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, c++20
10
11 // sentinel() = default;
12
13 #include <cassert>
14 #include <ranges>
15 #include <tuple>
16
17 struct PODSentinel {
18 bool b; // deliberately uninitialised
19
operator ==(int *,const PODSentinel & s)20 friend constexpr bool operator==(int*, const PODSentinel& s) { return s.b; }
21 };
22
23 struct Range : std::ranges::view_base {
24 int* begin() const;
25 PODSentinel end();
26 };
27
test()28 constexpr bool test() {
29 {
30 using R = std::ranges::zip_view<Range>;
31 using Sentinel = std::ranges::sentinel_t<R>;
32 static_assert(!std::is_same_v<Sentinel, std::ranges::iterator_t<R>>);
33
34 std::ranges::iterator_t<R> it;
35
36 Sentinel s1;
37 assert(it != s1); // PODSentinel.b is initialised to false
38
39 Sentinel s2 = {};
40 assert(it != s2); // PODSentinel.b is initialised to false
41 }
42 return true;
43 }
44
main(int,char **)45 int main(int, char**) {
46 test();
47 static_assert(test());
48
49 return 0;
50 }
51