hash.pass.cpp revision 01afa5c6e407e985d9643707d7b7ab1384bd9317 
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 <optional>
15#include <string>
16#include <memory>
17#include <cassert>
18
19#if _LIBCPP_STD_VER > 11
20
21#endif  // _LIBCPP_STD_VER > 11
22
23int main()
24{
25#if _LIBCPP_STD_VER > 11
26    {
27        typedef int T;
28        std::optional<T> opt;
29        assert(std::hash<std::optional<T>>{}(opt) == 0);
30        opt = 2;
31        assert(std::hash<std::optional<T>>{}(opt) == std::hash<T>{}(*opt));
32    }
33    {
34        typedef std::string T;
35        std::optional<T> opt;
36        assert(std::hash<std::optional<T>>{}(opt) == 0);
37        opt = std::string("123");
38        assert(std::hash<std::optional<T>>{}(opt) == std::hash<T>{}(*opt));
39    }
40    {
41        typedef std::unique_ptr<int> T;
42        std::optional<T> opt;
43        assert(std::hash<std::optional<T>>{}(opt) == 0);
44        opt = std::unique_ptr<int>(new int(3));
45        assert(std::hash<std::optional<T>>{}(opt) == std::hash<T>{}(*opt));
46    }
47#endif  // _LIBCPP_STD_VER > 11
48}
49