W3cubDocs

/C++

std::ranges::elements_view<V,N>::iterator

template< bool Const >
class /*iterator*/;

(since C++20)

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 overloads. The type /*iterator*/<false> is returned by the non-const-qualified overloads.

The name of this class template (shown here as /*iterator*/) is unspecified.

Data members

Typical implementations of /*iterator*/ hold only one non-static data member current_ of type ranges::iterator_t<Base>. The name is for exposition only.

Member types

Member type	Definition
`Base` (private)	`const V` if `Const` is `true`, otherwise `V`. The name is for exposition only.
`iterator_concept`	Denotes: `std::random_access_iterator_tag`, if `Base` models `random_access_range`. Otherwise, `std::bidirectional_iterator_tag`, if `Base` models `bidirectional_range`. Otherwise, `std::forward_iterator_tag`, if `Base` models `forward_range`. Otherwise, `std::input_iterator_tag`.
`iterator_category`	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 `std::iterator_traits<std::iterator_t<Base>>::iterator_category`. `std::random_access_iterator_tag`, if `C` models `std::derived_from<std::random_access_iterator_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>`

Member functions

(constructor) (C++20)	constructs an iterator (public member function)
base (C++20)	returns the underlying iterator (public member function)
operator* (C++20)	accesses the `N`^th tuple element (public member function)
operator[] (C++20)	accesses an element by index (public member function)
operator++operator++(int)operator--operator--(int)operator+=operator-= (C++20)	advances or decrements the underlying iterator (public member function)

Non-member functions

operator==operator<operator>operator<=operator>=operator<=> (C++20)	compares the underlying iterators (function)
operator+operator- (C++20)	performs iterator arithmetic (function)

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.