Docs4dev
Docs
cpp / latest / ranges / join_with_view / begin.html

std::ranges::join_with_view<V,Pattern>::begin

constexpr auto begin();
 (1) (since C++23) 
constexpr auto begin() const
  requires ranges::input_range<const V> &&
           ranges::forward_range<const Pattern> &&
           std::is_reference_v<ranges::range_reference_t<const V>>;
 (2) (since C++23)

Returns an iterator to the first element of the join_with_view.

Let base_ denote the underlying view:

1) Equivalent to return /*iterator*/<true>{*this, ranges::begin(base_)}; if V and Pattern each model __SimpleView and ranges::range_reference_t<V> is a reference type; otherwise equivalent to return /*iterator*/<false>{*this, ranges::begin(base_)};.
2) Equivalent to return /*iterator*/<true>{*this, ranges::begin(base_)};.

Parameters

(none)

Return value

An iterator to the first element of the join_with_view, as described above.

Example

See also

(C++23)
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)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/ranges/join_with_view/begin