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> struct hash<optional<T>>;
13
14#include <experimental/optional>
15#include <string>
16#include <memory>
17#include <cassert>
18
19
20int main()
21{
22#if _LIBCPP_STD_VER > 11
23	using std::experimental::optional;
24
25    {
26        typedef int T;
27        optional<T> opt;
28        assert(std::hash<optional<T>>{}(opt) == 0);
29        opt = 2;
30        assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
31    }
32    {
33        typedef std::string T;
34        optional<T> opt;
35        assert(std::hash<optional<T>>{}(opt) == 0);
36        opt = std::string("123");
37        assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
38    }
39    {
40        typedef std::unique_ptr<int> T;
41        optional<T> opt;
42        assert(std::hash<optional<T>>{}(opt) == 0);
43        opt = std::unique_ptr<int>(new int(3));
44        assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
45    }
46#endif  // _LIBCPP_STD_VER > 11
47}
48