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

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< cpp‎ | ranges‎ | cartesian product view‎ | iterator

friend constexpr /*iterator*/ operator+( const /*iterator*/& i, difference_type n ) requires /*cartesian-product-is-random-access*/<Const, First, Vs...>; | (1) | (since C++23)
friend constexpr /*iterator*/ operator+( difference_type n, const /*iterator*/& i ) requires /*cartesian-product-is-random-access*/<Const, First, Vs...>; | (2) | (since C++23)
friend constexpr /*iterator*/ operator-( const /*iterator*/& i, difference_type n ) requires /*cartesian-product-is-random-access*/<Const, First, Vs...>; | (3) | (since C++23)
friend constexpr difference_type operator-( const /*iterator*/& i, const /*iterator*/& j ) requires /*cartesian-is-sized-sentinel*/<Const, iterator_t, First, Vs...>; | (4) | (since C++23)
friend constexpr difference_type operator-( const /*iterator*/& i, std::default_sentinel_t ) requires /*cartesian-is-sized-sentinel*/<Const, ranges::sentinel_t, First, Vs...>; | (5) | (since C++23)
friend constexpr difference_type operator-( std::default_sentinel_t s, const /*iterator*/& i ) requires /*cartesian-is-sized-sentinel*/<Const, ranges::sentinel_t, First, Vs...>; | (6) | (since C++23)

Performs iterator arithmetic or calculates the distance.

Let `current_` denote the underlying tuple of iterators and `parent_` denote the underlying pointer to `cartesian_product_view`.

1) Equivalent to: return /*iterator*/(i) += n;.
2) Equivalent to: return i + n;.
3) Equivalent to: return /*iterator*/(i) -= n;.
4) Equivalent to: return i. `distance_from` (j.current_);.
5) Let /*end-tuple*/ be an object of a type that is a specialization of tuple, such that:

- std::get<0>(/*end-tuple*/) has the same value as ranges::end (std::get<0>(i.parent_->bases_));
- std::get<N>(/*end-tuple*/) has the same value as ranges::begin (std::get<N>(i.parent_->bases_)) for every integer 1 ≤ N ≤ sizeof...(Vs).

Equivalent to: return i. `distance_from` (/*end-tuple*/);.
6) Equivalent to: return -(i - s);.

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

### Parameters

i, j | - | the iterators
n | - | the position relative to current location
s | - | the sentinel

### Return value

1,2) An incremented iterator.
3) A decremented iterator.
4) A distance between given iterators.
5,6) A distance 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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