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