std::ranges::enumerate_view<V>::iterator

 

C++

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Named requirements

Feature test macros (C++20)

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Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

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Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Ranges library

Range access
begin cbegin end cend	rbegin crbegin rend crend	size ssize data cdata	empty
Range conversions
to (C++23)
Range primitives
range_size_trange_difference_trange_value_trange_reference_t	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)	elements_of (C++23)
Dangling iterator handling
dangling	borrowed_iterator_t	borrowed_subrange_t
Range concepts
range borrowed_range sized_range constant_range (C++23)	common_range view viewable_range	input_range output_range forward_range	bidirectional_range random_access_range contiguous_range
Views
view_interface	subrange
Range factories
empty_viewviews::empty single_viewviews::single	iota_viewviews::iota repeat_viewviews::repeat (C++23)(C++23)	basic_istream_viewviews::istream
Range adaptors
views::all_tviews::all ref_view owning_view as_rvalue_viewviews::as_rvalue (C++23)(C++23) filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while	drop_viewviews::drop drop_while_viewviews::drop_while join_viewviews::join join_with_viewviews::join_with (C++23)(C++23) lazy_split_viewviews::lazy_split split_viewviews::split views::counted common_viewviews::common	reverse_viewviews::reverse as_const_viewviews::as_const (C++23)(C++23) elements_viewviews::elements keys_viewviews::keys values_viewviews::values enumerate_viewviews::enumerate (C++23)(C++23) zip_viewviews::zip (C++23)(C++23) zip_transform_viewviews::zip_transform (C++23)(C++23)	adjacent_viewviews::adjacent (C++23)(C++23) views::pairwise (C++23) adjacent_transform_viewviews::adjacent_transform (C++23)(C++23) views::pairwise_transform (C++23) chunk_viewviews::chunk (C++23)(C++23) slide_viewviews::slide (C++23)(C++23) chunk_by_viewviews::chunk_by (C++23)(C++23) stride_viewviews::stride (C++23)(C++23) cartesian_product_viewviews::cartesian_product (C++23)(C++23)
Range generators
std::generator (C++23)
Range adaptor objects
Range adaptor closure objects
range_adaptor_closure (C++23)
Helper items
copyable-box movable-box (until C++23)(C++23)	simple-view non-propagating-cache

 

std::ranges::enumerate_view

Member functions

enumerate_view::enumerate_view (C++23)

enumerate_view::base (C++23)

enumerate_view::begin (C++23)

enumerate_view::end (C++23)

enumerate_view::size (C++23)

Deduction guides

Nested classes

Iterator

enumerate_view::iterator::iterator (C++23)

enumerate_view::iterator::base (C++23)

enumerate_view::iterator::index (C++23)

enumerate_view::iterator::operator* (C++23)

enumerate_view::iterator::operator[] (C++23)

enumerate_view::iterator::operator++ enumerate_view::iterator::operator++(int) enumerate_view::iterator::operator-- enumerate_view::iterator::operator--(int) enumerate_view::iterator::operator+= enumerate_view::iterator::operator-= (C++23)(C++23)(C++23)(C++23)(C++23)(C++23)

operator==(enumerate_view::iterator) operator<=>(enumerate_view::iterator) (C++23)(C++23)

operator+(enumerate_view::iterator) operator-(enumerate_view::iterator) (C++23)(C++23)

iter_move(enumerate_view::iterator) (C++23)

Sentinel

enumerate_view::sentinel::sentinel (C++23)

enumerate_view::sentinel::base (C++23)

operator==(enumerate_view::iterator,enumerate_view::sentinel) (C++23)

operator-(enumerate_view::iterator,enumerate_view::sentinel) (C++23)

 

template< bool Const > class /*iterator*/		(since C++23)

The return type of enumerate_view::begin, and of enumerate_view::end when the underlying view V 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 two non-static data members:

• current_ of type ranges::iterator_t<Base>, that holds an iterator to the current element;
• pos_ of type difference_type, that holds current index.

These names are 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_category	std::input_iterator_tag
iterator_concept	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.
difference_type	ranges::range_difference_t<Base>
value_type	std::tuple<difference_type, ranges::range_value_t<Base>>.
reference-type (private)	std::tuple<difference_type, ranges::range_reference_t<Base>>. The name is for exposition only.

Member functions

(constructor) (C++23)	constructs an iterator (public member function)
base (C++23)	returns an iterator to current element (public member function)
index (C++23)	returns current index (public member function)
operator* (C++23)	accesses the element (public member function)
operator[] (C++23)	accesses an element by index (public member function)
operator++operator++(int)operator--operator--(int)operator+=operator-= (C++23)	advances or decrements the underlying iterator (public member function)

Non-member functions

operator==operator<=> (C++23)	compares the underlying iterators (function)
operator+operator- (C++23)	performs iterator arithmetic (function)
iter_move (C++23)	casts the result of dereferencing the underlying iterator to its associated rvalue reference type (function)

References

• C++23 standard (ISO/IEC 14882:2023):

• 26.7.23.3 Class template enumerate_view::iterator [range.enumerate.iterator]