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++98, c++03, c++11, c++14
10 // XFAIL: dylib-has-no-bad_optional_access && !no-exceptions
11 
12 // <optional>
13 //
14 // template <class T>
15 //   constexpr optional<decay_t<T>> make_optional(T&& v);
16 
17 #include <optional>
18 #include <string>
19 #include <memory>
20 #include <cassert>
21 
22 #include "test_macros.h"
23 
24 int main(int, char**)
25 {
26     using std::optional;
27     using std::make_optional;
28     {
29         int arr[10]; ((void)arr);
30         ASSERT_SAME_TYPE(decltype(make_optional(arr)), optional<int*>);
31     }
32     {
33         constexpr auto opt = make_optional(2);
34         ASSERT_SAME_TYPE(decltype(opt), const optional<int>);
35         static_assert(opt.value() == 2);
36     }
37     {
38         optional<int> opt = make_optional(2);
39         assert(*opt == 2);
40     }
41     {
42         std::string s("123");
43         optional<std::string> opt = make_optional(s);
44         assert(*opt == s);
45     }
46     {
47         std::unique_ptr<int> s(new int(3));
48         optional<std::unique_ptr<int>> opt = make_optional(std::move(s));
49         assert(**opt == 3);
50         assert(s == nullptr);
51     }
52 
53   return 0;
54 }
55