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 T& optional<T>::operator*() &;
13
14#include <optional>
15#include <type_traits>
16#include <cassert>
17
18#include "test_macros.h"
19
20using std::optional;
21
22struct X
23{
24 constexpr int test() const& {return 3;}
25 int test() & {return 4;}
26 constexpr int test() const&& {return 5;}
27 int test() && {return 6;}
28};
29
30struct Y
31{
32 constexpr int test() {return 7;}
33};
34
35constexpr int
36test()
37{
38 optional<Y> opt{Y{}};
39 return (*opt).test();
40}
41
42int main(int, char**)
43{
44 {
45 optional<X> opt; ((void)opt);
46 ASSERT_SAME_TYPE(decltype(*opt), X&);
47 ASSERT_NOEXCEPT(*opt);
48 }
49 {
50 optional<X> opt(X{});
51 assert((*opt).test() == 4);
52 }
53 static_assert(test() == 7, "");
54
55 return 0;
56}
57

source code of libcxx/test/std/utilities/optional/optional.object/optional.object.observe/dereference.pass.cpp