operator+,-(ranges::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 ( get-view <I>());
return result + ranges::distance ( 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

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 ( 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

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

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>

Parameters

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

Return value

As described above.

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General utilities library
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Ranges library (C++20)
Algorithms library
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Technical specifications
Symbols index
External libraries

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
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)

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

Parameters

Return value

Example

See also

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