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std::ranges::chunk_by_view<V,Pred>::iterator::operator++,--

constexpr /iterator/& operator++();	(1)	(since C++23)
constexpr /iterator/ operator++(int);	(2)	(since C++23)
constexpr /iterator/& operator--() requires ranges::bidirectional_range<V>;	(3)	(since C++23)
constexpr /iterator/ operator--(int) requires ranges::bidirectional_range<V>;	(4)	(since C++23)

Increments or decrements the iterator.

Let parent_, current_, and next_ be the appropriate underlying (exposition-only) data-members of iterator.

Let find-next and find-prev be appropriate (exposition-only) member functions of ranges::chunk_by_view.

1) Equivalent to:

current_ = next_;
next_ = parent_->/*find-next*/(current_);
return *this;

The behavior is undefined if before the call to this operator current_ is equal to next_.

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

3) Equivalent to:

next_ = current_;
current_ = parent_->/*find-prev*/(next_);
return *this;

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

(none).

1,3) *this

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

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