1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10
11// constexpr sentinel_t<Base> base() const;
12
13#include <cassert>
14#include <ranges>
15#include <tuple>
16#include <type_traits>
17#include <utility>
18
19struct Sent {
20 int i;
21
22 friend constexpr bool operator==(std::tuple<int>*, const Sent&) { return true; }
23};
24
25constexpr bool test() {
26 using BaseRange = std::ranges::subrange<std::tuple<int>*, Sent>;
27 using EleRange = std::ranges::elements_view<BaseRange, 0>;
28 using EleSent = std::ranges::sentinel_t<EleRange>;
29
30 const EleSent st{Sent{5}};
31 std::same_as<Sent> decltype(auto) base = st.base();
32 assert(base.i == 5);
33
34 return true;
35}
36
37int main(int, char**) {
38 test();
39 static_assert(test());
40 return 0;
41}
42

source code of libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/base.pass.cpp