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 
24 using std::experimental::optional;
25 
26 struct X
27 {
testX28     constexpr int test() const {return 3;}
29 };
30 
31 struct Y
32 {
testY33     int test() const {return 2;}
34 };
35 
36 struct Z
37 {
operator &Z38     const Z* operator&() const {return this;}
testZ39     constexpr int test() const {return 1;}
40 };
41 
42 #endif  // _LIBCPP_STD_VER > 11
43 
main()44 int main()
45 {
46 #if _LIBCPP_STD_VER > 11
47     {
48         constexpr optional<X> opt(X{});
49         static_assert(opt->test() == 3, "");
50     }
51     {
52         constexpr optional<Y> opt(Y{});
53         assert(opt->test() == 2);
54     }
55     {
56         constexpr optional<Z> opt(Z{});
57         assert(opt->test() == 1);
58     }
59 #ifdef _LIBCPP_DEBUG
60     {
61         const optional<X> opt;
62         assert(opt->test() == 3);
63         assert(false);
64     }
65 #endif  // _LIBCPP_DEBUG
66 #endif  // _LIBCPP_STD_VER > 11
67 }
68