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// constexpr const T& optional<T>::operator*() const;
13
14#ifdef _LIBCPP_DEBUG
15#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
16#endif
17
18#include <experimental/optional>
19#include <type_traits>
20#include <cassert>
21
22#if _LIBCPP_STD_VER > 11
23
24using std::experimental::optional;
25
26struct X
27{
28    constexpr int test() const {return 3;}
29};
30
31struct Y
32{
33    int test() const {return 2;}
34};
35
36#endif  // _LIBCPP_STD_VER > 11
37
38int main()
39{
40#if _LIBCPP_STD_VER > 11
41    {
42        constexpr optional<X> opt(X{});
43        static_assert((*opt).test() == 3, "");
44    }
45    {
46        constexpr optional<Y> opt(Y{});
47        assert((*opt).test() == 2);
48    }
49#ifdef _LIBCPP_DEBUG
50    {
51        const optional<X> opt;
52        assert((*opt).test() == 3);
53        assert(false);
54    }
55#endif  // _LIBCPP_DEBUG
56#endif  // _LIBCPP_STD_VER > 11
57}
58