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

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C++
Ranges library
Range adaptors
std::ranges::concat_view
Member functions
Deduction guides
Iterator
Member functions
Non-member functions
operator+ (concat_view:: iterator )
operator- (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 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.

Example

This section is incomplete
Reason: no example

See also

advances or decrements the underlying iterator
(public member function)
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