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

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

Advances or decrements the iterator.

Let current_, end_, and n_ be the underlying data members of chunk_view::iterator.

1) Equivalent to:

missing_ = ranges::advance(current_, n_, end_);
return *this;

Before the invocation the expression current_ != end_ must be true, otherwise the behavior is undefined.

2) Equivalent to: auto tmp = *this; ++*this; return tmp;.

3) Equivalent to:

ranges::advance(current_, missing_ - n_);
missing_ = 0;
return *this;

4) Equivalent to: auto tmp = *this; --*this; return tmp;.

true

6) Equivalent to: return *this += -x;.

a position relative to current location

1,3,5,6) *this

2,4) a copy of *this that was made before the change