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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../ranges/chunk_by_view/begin.html below:

std::ranges::chunk_by_view<V,Pred>::begin - cppreference.com

constexpr /*iterator*/ begin();

(since C++23)

Returns an iterator to the first element of the chunk_by_view.

Equivalent to:

The behavior is undefined if the underlying predicate pred_ does not contain a value.

[edit] Parameters

(none)

[edit] Return value

Iterator to the first element.

[edit] Notes

In order to provide the amortized constant-time complexity required by the range concept, this function caches the result within the data member begin_ for use on subsequent calls.

[edit] Example [edit] See also returns an iterator or a sentinel to the end
(public member function) [edit] returns an iterator to the beginning of a range
(customization point object)[edit]

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