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std::ranges::common_view<V>::end - cppreference.com

From cppreference.com

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::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:

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) [edit]
returns an iterator to the beginning of a range
(customization point object)[edit]
returns a sentinel indicating the end of a range
(customization point object)[edit]