| 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, c++17, c++20, c++23 |
| 10 | // XFAIL: apple-clang |
| 11 | |
| 12 | // <variant> |
| 13 | |
| 14 | // class variant; |
| 15 | // template<class Self, class Visitor> |
| 16 | // constexpr decltype(auto) visit(this Self&&, Visitor&&); // since C++26 |
| 17 | // template<class R, class Self, class Visitor> |
| 18 | // constexpr R visit(this Self&&, Visitor&&); // since C++26 |
| 19 | |
| 20 | #include <variant> |
| 21 | |
| 22 | #include "test_macros.h" |
| 23 | |
| 24 | struct Incomplete; |
| 25 | template <class T> |
| 26 | struct Holder { |
| 27 | T t; |
| 28 | }; |
| 29 | |
| 30 | constexpr bool test(bool do_it) { |
| 31 | if (do_it) { |
| 32 | std::variant<Holder<Incomplete>*, int> v = nullptr; |
| 33 | |
| 34 | v.visit([](auto) {}); |
| 35 | v.visit([](auto) -> Holder<Incomplete>* { return nullptr; }); |
| 36 | v.visit<void>([](auto) {}); |
| 37 | v.visit<void*>([](auto) -> Holder<Incomplete>* { return nullptr; }); |
| 38 | } |
| 39 | return true; |
| 40 | } |
| 41 | |
| 42 | int main(int, char**) { |
| 43 | test(do_it: true); |
| 44 | static_assert(test(true)); |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |