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 
11 // Throwing bad_optional_access is supported starting in macosx10.13
12 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
13 
14 // <optional>
15 //
16 // template <class T>
17 //   constexpr optional<decay_t<T>> make_optional(T&& v);
18 
19 #include <optional>
20 #include <string>
21 #include <memory>
22 #include <cassert>
23 
24 #include "test_macros.h"
25 
26 int main(int, char**)
27 {
28     using std::optional;
29     using std::make_optional;
30     {
31         int arr[10]; ((void)arr);
32         ASSERT_SAME_TYPE(decltype(make_optional(arr)), optional<int*>);
33     }
34     {
35         constexpr auto opt = make_optional(2);
36         ASSERT_SAME_TYPE(decltype(opt), const optional<int>);
37         static_assert(opt.value() == 2);
38     }
39     {
40         optional<int> opt = make_optional(2);
41         assert(*opt == 2);
42     }
43     {
44         std::string s("123");
45         optional<std::string> opt = make_optional(s);
46         assert(*opt == s);
47     }
48     {
49         std::unique_ptr<int> s(new int(3));
50         optional<std::unique_ptr<int>> opt = make_optional(std::move(s));
51         assert(**opt == 3);
52         assert(s == nullptr);
53     }
54 
55   return 0;
56 }
57