1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <optional>
11
12// template <class T>
13//   constexpr
14//   optional<typename decay<T>::type>
15//   make_optional(T&& v);
16
17#include <experimental/optional>
18#include <string>
19#include <memory>
20#include <cassert>
21
22int main()
23{
24#if _LIBCPP_STD_VER > 11
25    using std::experimental::optional;
26    using std::experimental::make_optional;
27
28    {
29        optional<int> opt = make_optional(2);
30        assert(*opt == 2);
31    }
32    {
33        std::string s("123");
34        optional<std::string> opt = make_optional(s);
35        assert(*opt == s);
36    }
37    {
38        std::string s("123");
39        optional<std::string> opt = make_optional(std::move(s));
40        assert(*opt == "123");
41        assert(s.empty());
42    }
43    {
44        std::unique_ptr<int> s(new int(3));
45        optional<std::unique_ptr<int>> opt = make_optional(std::move(s));
46        assert(**opt == 3);
47        assert(s == nullptr);
48    }
49#endif  // _LIBCPP_STD_VER > 11
50}
51