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
10 // <optional>
11 
12 // ~optional();
13 
14 #include <optional>
15 #include <type_traits>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 using std::optional;
21 
22 struct PODType {
23   int value;
24   int value2;
25 };
26 
27 class X
28 {
29 public:
30     static bool dtor_called;
31     X() = default;
32     ~X() {dtor_called = true;}
33 };
34 
35 bool X::dtor_called = false;
36 
37 int main(int, char**)
38 {
39     {
40         typedef int T;
41         static_assert(std::is_trivially_destructible<T>::value, "");
42         static_assert(std::is_trivially_destructible<optional<T>>::value, "");
43     }
44     {
45         typedef double T;
46         static_assert(std::is_trivially_destructible<T>::value, "");
47         static_assert(std::is_trivially_destructible<optional<T>>::value, "");
48     }
49     {
50         typedef PODType T;
51         static_assert(std::is_trivially_destructible<T>::value, "");
52         static_assert(std::is_trivially_destructible<optional<T>>::value, "");
53     }
54     {
55         typedef X T;
56         static_assert(!std::is_trivially_destructible<T>::value, "");
57         static_assert(!std::is_trivially_destructible<optional<T>>::value, "");
58         {
59             X x;
60             optional<X> opt{x};
61             assert(X::dtor_called == false);
62         }
63         assert(X::dtor_called == true);
64     }
65 
66   return 0;
67 }
68