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 && x86_64-apple-macosx10.12 && !no-exceptions
13 // XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.11 && !no-exceptions
14 // XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.10 && !no-exceptions
15 // XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.9 && !no-exceptions
16 
17 // <optional>
18 //
19 // template <class T>
20 //   constexpr optional<decay_t<T>> make_optional(T&& v);
21 
22 #include <optional>
23 #include <string>
24 #include <memory>
25 #include <cassert>
26 
27 #include "test_macros.h"
28 
29 int main(int, char**)
30 {
31     using std::optional;
32     using std::make_optional;
33     {
34         int arr[10]; ((void)arr);
35         ASSERT_SAME_TYPE(decltype(make_optional(arr)), optional<int*>);
36     }
37     {
38         constexpr auto opt = make_optional(2);
39         ASSERT_SAME_TYPE(decltype(opt), const optional<int>);
40         static_assert(opt.value() == 2);
41     }
42     {
43         optional<int> opt = make_optional(2);
44         assert(*opt == 2);
45     }
46     {
47         std::string s("123");
48         optional<std::string> opt = make_optional(s);
49         assert(*opt == s);
50     }
51     {
52         std::unique_ptr<int> s(new int(3));
53         optional<std::unique_ptr<int>> opt = make_optional(std::move(s));
54         assert(**opt == 3);
55         assert(s == nullptr);
56     }
57 
58   return 0;
59 }
60