std::ranges::transform_view<V,F>::iterator

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

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

Input/output library

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::transform_view

Member functions

transform_view::transform_view (C++20)

transform_view::base (C++20)

transform_view::begin (C++20)

transform_view::end (C++20)

transform_view::size (C++20)

Deduction guides

Iterator

transform_view::iterator::iterator (C++20)

transform_view::iterator::base (C++20)

transform_view::iterator::operator* (C++20)

transform_view::iterator::operator[] (C++20)

transform_view::iterator::operator++ transform_view::iterator::operator++(int) transform_view::iterator::operator-- transform_view::iterator::operator--(int) transform_view::iterator::operator+= transform_view::iterator::operator-= (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

operator==(transform_view::iterator) operator<(transform_view::iterator) operator>(transform_view::iterator) operator<=(transform_view::iterator) operator>=(transform_view::iterator) operator<=>(transform_view::iterator) (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

operator+(transform_view::iterator) operator-(transform_view::iterator) (C++20)(C++20)

iter_move(transform_view::iterator) (C++20)

Sentinel

transform_view::sentinel::sentinel (C++20)

transform_view::sentinel::base (C++20)

operator==(transform_view::iterator,transform_view::sentinel) (C++20)

operator-(transform_view::iterator,transform_view::sentinel) (C++20)

 

template< bool Const > class /*iterator*/		(since C++20) (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 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.

Typical implementation holds two data members: an iterator into (possibly const-qualified) V, and a pointer to parent transform_view.

Member types

Member type	Definition
Parent (private)	const ranges::transform_view<V, F> if Const is true, otherwise ranges::transform_view<V, F>. The name is for exposition only.
Base (private)	const V if Const is true, otherwise V. The name is for exposition only.
iterator_concept	std::random_access_iterator_tag if Base models random_access_range, std::bidirectional_iterator_tag if Base models bidirectional_range, std::forward_iterator_tag if Base models forward_range, std::input_iterator_tag otherwise.
iterator_category	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. Else, let C be std::iterator_traits<ranges::iterator_t<Base>>::iterator_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>

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 transformed 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)
iter_move (C++20)	obtains an rvalue reference to the transformed element (function)

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	defined only if Base models forward_range
LWG 3555	C++20	the definition of iterator_concept ignores const	made to consider
LWG 3798	C++20	iterator_category is input-only if transformation result is rvalue reference	may have a stronger category