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Showing content from https://en.cppreference.com/w/cpp/algorithm/../iterator/basic_const_iterator/operator_arith2.html below:

operator+, operator-(std::basic_const_iterator) - cppreference.com

friend constexpr basic_const_iterator

    operator+( const basic_const_iterator& i, difference_type n )

        requires std::random_access_iterator<Iter>; (1) (since C++23) friend constexpr basic_const_iterator

    operator+( difference_type n, const basic_const_iterator& i )

        requires std::random_access_iterator<Iter>; (2) (since C++23) friend constexpr basic_const_iterator

    operator-( const basic_const_iterator& i, difference_type n )

        requires std::random_access_iterator<Iter>; (3) (since C++23)

Returns the iterator i incremented or decremented by n.

1,2) Returns an iterator which is advanced by n positions.

3) Returns an iterator which is advanced by -n positions.

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

[edit] Return value

1,2) basic_const_iterator(i.base() + n)

3) basic_const_iterator(i.base() - n)

[edit] Example

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