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 // <iterator>
12 
13 // move_sentinel
14 
15 // constexpr move_sentinel();
16 
17 #include <iterator>
18 #include <cassert>
19 
test()20 constexpr bool test()
21 {
22 
23   // The underlying sentinel is an integer.
24   {
25     std::move_sentinel<int> m;
26     assert(m.base() == 0);
27   }
28 
29   // The underlying sentinel is a pointer.
30   {
31     std::move_sentinel<int*> m;
32     assert(m.base() == nullptr);
33   }
34 
35   // The underlying sentinel is a user-defined type with an explicit default constructor.
36   {
37     struct S {
38       explicit S() = default;
39       int i = 3;
40     };
41     std::move_sentinel<S> m;
42     assert(m.base().i == 3);
43   }
44 
45   return true;
46 }
47 
main(int,char **)48 int main(int, char**)
49 {
50   test();
51   static_assert(test());
52 
53   return 0;
54 }
55