std::ranges::join_with_view<V,Pattern>::iterator<Const>::operator++,--

 

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)

Execution support library (C++26)

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 (C++23)(C++23)     to (C++23)

Dangling iterator handling dangling borrowed_iterator_t borrowed_subrange_t

Range primitives
range_size_trange_difference_trange_value_t elements_of (C++23)	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_reference_trange_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)

Range concepts
range borrowed_range    sized_range	common_range view viewable_range	input_range output_range forward_range	bidirectional_range    random_access_range contiguous_range	constant_range (C++23)

Views
view_interface	subrange

Range factories
empty_viewviews::empty	single_viewviews::single	basic_istream_viewviews::istream	iota_viewviews::iota	repeat_viewviews::repeat (C++23)(C++23)

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 concat_viewviews::concat (C++26)(C++26)	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 closure objects range_adaptor_closure (C++23)

Range adaptor objects

Helper items
copyable-box movable-box (until C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::join_with_view

Member functions

join_with_view::join_with_view

join_with_view::base

join_with_view::begin

join_with_view::end

Deduction guides

Iterator

Member functions

join_with_view::iterator::iterator

join_with_view::iterator::operator*

join_with_view::iterator::operator++ join_with_view::iterator::operator++(int) join_with_view::iterator::operator-- join_with_view::iterator::operator--(int)

Non-member functions

operator==(join_with_view::iterator) (C++23)

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

iter_swap(join_with_view::iterator) (C++23)

Sentinel

join_with_view::sentinel::sentinel

operator==(join_with_view::sentinel) (C++23)

 

constexpr /*iterator*/& operator++();	(1)	(since C++23)
constexpr void operator++( int );	(2)	(since C++23)
constexpr /*iterator*/ operator++( int )     requires std::is_reference_v</*InnerBase*/> &&              ranges::forward_range</*Base*/> &&              ranges::forward_range</*InnerBase*/>;	(3)	(since C++23)
constexpr /*iterator*/& operator--()     requires std::is_reference_v</*InnerBase*/> &&              ranges::bidirectional_range</*Base*/> &&              ranges::bidirectional_range</*InnerBase*/> &&              ranges::common_range</*InnerBase*/> &&              ranges::bidirectional_range</*PatternBase*/> &&              ranges::common_range</*PatternBase*/>;	(4)	(since C++23)
constexpr /*iterator*/ operator--( int )     requires std::is_reference_v</*InnerBase*/> &&              ranges::bidirectional_range</*Base*/> &&              ranges::bidirectional_range</*InnerBase*/> &&              ranges::common_range</*InnerBase*/> &&              ranges::bidirectional_range</*PatternBase*/> &&              ranges::common_range</*PatternBase*/>;	(5)	(since C++23)

Increments or decrements the iterator.

1) Increments the inner iterator as if by std::visit([](auto& it){ ++it; }, inner_it_ );.

After that, adjusts the inner and outer iterators as follows:

• If the incremented inner iterator is the past-the-end iterator of the pattern range, it is set to an iterator to the beginning of the next inner range.
• If the incremented inner iterator is the past-the-end iterator of an inner range, the outer iterator is incremented. Then:

• If the incremented outer iterator is not the past-the-end iterator of the outer range, the inner iterator is set to an iterator to the beginning of the pattern range.
• Otherwise, if std::is_reference_v<InnerBase > is true, the inner iterator is set to a pattern iterator holding a singular value.

• Repeats the operations above until either the inner iterator is not a past-the-end iterator, or the outer iterator is a past-the-end iterator.

2) Equivalent to ++*this;.

3) Equivalent to auto tmp = *this;
++*this;
return tmp;.

4) If the outer iterator is the past-the-end iterator of the outer range, decrements it and sets the inner iterator to the past-the-end iterator of the last inner range, otherwise do nothing.

After that, adjusts the inner and outer iterators as follows:

• If the inner iterator refers to the beginning of an inner range, it is set to the past-the-end iterator of the pattern range.
• If the inner iterator refers to the beginning of the pattern range, the outer iterator is decremented, and the inner iterator is set to the past-the-end iterator of the previous inner range.
• Repeats the operations above until the inner iterator does not refer to the beginning of any range.

Finally, decrements the inner iterator as if by std::visit([](auto& it){ --it; }, inner_it_ );.

5) Equivalent to auto tmp = *this;
--*this;
return tmp;.

Return value

1,4) *this

3,5) A copy of *this that was made before the change.