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 overloads. 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 forward_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>>::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>

Data members

Member object Definition
An iterator of type ranges::iterator_t<Base> to current 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 retroactively 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 consider
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 common_range
(private member class template)