std::ranges::chunk_by_view<V,Pred>::begin

From cppreference.com
< cpp‎ | ranges‎ | chunk by view
C++
Ranges library
Range adaptors
std::ranges::chunk_by_view
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_

Example

This section is incomplete
Reason: no example

See also

 returns an iterator or a sentinel to the end
(public member function)
(C++20)
 returns an iterator to the beginning of a range
(customization point object)
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/ranges/chunk_by_view/begin&oldid=176646