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 | |
11 | // <variant> |
12 | // template <class Visitor, class... Variants> |
13 | // constexpr see below visit(Visitor&& vis, Variants&&... vars); |
14 | |
15 | #include <variant> |
16 | |
17 | #include "test_macros.h" |
18 | |
19 | struct Incomplete; |
20 | template<class T> struct Holder { T t; }; |
21 | |
22 | constexpr bool test(bool do_it) |
23 | { |
24 | if (do_it) { |
25 | std::variant<Holder<Incomplete>*, int> v = nullptr; |
26 | std::visit([](auto){}, v); |
27 | std::visit([](auto) -> Holder<Incomplete>* { return nullptr; }, v); |
28 | #if TEST_STD_VER > 17 |
29 | std::visit<void>([](auto){}, v); |
30 | std::visit<void*>([](auto) -> Holder<Incomplete>* { return nullptr; }, v); |
31 | #endif |
32 | } |
33 | return true; |
34 | } |
35 | |
36 | int main(int, char**) |
37 | { |
38 | test(do_it: true); |
39 | #if TEST_STD_VER > 17 |
40 | static_assert(test(true)); |
41 | #endif |
42 | return 0; |
43 | } |
44 | |