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std::ranges::transform_view<V,F>::iterator<Const>::iterator 

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

Construct an iterator.

1) Default constructor. Value-initializes the underlying iterator, and initializes the pointer to parent transform_view with nullptr.
2) Initializes the underlying iterator with std::move(current), and the pointer to parent with std::addressof(parent).
3) Conversion from /*iterator*/<false> to /*iterator*/<true>. Move constructs corresponding members.

Parameters

parent - a (possibly const-qualified) std::ranges::transform_view
current - an iterator into (possibly const-qualified) V
i - an /*iterator*/<false>

Example

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https://en.cppreference.com/w/cpp/ranges/transform_view/iterator/iterator