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

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< cpp‎ | ranges‎ | enumerate view‎ | iterator

friend constexpr /*iterator*/ operator+( const /*iterator*/& i, difference_type n ) requires ranges::random_access_range<Base>; | (1) | (since C++23)
friend constexpr /*iterator*/ operator+( difference_type n, const /*iterator*/& i ) requires ranges::random_access_range<Base>; | (2) | (since C++23)
friend constexpr /*iterator*/ operator-( const /*iterator*/& i, difference_type n ) requires ranges::random_access_range<Base>; | (3) | (since C++23)
friend constexpr difference_type operator-( const /*iterator*/& i, const /*iterator*/& j ); | (4) | (since C++23)

Performs iterator arithmetic or calculates the distance.

Let `pos_` be the underlying index and `Base` be the (possibly const-qualified) type of underlying view.

Equivalent to:

1) auto temp = i; temp += n; return temp;.
2) return i + n;.
3) auto temp = i; temp -= n; return temp;.
4) return i.pos_ - j.pos_;.

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

### Parameters

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

### Return value

1-2) An incremented iterator
3) A decremented iterator
4) A distance between given iterators.

### Example

| This section is incomplete Reason: no example

### See also

operator++operator++(int)operator--operator--(int)operator+=operator-= (C++23) | advances or decrements the underlying iterator (public member function)

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