NAME¶

std::ranges::chunk_by_view::begin - std::ranges::chunk_by_view::begin

Synopsis¶

constexpr /*iterator*/ begin(); (since C++23)

Returns an iterator to the first element of the chunk_by_view.

Equivalent to:

ranges::iterator_t<V> iter;

if (begin_.has_value())
iter = begin_.value();
else
{
iter = /*find_next*/(ranges::begin(base()));
begin_ = iter; // caching
}

return /*iterator*/(*this, ranges::begin(base()), iter);

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

Parameters¶

(none)

Return value¶

Iterator to the first element.

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_ (the name is
for exposition only) for use on subsequent calls.

Example¶

This section is incomplete
Reason: no example

See also¶

end returns an iterator or a sentinel to the end
(C++23) (public member function)
ranges::begin returns an iterator to the beginning of a range
(C++20) (customization point object)

Category:¶

* Todo no example