# operator+,-(ranges::chunk_view::iterator)

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< cpp‎ | ranges‎ | chunk view‎ | iterator

friend constexpr /*iterator*/ operator+( const /*iterator*/& i, difference_type pos ) requires ranges::random_access_range <Base>; | (1) | (since C++23)
friend constexpr /*iterator*/ operator+( difference_type pos, const /*iterator*/& i ) requires ranges::random_access_range <Base>; | (2) | (since C++23)
friend constexpr /*iterator*/ operator-( const /*iterator*/& i, difference_type pos ) requires ranges::random_access_range <Base>; | (3) | (since C++23)
friend constexpr difference_type operator-( const /*iterator*/& i, const /*iterator*/& j ) requires std::sized_sentinel_for < ranges::iterator_t <Base>, ranges::iterator_t <Base>>; | (4) | (since C++23)
friend constexpr difference_type operator-( std::default_sentinel_t, const /*iterator*/& i ) requires std::sized_sentinel_for < ranges::sentinel_t <Base>, ranges::iterator_t <Base>>; | (5) | (since C++23)
friend constexpr difference_type operator-( const /*iterator*/& i, std::default_sentinel_t ) requires std::sized_sentinel_for < ranges::sentinel_t <Base>, ranges::iterator_t <Base>>; | (6) | (since C++23)

Performs iterator arithmetic or calculates the distance.

Let `current_`, `end_`, `n_`, and `missing_` be the underlying data members.

Equivalent to:

1,2) auto r = i; r += pos; return r;.
3) auto r = i; r -= pos; return r;.
4) return (i.current_ - j.current_ + i.missing_ - j.missing_) / i.n_;.
5) return /*div-ceil*/(i.end_ - i.current_, i.n_);.
6) return -(y - x);.

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

### Parameters

i, j | - | the iterators
pos | - | the position relative to current location

### Return value

1,2) An incremented iterator.
3) A decremented iterator.
4) A distance (in number of elements, i.e. chunks) between given iterators.
5,6) A distance (in number of elements) between given iterator and sentinel.

### Example

| This section is incomplete Reason: no example

### See also

operator++operator++(int)operator--operator--(int)operator+=operator-= | advances or decrements the underlying iterator (public member function)

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