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
23struct NonTDtor {
24 int* count;
25 constexpr NonTDtor(int* a, int*) : count(a) {}
26 TEST_CONSTEXPR_CXX20 ~NonTDtor() { ++*count; }
27};
28static_assert(!std::is_trivially_destructible<NonTDtor>::value, "");
29
30struct NonTDtor1 {
31 int* count;
32 constexpr NonTDtor1(int*, int* b) : count(b) {}
33 TEST_CONSTEXPR_CXX20 ~NonTDtor1() { ++*count; }
34};
35static_assert(!std::is_trivially_destructible<NonTDtor1>::value, "");
36
37struct TDtor {
38 constexpr TDtor() = default;
39 constexpr TDtor(const TDtor&) {} // non-trivial copy
40 TEST_CONSTEXPR_CXX20 ~TDtor() = default;
41};
42static_assert(!std::is_trivially_copy_constructible<TDtor>::value, "");
43static_assert(std::is_trivially_destructible<TDtor>::value, "");
44
45TEST_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
88int main(int, char**) {
89 test();
90
91#if TEST_STD_VER >= 20
92 static_assert(test());
93#endif
94
95 return 0;
96}
97

source code of libcxx/test/std/utilities/variant/variant.variant/variant.dtor/dtor.pass.cpp