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
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, 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 {
static int count;
NonTDtor() = default;
~NonTDtor() { ++count; }
};
int NonTDtor::count = 0;
static_assert(!std::is_trivially_destructible<NonTDtor>::value, "");
struct NonTDtor1 {
static int count;
NonTDtor1() = default;
~NonTDtor1() { ++count; }
};
int NonTDtor1::count = 0;
static_assert(!std::is_trivially_destructible<NonTDtor1>::value, "");
struct TDtor {
TDtor(const TDtor &) {} // non-trivial copy
~TDtor() = default;
};
static_assert(!std::is_trivially_copy_constructible<TDtor>::value, "");
static_assert(std::is_trivially_destructible<TDtor>::value, "");
int main() {
{
using V = std::variant<int, long, TDtor>;
static_assert(std::is_trivially_destructible<V>::value, "");
}
{
using V = std::variant<NonTDtor, int, NonTDtor1>;
static_assert(!std::is_trivially_destructible<V>::value, "");
{
V v(std::in_place_index<0>);
assert(NonTDtor::count == 0);
assert(NonTDtor1::count == 0);
}
assert(NonTDtor::count == 1);
assert(NonTDtor1::count == 0);
NonTDtor::count = 0;
{ V v(std::in_place_index<1>); }
assert(NonTDtor::count == 0);
assert(NonTDtor1::count == 0);
{
V v(std::in_place_index<2>);
assert(NonTDtor::count == 0);
assert(NonTDtor1::count == 0);
}
assert(NonTDtor::count == 0);
assert(NonTDtor1::count == 1);
}
}
|
