operator+,-(ranges::concat_view::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)

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::concat_view

Member functions

concat_view::concat_view

concat_view::begin

concat_view::end

concat_view::size

Deduction guides

Iterator

Member functions

concat_view::iterator::iterator

concat_view::iterator::operator*

concat_view::iterator::operator[]

concat_view::iterator::operator++ concat_view::iterator::operator++(int) concat_view::iterator::operator-- concat_view::iterator::operator--(int) concat_view::iterator::operator+= concat_view::iterator::operator-=

concat_view::iterator::satisfy concat_view::iterator::prev concat_view::iterator::advance-fwd concat_view::iterator::advance-bwd

Non-member functions

operator==(concat_view::iterator) operator<(concat_view::iterator) operator>(concat_view::iterator) operator<=(concat_view::iterator) operator>=(concat_view::iterator) operator<=>(concat_view::iterator)

operator+(concat_view::iterator) operator-(concat_view::iterator)

iter_move(concat_view::iterator)

iter_swap(concat_view::iterator)

 

friend constexpr /*iterator*/     operator+( const /*iterator*/& it, difference_type n )         requires /*concat-is-random-access*/<Const, Views...>;	(1)	(since C++26)
friend constexpr /*iterator*/     operator+( difference_type n, const /*iterator*/& it )         requires /*concat-is-random-access*/<Const, Views...>;	(2)	(since C++26)
friend constexpr /*iterator*/     operator-( const /*iterator*/& it, difference_type n )         requires /*concat-is-random-access*/<Const, Views...>;	(3)	(since C++26)
friend constexpr difference_type     operator-( const /*iterator*/& x, const /*iterator*/& y )         requires /*concat-is-random-access*/<Const, Views...>;	(4)	(since C++26)
friend constexpr difference_type     operator-( const /*iterator*/& x, std::default_sentinel_t )         requires /* see description */;	(5)	(since C++26)
friend constexpr difference_type     operator-( std::default_sentinel_t, const /*iterator*/& x )         requires /* see description */;	(6)	(since C++26)

Increments or decrements the iterator.

1) Equivalent to auto t = it; t += n; return t;.

2) Equivalent to return it + n;.

3) Equivalent to auto t = it; t -= n; return t;.

4) Let Ix be x.it_ .index() and Iy be y.it_ .index():

• If Ix > Iy is true, equivalent to difference_type result = ranges::distance(y.get-iter <Iy>(), y.get-end <Iy>());
  for (std::size_t I = Iy + 1; I < Ix; I++)
      result += ranges::distance(x.get-view <I>());
  return result + ranges::distance(x.get-begin <Ix>(), x.get-iter <Ix>());.
• Otherwise, if Ix < Iy is true, equivalent to return -(y - x);.
• Otherwise, equivalent to return x.get-iter <Ix>() - y.get-iter <Iy>();.

If x.it_ .valueless_by_exception() || y.it_ .valueless_by_exception() is true, the behavior is undefined.

5) Let Ix be x.it_ .index(), equivalent to difference_type result = ranges::distance(x.get-iter <Ix>(), x.get-end <Ix>());
for (std::size_t I = Ix + 1, count = sizeof...(Views); I < count; I++)
    result += ranges::distance(x.get-view <I>());
return -result;.

Let Fs be the pack that consists of all elements of Views except the first element, the expression in the requires clause is equivalent to

(std::sized_sentinel_for<ranges::sentinel_t<maybe-const <Const, Views>>,
                         ranges::iterator_t<maybe-const <Const, Views>>> && ...) &&
    (ranges::sized_range<maybe-const <Const, Fs>> && ...)

.

If x.it_ .valueless_by_exception() is true, the behavior is undefined.

6) Equivalent to return -(x - std::default_sentinel);.

Let Fs be the pack that consists of all elements of Views except the first element, the expression in the requires clause is equivalent to

(std::sized_sentinel_for<ranges::sentinel_t<maybe-const <Const, Views>>,
                         ranges::iterator_t<maybe-const <Const, Views>>> && ...) &&
    (ranges::sized_range<maybe-const <Const, Fs>> && ...)

.

If x.it_ .valueless_by_exception() is true, the behavior is undefined.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when concat_view::iterator <Const> is an associated class of the arguments.

Parameters

it, x, y	-	the iterators
n	-	a position relative to current location

Return value

As described above.

See also

operator++operator++(int)operator--operator--(int)operator+=operator-=

advances or decrements the underlying iterator (public member function)