std::ranges::lazy_split_view<V,Pattern>::end
constexpr auto end() requires ranges::forward_range<V> && ranges::common_range<V>; | (1) | (since C++20) |
constexpr auto end() const; | (2) | (since C++20) |
Returns an iterator or sometimes a sentinel representing the end of the view. Let base_ be the underlying view.
1) Returns an iterator. Equivalent to:
return /*outer_iterator*/</*simple_view*/<V> && /*simple_view*/<Pattern>>{*this, ranges::end(base_)};.
2) Returns an
outer_iterator or a std::default_sentinel. Equivalent to:
if constexpr (ranges::forward_range<V> && ranges::forward_range<const V> &&
ranges::common_range<const V> && ranges::forward_range<const Pattern>)
return /*outer_iterator*/<true>{*this, ranges::end(base_)};
else
return std::default_sentinel;
Return value
An outer_iterator or a std::default_sentinel representing the end of the view.
Example
#include <iostream>
#include <ranges>
#include <string_view>
int main()
{
constexpr std::string_view keywords{"false float for friend"};
std::ranges::lazy_split_view kw{keywords, ' '};
const auto count = std::ranges::distance(kw.begin(), kw.end());
std::cout << "Words count: " << count << '\n';
}
Output:
Words count: 4
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 3592 | C++20 |
lazy_split_view does not check if Pattern is a simple view |
/*simple_view*/<Pattern> is examined |
| LWG 3599 | C++20 | the const overload (2) does not checkranges::forward_range<const Pattern> | checked |
See also
| returns an iterator to the beginning (public member function) |
|
| returns an iterator or a sentinel to the end (public member function of std::ranges::split_view<V,Pattern>) |
|
|
(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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