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 explicit sentinel(sentinel_t<Base> end);
12
13 #include <cassert>
14 #include <ranges>
15 #include <tuple>
16 #include <utility>
17
18 struct Sent {
19 int i;
20
operator ==(std::tuple<int> *,const Sent &)21 friend constexpr bool operator==(std::tuple<int>*, const Sent&) { return true; }
22 };
23
24 struct Range : std::ranges::view_base {
25 std::tuple<int>* begin() const;
26 Sent end();
27 };
28
29 // Test explicit
30
31 static_assert(std::is_constructible_v<std::ranges::sentinel_t<std::ranges::elements_view<Range, 0>>, Sent>);
32 static_assert(!std::is_convertible_v<Sent, std::ranges::sentinel_t<std::ranges::elements_view<Range, 0>>>);
33
test()34 constexpr bool test() {
35 // base is init correctly
36 {
37 using R = std::ranges::elements_view<Range, 0>;
38 using Sentinel = std::ranges::sentinel_t<R>;
39
40 Sentinel s1(Sent{5});
41 assert(s1.base().i == 5);
42 }
43
44 return true;
45 }
46
main(int,char **)47 int main(int, char**) {
48 test();
49 static_assert(test());
50
51 return 0;
52 }
53