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 explicit move_sentinel(S s);
16 
17 #include <iterator>
18 #include <cassert>
19 
test()20 constexpr bool test()
21 {
22   // The underlying sentinel is an integer.
23   {
24     static_assert(!std::is_convertible_v<int, std::move_sentinel<int>>);
25     std::move_sentinel<int> m(42);
26     assert(m.base() == 42);
27   }
28 
29   // The underlying sentinel is a pointer.
30   {
31     static_assert(!std::is_convertible_v<int*, std::move_sentinel<int*>>);
32     int i = 42;
33     std::move_sentinel<int*> m(&i);
34     assert(m.base() == &i);
35   }
36 
37   // The underlying sentinel is a user-defined type with an explicit default constructor.
38   {
39     struct S {
40       explicit S() = default;
41       constexpr explicit S(int j) : i(j) {}
42       int i = 3;
43     };
44     static_assert(!std::is_convertible_v<S, std::move_sentinel<S>>);
45     std::move_sentinel<S> m(S(42));
46     assert(m.base().i == 42);
47   }
48   return true;
49 }
50 
main(int,char **)51 int main(int, char**)
52 {
53   test();
54   static_assert(test());
55 
56   return 0;
57 }
58