std::ranges::concat_view<Views...>::end
constexpr auto end()
requires (!(/*simple-view*/<Views> && ...));
| (1) | (since C++26) |
constexpr auto end() const
requires (ranges::range<const Views> && ...) &&
/*concatable*/<const Views...>;
| (2) | (since C++26) |
Returns an iterator or std::default_sentinel that compares equal to the past-the-end iterator of the concat_view.
constexprautoN=sizeof...(Views);
ifconstexpr(ranges::common_range<Views...[N-1]>)
return iterator <false>(this,std::in_place_index<N-1>,
ranges::end(std::get<N-1>(views_ )));
else
returnstd::default_sentinel;
constexprautoN=sizeof...(Views);
ifconstexpr(ranges::common_range<constViews...[N-1]>)
return iterator <true>(this,std::in_place_index<N-1>,
ranges::end(std::get<N-1>(views_ )));
else
returnstd::default_sentinel;
Return value
As described above.
Example
#include <concepts>
#include <iterator>
#include <print>
#include <ranges>
int main()
{
static constexpr int p[]{37, 42, 69};
static constexpr auto q = {19937, 1729};
constexpr auto cat = std::ranges::views::concat(p, q);
static_assert(not std::same_as<std::default_sentinel_t, decltype(cat.end())>);
static_assert(cat.end()[-1] == 1729);
std::println("{}", cat);
}
Output:
[37, 42, 69, 19937, 1729]
See also
| returns an iterator to the beginning (public member function) |
|
|
(C++20) | returns a sentinel indicating the end of a range (customization point object) |
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