std::ranges...w::iterator(3) C++ Standard Libary std::ranges...w::iterator(3) NAME std::ranges::elements_view::iterator - std::ranges::elements_view::iterator Synopsis template< bool Const > (exposition only*) class /*iterator*/; The return type of elements_view::begin, and of elements_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 Base (private) const V if Const is true, otherwise V. (exposition-only member type*) Denotes: * std::random_access_iterator_tag, if Base models random_access_range. Otherwise, iterator_concept * std::bidirectional_iterator_tag, if Base models bidirectional_range. Otherwise, * std::forward_iterator_tag, if Base models for- ward_range. Otherwise, * std::input_iterator_tag. Not defined, if Base does not model forward_range. Otherwise, * std::input_iterator_tag, if std::get<N>(*current_) is an rvalue. Otherwise, let C be the type iterator_category std::iterator_traits<std::iterator_t<Base>>::iter- ator_category. * std::random_access_iterator_tag, if C models std::derived_from<std::random_access_itera- tor_tag>. Otherwise, * C. value_type std::remove_cvref_t<std::tuple_element_t<N, ranges::range_value_t<Base>>> difference_type ranges::range_difference_t<Base> Data members Member object Definition An iterator of type ranges::iterator_t<Base> to cur- rent element current_ (private) of underlying sequence. (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 N^th tuple 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) 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 only if Base models defined forward_range LWG 3555 C++20 the definition of iterator_concept made to con- sider ignores const See also iterator the return type of ranges::transform_view::begin, and of (C++20) ranges::transform_view::end when the underlying view is a com- mon_range (private member class template) http://cppreference.com 2024.06.10 std::ranges...w::iterator(3)
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