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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
//===----------------------------------------------------------------------===//
//
// 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
// <variant>
// template <class ...Types> class variant;
// ~variant();
#include <cassert>
#include <type_traits>
#include <variant>
#include "test_macros.h"
struct NonTDtor {
int* count;
constexpr NonTDtor(int* a, int*) : count(a) {}
TEST_CONSTEXPR_CXX20 ~NonTDtor() { ++*count; }
};
static_assert(!std::is_trivially_destructible<NonTDtor>::value, "");
struct NonTDtor1 {
int* count;
constexpr NonTDtor1(int*, int* b) : count(b) {}
TEST_CONSTEXPR_CXX20 ~NonTDtor1() { ++*count; }
};
static_assert(!std::is_trivially_destructible<NonTDtor1>::value, "");
struct TDtor {
constexpr TDtor() = default;
constexpr TDtor(const TDtor&) {} // non-trivial copy
TEST_CONSTEXPR_CXX20 ~TDtor() = default;
};
static_assert(!std::is_trivially_copy_constructible<TDtor>::value, "");
static_assert(std::is_trivially_destructible<TDtor>::value, "");
TEST_CONSTEXPR_CXX20 bool test() {
{
using V = std::variant<int, long, TDtor>;
static_assert(std::is_trivially_destructible<V>::value, "");
[[maybe_unused]] V v(std::in_place_index<2>);
}
{
using V = std::variant<NonTDtor, int, NonTDtor1>;
static_assert(!std::is_trivially_destructible<V>::value, "");
{
int count0 = 0;
int count1 = 0;
{
V v(std::in_place_index<0>, &count0, &count1);
assert(count0 == 0);
assert(count1 == 0);
}
assert(count0 == 1);
assert(count1 == 0);
}
{
int count0 = 0;
int count1 = 0;
{ V v(std::in_place_index<1>); }
assert(count0 == 0);
assert(count1 == 0);
}
{
int count0 = 0;
int count1 = 0;
{
V v(std::in_place_index<2>, &count0, &count1);
assert(count0 == 0);
assert(count1 == 0);
}
assert(count0 == 0);
assert(count1 == 1);
}
}
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
return 0;
}
|
