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// sentinel() = default;
12
13#include <cassert>
14#include <ranges>
15#include <tuple>
16
17struct PODSentinel {
18 int i; // deliberately uninitialised
19
20 friend constexpr bool operator==(std::tuple<int>*, const PODSentinel&) { return true; }
21};
22
23struct Range : std::ranges::view_base {
24 std::tuple<int>* begin() const;
25 PODSentinel end();
26};
27
28constexpr bool test() {
29 using EleView = std::ranges::elements_view<Range, 0>;
30 using Sentinel = std::ranges::sentinel_t<EleView>;
31 static_assert(!std::is_same_v<Sentinel, std::ranges::iterator_t<EleView>>);
32
33 {
34 Sentinel s;
35 assert(s.base().i == 0);
36 }
37 {
38 Sentinel s = {};
39 assert(s.base().i == 0);
40 }
41 return true;
42}
43
44int main(int, char**) {
45 test();
46 static_assert(test());
47
48 return 0;
49}
50

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