| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23 |
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| 10 | // The tested functionality needs deducing this. |
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| 11 | // UNSUPPORTED: clang-17 |
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| 12 | // XFAIL: apple-clang |
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| 13 | |
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| 14 | // <variant> |
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| 15 | |
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| 16 | // class variant; |
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| 17 | // template<class Self, class Visitor> |
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| 18 | // constexpr decltype(auto) visit(this Self&&, Visitor&&); // since C++26 |
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| 19 | // template<class R, class Self, class Visitor> |
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| 20 | // constexpr R visit(this Self&&, Visitor&&); // since C++26 |
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| 21 | |
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| 22 | #include <variant> |
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| 23 | |
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| 24 | #include "test_macros.h" |
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| 25 | |
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| 26 | struct Incomplete; |
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| 27 | template <class T> |
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| 28 | struct Holder { |
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| 29 | T t; |
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| 30 | }; |
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| 31 | |
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| 32 | constexpr bool test(bool do_it) { |
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| 33 | if (do_it) { |
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| 34 | std::variant<Holder<Incomplete>*, int> v = nullptr; |
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| 35 | |
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| 36 | v.visit([](auto) {}); |
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| 37 | v.visit([](auto) -> Holder<Incomplete>* { return nullptr; }); |
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| 38 | v.visit<void>([](auto) {}); |
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| 39 | v.visit<void*>([](auto) -> Holder<Incomplete>* { return nullptr; }); |
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| 40 | } |
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| 41 | return true; |
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| 42 | } |
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| 43 | |
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| 44 | int main(int, char**) { |
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| 45 | test(do_it: true); |
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| 46 | static_assert(test(true)); |
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| 47 | |
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| 48 | return 0; |
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| 49 | } |
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| 50 | |
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