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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
| // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
struct non_trivial {
non_trivial();
non_trivial(const non_trivial&);
non_trivial& operator = (const non_trivial&);
~non_trivial();
};
union u {
non_trivial nt;
};
union u2 {
non_trivial nt;
int k;
u2(int k) : k(k) {}
u2() : nt() {}
};
union static_data_member {
static int i;
};
int static_data_member::i;
union bad {
int &i; // expected-error {{union member 'i' has reference type 'int &'}}
};
struct s {
union {
non_trivial nt;
};
};
// Don't crash on this.
struct TemplateCtor { template<typename T> TemplateCtor(T); };
union TemplateCtorMember { TemplateCtor s; };
template<typename T> struct remove_ref { typedef T type; };
template<typename T> struct remove_ref<T&> { typedef T type; };
template<typename T> struct remove_ref<T&&> { typedef T type; };
template<typename T> T &&forward(typename remove_ref<T>::type &&t);
template<typename T> T &&forward(typename remove_ref<T>::type &t);
template<typename T> typename remove_ref<T>::type &&move(T &&t);
using size_t = decltype(sizeof(int));
void *operator new(size_t, void *p) noexcept { return p; }
namespace disabled_dtor {
template<typename T>
union disable_dtor {
T val;
template<typename...U>
disable_dtor(U &&...u) : val(forward<U>(u)...) {}
~disable_dtor() {}
};
struct deleted_dtor {
deleted_dtor(int n, char c) : n(n), c(c) {}
int n;
char c;
~deleted_dtor() = delete;
};
disable_dtor<deleted_dtor> dd(4, 'x');
}
namespace optional {
template<typename T> struct optional {
bool has;
union { T value; };
optional() : has(false) {}
template<typename...U>
optional(U &&...u) : has(true), value(forward<U>(u)...) {}
optional(const optional &o) : has(o.has) {
if (has) new (&value) T(o.value);
}
optional(optional &&o) : has(o.has) {
if (has) new (&value) T(move(o.value));
}
optional &operator=(const optional &o) {
if (has) {
if (o.has)
value = o.value;
else
value.~T();
} else if (o.has) {
new (&value) T(o.value);
}
has = o.has;
}
optional &operator=(optional &&o) {
if (has) {
if (o.has)
value = move(o.value);
else
value.~T();
} else if (o.has) {
new (&value) T(move(o.value));
}
has = o.has;
}
~optional() {
if (has)
value.~T();
}
explicit operator bool() const { return has; }
T &operator*() { return value; }
};
optional<non_trivial> o1;
optional<non_trivial> o2{non_trivial()};
optional<non_trivial> o3{*o2};
void f() {
if (o2)
o1 = o2;
o2 = optional<non_trivial>();
}
}
namespace pr16061 {
struct X { X(); };
template<typename T> struct Test1 {
union {
struct {
X x;
};
};
};
template<typename T> struct Test2 {
union {
struct { // expected-note {{default constructor of 'Test2<pr16061::X>' is implicitly deleted because variant field '' has a non-trivial default constructor}}
T x;
};
};
};
Test2<X> t2x; // expected-error {{call to implicitly-deleted default constructor of 'Test2<pr16061::X>'}}
}
|