1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14
10 // <optional>
11 
12 // constexpr const T* optional<T>::operator->() const;
13 
14 #include <optional>
15 #include <type_traits>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 using std::optional;
21 
22 struct X
23 {
24     constexpr int test() const {return 3;}
25 };
26 
27 struct Y
28 {
29     int test() const noexcept {return 2;}
30 };
31 
32 struct Z
33 {
34     const Z* operator&() const;
35     constexpr int test() const {return 1;}
36 };
37 
38 int main(int, char**)
39 {
40     {
41         const std::optional<X> opt; ((void)opt);
42         ASSERT_SAME_TYPE(decltype(opt.operator->()), X const*);
43         ASSERT_NOEXCEPT(opt.operator->());
44     }
45     {
46         constexpr optional<X> opt(X{});
47         static_assert(opt->test() == 3, "");
48     }
49     {
50         constexpr optional<Y> opt(Y{});
51         assert(opt->test() == 2);
52     }
53     {
54         constexpr optional<Z> opt(Z{});
55         static_assert(opt->test() == 1, "");
56     }
57 
58     return 0;
59 }
60