& y);
template<sized_sentinel_for<I> I2, sized_sentinel_for<I> S2>
requires sized_sentinel_for<S, I2>
friend constexpr iter_difference_t<I2> operator-(
const common_iterator& x, const common_iterator<I2, S2>& y);
friend constexpr iter_rvalue_reference_t<I> iter_move(const common_iterator& i)
noexcept(noexcept(ranges::iter_move(declval<const I&>())))
requires input_iterator<I>;
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&>())));
private:
variant<I, S> v_; // exposition only
};
[…]
}
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