NAME¶

std::ranges::common_view::end - std::ranges::common_view::end

Synopsis¶

constexpr auto end() requires (!__simple_view<V>); (1) (since C++20)
constexpr auto end() const requires ranges::range<const V>; (2) (since C++20)

1) Returns an iterator representing the end of the common_view, that is:
* ranges::begin(base_) + ranges::size(base_), if both
ranges::random_access_range<V> and ranges::sized_range<V> are satisfied,
* std::common_iterator<ranges::iterator_t<V>,
ranges::sentinel_t<V>>(ranges::end(base_)) otherwise.
Here base_ (the name is for exposition purposes only) is the underlying view.
2) Same as (1), but V is const-qualified.

Parameters¶

(none)

Return value¶

An iterator representing the end of the underlying view.

Example¶

// Run this code

#include <iostream>
#include <numeric>
#include <ranges>

int main()
{
constexpr int n{4};

constexpr auto v1 = std::views::iota(1)
| std::views::take(n)
| std::views::common
;
constexpr auto v2 = std::views::iota(2)
| std::views::take(n)
;
const int product = std::inner_product(v1.begin(), v1.end(),
v2.begin(),
0);
std::cout << product << '\n';
}

Output:¶

40

Defect reports

The following behavior-changing defect reports were applied retroactively to
previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 4012 C++20 non-const overload missed simple-view check added

See also¶

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