std::ranges::common_view<V>::end
constexpr auto end() requires (!/*simple-view*/<V>); | (1) | (since C++20) |
constexpr auto end() const requires ranges::range<const V>; | (2) | (since C++20) |
common_view, that is: -
ranges::begin(base_)+ranges::distance(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.
2) Same as (1), but
V is const-qualified.Return value
An iterator representing the end of the underlying view.
Example
#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
| returns an iterator to the beginning (public member function) |
|
|
(C++20) | returns an iterator to the beginning of a range (customization point object) |
|
(C++20) | returns a sentinel indicating the end of a range (customization point object) |
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https://en.cppreference.com/cpp/ranges/common_view/end
