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
13 // template <class ...Types> class variant;
14
15 // ~variant();
16
17 #include <cassert>
18 #include <type_traits>
19 #include <variant>
20
21 #include "test_macros.h"
22
23 struct NonTDtor {
24 int* count;
NonTDtorNonTDtor25 constexpr NonTDtor(int* a, int*) : count(a) {}
~NonTDtorNonTDtor26 TEST_CONSTEXPR_CXX20 ~NonTDtor() { ++*count; }
27 };
28 static_assert(!std::is_trivially_destructible<NonTDtor>::value, "");
29
30 struct NonTDtor1 {
31 int* count;
NonTDtor1NonTDtor132 constexpr NonTDtor1(int*, int* b) : count(b) {}
~NonTDtor1NonTDtor133 TEST_CONSTEXPR_CXX20 ~NonTDtor1() { ++*count; }
34 };
35 static_assert(!std::is_trivially_destructible<NonTDtor1>::value, "");
36
37 struct TDtor {
38 constexpr TDtor() = default;
TDtorTDtor39 constexpr TDtor(const TDtor&) {} // non-trivial copy
40 TEST_CONSTEXPR_CXX20 ~TDtor() = default;
41 };
42 static_assert(!std::is_trivially_copy_constructible<TDtor>::value, "");
43 static_assert(std::is_trivially_destructible<TDtor>::value, "");
44
test()45 TEST_CONSTEXPR_CXX20 bool test() {
46 {
47 using V = std::variant<int, long, TDtor>;
48 static_assert(std::is_trivially_destructible<V>::value, "");
49 [[maybe_unused]] V v(std::in_place_index<2>);
50 }
51 {
52 using V = std::variant<NonTDtor, int, NonTDtor1>;
53 static_assert(!std::is_trivially_destructible<V>::value, "");
54 {
55 int count0 = 0;
56 int count1 = 0;
57 {
58 V v(std::in_place_index<0>, &count0, &count1);
59 assert(count0 == 0);
60 assert(count1 == 0);
61 }
62 assert(count0 == 1);
63 assert(count1 == 0);
64 }
65 {
66 int count0 = 0;
67 int count1 = 0;
68 { V v(std::in_place_index<1>); }
69 assert(count0 == 0);
70 assert(count1 == 0);
71 }
72 {
73 int count0 = 0;
74 int count1 = 0;
75 {
76 V v(std::in_place_index<2>, &count0, &count1);
77 assert(count0 == 0);
78 assert(count1 == 0);
79 }
80 assert(count0 == 0);
81 assert(count1 == 1);
82 }
83 }
84
85 return true;
86 }
87
main(int,char **)88 int main(int, char**) {
89 test();
90
91 #if TEST_STD_VER >= 20
92 static_assert(test());
93 #endif
94
95 return 0;
96 }
97