std::ranges...ew::iterator(3) C++ Standard Libary std::ranges...ew::iterator(3) NAME std::ranges::transform_view::iterator - std::ranges::transform_view::itera- tor Synopsis template< bool Const > (since C++20) class /*iterator*/ (exposition only*) The return type of transform_view::begin, and of transform_view::end when the underlying view is a common_range. The type /*iterator*/<true> is returned by the const-qualified over- loads. The type /*iterator*/<false> is returned by the non-const-qualified overloads. Member types Member type Definition const ranges::transform_view<V, F> if Const is true, otherwise Parent (private) ranges::transform_view<V, F>. (exposition-only member type*) Base (private) const V if Const is true, otherwise V. (exposition-only member type*) std::random_access_iterator_tag if Base models random_access_range, iterator_concept std::bidirectional_iterator_tag if Base models bidirectional_range, std::forward_iterator_tag if Base models for- ward_range, std::input_iterator_tag otherwise. Not defined if Base does not model forward_range. Otherwise, if std::invoke_result_t<F&, ranges::range_reference_t<Base>> is not a reference, std::input_iterator_tag. iterator_category Else, let C be std::iterator_traits<ranges::iterator_t<Base>>::itera- tor_category. If C is std::contiguous_iterator_tag, the type is std::random_access_iterator_tag; otherwise, the type is C. value_type std::remove_cvref_t<std::invoke_result_t<F&, ranges::range_reference_t<Base>>> difference_type ranges::range_difference_t<Base> Data members Member object Definition current_ (private) An iterator into (possibly const-qualified) V. (exposition-only member object*) parent_ (private) A pointer to parent transform_view. (exposition-only member object*) Member functions constructor constructs an iterator (C++20) (public member function) base returns the underlying iterator (C++20) (public member function) operator* accesses the transformed element (C++20) (public member function) operator[] accesses an element by index (C++20) (public member function) operator++ operator++(int) operator-- advances or decrements the underlying iterator operator--(int) (public member function) operator+= operator-= (C++20) Non-member functions operator== operator< operator> compares the underlying iterators operator<= (function) operator>= operator<=> (C++20) operator+ performs iterator arithmetic operator- (function) (C++20) iter_move obtains an rvalue reference to the transformed element (C++20) (function) Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior P2259R1 C++20 member iterator_category is always defined defined only if Base models forward_range LWG 3555 C++20 the definition of iterator_concept ignores made to consider const LWG 3798 C++20 iterator_category is input-only if may have a stronger transformation result is rvalue reference category http://cppreference.com 2024.06.10 std::ranges...ew::iterator(3)
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