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>::value() const &; |
13 | |
14 | #include <optional> |
15 | #include <type_traits> |
16 | #include <cassert> |
17 | |
18 | using std::optional; |
19 | |
20 | struct X |
21 | { |
22 | constexpr int test() const {return 3;} |
23 | int test() {return 4;} |
24 | }; |
25 | |
26 | int main(int, char**) |
27 | { |
28 | { |
29 | constexpr optional<X> opt; |
30 | static_assert(opt.value().test() == 3, "" ); |
31 | } |
32 | |
33 | return 0; |
34 | } |
35 | |