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*() const &&;
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 int test() const && {return 2;}
33};
34
35int main(int, char**)
36{
37 {
38 const optional<X> opt; ((void)opt);
39 ASSERT_SAME_TYPE(decltype(*std::move(opt)), X const &&);
40 ASSERT_NOEXCEPT(*std::move(opt));
41 }
42 {
43 constexpr optional<X> opt(X{});
44 static_assert((*std::move(opt)).test() == 5, "");
45 }
46 {
47 constexpr optional<Y> opt(Y{});
48 assert((*std::move(opt)).test() == 2);
49 }
50
51 return 0;
52}
53

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