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std::ranges::enumerate_view<V>::iterator<Const>::operator++,--,+=,-=

constexpr /iterator/& operator++();	(1)	(since C++23)
constexpr void operator++( int );	(2)	(since C++23)
constexpr /iterator/ operator++( int ) requires ranges::forward_range<Base>;	(3)	(since C++23)
constexpr /iterator/& operator--() requires ranges::bidirectional_range<Base>;	(4)	(since C++23)
constexpr /iterator/ operator--( int ) requires ranges::bidirectional_range<Base>;	(5)	(since C++23)
constexpr /iterator/& operator+=( difference_type n ) requires ranges::random_access_range<Base>;	(6)	(since C++23)
constexpr /iterator/& operator-=( difference_type n ) requires ranges::random_access_range<Base>;	(7)	(since C++23)

Increments or decrements the iterator.

Let current_ be the underlying iterator and pos_ be the underlying index.

1) Equivalent to ++current_; ++pos_; return *this;

2) Equivalent to ++current_;

3) Equivalent to auto tmp = *this; ++*this; return tmp;

4) Equivalent to --current_; --pos_; return *this;

5) Equivalent to auto tmp = *this; --*this; return tmp;

6) Equivalent to current_ += n; pos_ += n; return *this;

7) Equivalent to current_ -= n; pos_ -= n; return *this;

position relative to current location

1,4,6,7) *this

2) (none)

3,5) a copy of *this that was made before the change