| 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 | |
| 20 | using std::optional; |
| 21 | |
| 22 | struct 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 | |
| 30 | struct Y |
| 31 | { |
| 32 | constexpr int test() {return 7;} |
| 33 | }; |
| 34 | |
| 35 | constexpr int |
| 36 | test() |
| 37 | { |
| 38 | optional<Y> opt{Y{}}; |
| 39 | return (*opt).test(); |
| 40 | } |
| 41 | |
| 42 | int 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 | |