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 T* optional<T>::operator->();
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 #endif  // _LIBCPP_STD_VER > 11
32 
main()33 int main()
34 {
35 #if _LIBCPP_STD_VER > 11
36     {
37         constexpr optional<X> opt(X{});
38         static_assert(opt->test() == 3, "");
39     }
40 #ifdef _LIBCPP_DEBUG
41     {
42         optional<X> opt;
43         assert(opt->test() == 3);
44         assert(false);
45     }
46 #endif  // _LIBCPP_DEBUG
47 #endif  // _LIBCPP_STD_VER > 11
48 }
49