std::ranges::iterator_t, std::ranges::const_iterator_t, std::ranges::sentinel_t, std::ranges::const_sentinel_t, std::ranges::range_size_t, std::ranges::range_difference_t, std::ranges::range_value_t, std::ranges::range_reference_t

 

哋它亢++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++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
std::from_range_t std::from_range (哋它亢++23)(哋它亢++23)	to (哋它亢++23)
Range primitives
range_size_trange_difference_trange_value_trange_reference_t	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (哋它亢++23)(哋它亢++23)	range_const_reference_trange_rvalue_reference_trange_common_reference_t (哋它亢++23)	elements_of (哋它亢++23)
Dangling iterator handling
dangling	borrowed_iterator_t	borrowed_subrange_t
Range concepts
range borrowed_range sized_range constant_range (哋它亢++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 (哋它亢++23)(哋它亢++23)	basic_istream_viewviews::istream
Range adaptors
views::all_tviews::all ref_view owning_view as_rvalue_viewviews::as_rvalue (哋它亢++23)(哋它亢++23) filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while concat_viewviews::concat (哋它亢++26)(哋它亢++26)	drop_viewviews::drop drop_while_viewviews::drop_while join_viewviews::join join_with_viewviews::join_with (哋它亢++23)(哋它亢++23) lazy_split_viewviews::lazy_split split_viewviews::split views::counted common_viewviews::common	reverse_viewviews::reverse as_const_viewviews::as_const (哋它亢++23)(哋它亢++23) elements_viewviews::elements keys_viewviews::keys values_viewviews::values enumerate_viewviews::enumerate (哋它亢++23)(哋它亢++23) zip_viewviews::zip (哋它亢++23)(哋它亢++23) zip_transform_viewviews::zip_transform (哋它亢++23)(哋它亢++23)	adjacent_viewviews::adjacent (哋它亢++23)(哋它亢++23) views::pairwise (哋它亢++23) adjacent_transform_viewviews::adjacent_transform (哋它亢++23)(哋它亢++23) views::pairwise_transform (哋它亢++23) chunk_viewviews::chunk (哋它亢++23)(哋它亢++23) slide_viewviews::slide (哋它亢++23)(哋它亢++23) chunk_by_viewviews::chunk_by (哋它亢++23)(哋它亢++23) stride_viewviews::stride (哋它亢++23)(哋它亢++23) cartesian_product_viewviews::cartesian_product (哋它亢++23)(哋它亢++23)
Range generators
std::generator (哋它亢++23)
Range adaptor objects
Range adaptor closure objects
range_adaptor_closure (哋它亢++23)
Helper items
copyable-box movable-box (until 哋它亢++23)(哋它亢++23)	simple-view non-propagating-cache

 

Defined in header <ranges>
template< class T > using iterator_t = decltype(ranges::begin(std::declval<T&>()));	(1)	(since 哋它亢++20)
template< ranges::range R > using const_iterator_t = decltype(ranges::cbegin(std::declval<R&>()));	(2)	(since 哋它亢++23)
template< ranges::range R > using sentinel_t = decltype(ranges::end(std::declval<R&>()));	(3)	(since 哋它亢++20)
template< ranges::range R > using const_sentinel_t = decltype(ranges::cend(std::declval<R&>()));	(4)	(since 哋它亢++23)
template< ranges::sized_range R > using range_size_t = decltype(ranges::size(std::declval<R&>()));	(5)	(since 哋它亢++20)
template< ranges::range R > using range_difference_t = std::iter_difference_t<ranges::iterator_t<R>>;	(6)	(since 哋它亢++20)
template< ranges::range R > using range_value_t = std::iter_value_t<ranges::iterator_t<R>>;	(7)	(since 哋它亢++20)
template< ranges::range R > using range_reference_t = std::iter_reference_t<ranges::iterator_t<R>>;	(8)	(since 哋它亢++20)
template< ranges::range R > using range_const_reference_t =     std::iter_const_reference_t<ranges::iterator_t<R>>;	(9)	(since 哋它亢++23)
template< ranges::range R > using range_rvalue_reference_t =     std::iter_rvalue_reference_t<ranges::iterator_t<R>>;	(10)	(since 哋它亢++20)
template< ranges::range R > using range_common_reference_t =     std::iter_common_reference_t<ranges::iterator_t<R>>;	(11)	(since 哋它亢++20)

1) Used to obtain the iterator type of the type T.

2) Used to obtain the constant iterator type of the range type R.

3) Used to obtain the sentinel type of the range type R.

4) Used to obtain the constant sentinel type of the range type R.

5) Used to obtain the size type of the sized_range type R.

6) Used to obtain the difference type of the iterator type of range type R.

7) Used to obtain the value type of the iterator type of range type R.

8) Used to obtain the reference type of the iterator type of range type R.

9) Used to obtain the constant reference type of the iterator type of range type R.

10) Used to obtain the rvalue reference type of the iterator type of range type R.

11) Used to obtain the common reference type of the iterator type of range type R.

Template parameters

T	-	a type that can be used in std::ranges::begin
R	-	a range type or a sized_range type

Notes

iterator_t can be applied to non-range types, e.g. arrays with unknown bound.

Defect reports

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

DR	Applied to	Behavior as published	Correct behavior
LWG 3860	哋它亢++20	range_common_reference_t was missing	added
LWG 3946	哋它亢++23	const_iterator_t and const_sentinel_t were inconsistent with the result of ranges::cbegin and ranges::cend respectively	tweaked

See also

iter_value_titer_reference_titer_const_reference_titer_difference_titer_rvalue_reference_titer_common_reference_t (哋它亢++20)(哋它亢++20)(哋它亢++23)(哋它亢++20)(哋它亢++20)(哋它亢++20)

computes the associated types of an iterator (alias template)