/*iterator*/() requires std::default_initializable<OuterIter> &&
                        std::default_initializable<InnerIter> = default;
(1) (since C++20)
constexpr /*iterator*/( Parent& parent, OuterIter outer );
(2) (since C++20)
constexpr /*iterator*/( /*iterator*/<!Const> i )
  requires Const &&
           std::convertible_to<ranges::iterator_t<V>, OuterIter> &&
           std::convertible_to<ranges::iterator_t<InnerRng>, InnerIter>;
(3) (since C++20)

Construct an iterator.

1) Default constructor. Value-initializes the underlying iterators, and initializes the pointer to parent ranges::join_view with nullptr.
2) Initializes the underlying outer_ iterator with std::move(outer), and the pointer to parent parent_ with std::addressof(parent); then calls satisfy().
3) Conversion from /*iterator*/<false> to /*iterator*/<true>. Move constructs the underlying iterators outer_ with std::move(i.outer_), inner_ with std::move(i.inner_), and underlying pointer to parent parent_ with i.parent_.


parent - a (possibly const-qualified) ranges::join_view
outer - an iterator into (possibly const-qualified) ranges::iterator_t<Base>
i - an /*iterator*/<false>


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