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1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 
3 void abort() __attribute__((noreturn));
4 
5 class Okay {
6   int a_;
7 };
8 
9 class Virtual {
foo()10   virtual void foo() { abort(); } // expected-note 4 {{because type 'Virtual' has a virtual member function}}
11 };
12 
13 class VirtualBase : virtual Okay { // expected-note 4 {{because type 'VirtualBase' has a virtual base class}}
14 };
15 
16 class Ctor {
Ctor()17   Ctor() { abort(); } // expected-note 2{{because type 'Ctor' has a user-provided default constructor}} expected-note 2{{here}}
18 };
19 class Ctor2 {
20   Ctor2(); // expected-note {{because type 'Ctor2' has a user-provided default constructor}} expected-note 2{{here}}
21 };
22 class CtorTmpl { // expected-note {{because type 'CtorTmpl' has no default constructor}}
23   template<typename T> CtorTmpl(); // expected-note {{implicit default constructor suppressed by user-declared constructor}}
24 };
25 
26 class CopyCtor { // expected-note 2{{because no constructor can be used to copy an object of type 'const CopyCtor'}}
CopyCtor(CopyCtor & cc)27   CopyCtor(CopyCtor &cc) { abort(); }
28 };
29 
30 class CopyAssign { // expected-note 2 {{because no assignment operator can be used to copy an object of type 'const CopyAssign'}}
operator =(CopyAssign & CA)31   CopyAssign& operator=(CopyAssign& CA) { abort(); }
32 };
33 
34 class Dtor {
~Dtor()35   ~Dtor() { abort(); } // expected-note 2 {{because type 'Dtor' has a user-provided destructor}} expected-note 2{{here}}
36 };
37 
38 union U1 {
39   Virtual v; // expected-error {{union member 'v' has a non-trivial copy constructor}}
40   VirtualBase vbase; // expected-error {{union member 'vbase' has a non-trivial copy constructor}}
41   Ctor ctor; // expected-error {{union member 'ctor' has a non-trivial constructor}}
42   Ctor2 ctor2; // expected-error {{union member 'ctor2' has a non-trivial constructor}}
43   CtorTmpl ctortmpl; // expected-error {{union member 'ctortmpl' has a non-trivial constructor}}
44   CopyCtor copyctor; // expected-error {{union member 'copyctor' has a non-trivial copy constructor}}
45   CopyAssign copyassign; // expected-error {{union member 'copyassign' has a non-trivial copy assignment operator}}
46   Dtor dtor; // expected-error {{union member 'dtor' has a non-trivial destructor}}
47   Okay okay;
48 };
49 
50 union U2 {
51   struct {
52     Virtual v; // expected-note {{because the function selected to copy field of type 'Virtual' is not trivial}}
53   } m1; // expected-error {{union member 'm1' has a non-trivial copy constructor}}
54   struct {
55     VirtualBase vbase; // expected-note {{because the function selected to copy field of type 'VirtualBase' is not trivial}}
56   } m2; // expected-error {{union member 'm2' has a non-trivial copy constructor}}
57   struct {
58     Ctor ctor; // expected-note {{because field of type 'Ctor' has a user-provided default constructor}}
59   } m3; // expected-error {{union member 'm3' has a non-trivial constructor}}
60   struct {
61     Ctor2 ctor2; // expected-note {{because field of type 'Ctor2' has a user-provided default constructor}}
62   } m3a; // expected-error {{union member 'm3a' has a non-trivial constructor}}
63   struct { // expected-note {{no constructor can be used to copy an object of type 'const}}
64     CopyCtor copyctor;
65   } m4; // expected-error {{union member 'm4' has a non-trivial copy constructor}}
66   struct { // expected-note {{no assignment operator can be used to copy an object of type 'const}}
67     CopyAssign copyassign;
68   } m5; // expected-error {{union member 'm5' has a non-trivial copy assignment operator}}
69   struct {
70     Dtor dtor; // expected-note {{because field of type 'Dtor' has a user-provided destructor}}
71   } m6; // expected-error {{union member 'm6' has a non-trivial destructor}}
72   struct {
73     Okay okay;
74   } m7;
75 };
76 
77 union U3 {
78   struct s1 : Virtual { // expected-note {{because the function selected to copy base class of type 'Virtual' is not trivial}}
79   } m1; // expected-error {{union member 'm1' has a non-trivial copy constructor}}
80   struct s2 : VirtualBase { // expected-note {{because the function selected to copy base class of type 'VirtualBase' is not trivial}}
81   } m2; // expected-error {{union member 'm2' has a non-trivial copy constructor}}
82   struct s3 : Ctor { // expected-note {{because base class of type 'Ctor' has a user-provided default constructor}}
83   } m3; // expected-error {{union member 'm3' has a non-trivial constructor}}
84   struct s3a : Ctor2 { // expected-note {{because base class of type 'Ctor2' has a user-provided default constructor}}
85   } m3a; // expected-error {{union member 'm3a' has a non-trivial constructor}}
86   struct s4 : CopyCtor { // expected-note {{because no constructor can be used to copy an object of type 'const U3::s4'}}
87   } m4; // expected-error {{union member 'm4' has a non-trivial copy constructor}}
88   struct s5 : CopyAssign { // expected-note {{because no assignment operator can be used to copy an object of type 'const U3::s5'}}
89   } m5; // expected-error {{union member 'm5' has a non-trivial copy assignment operator}}
90   struct s6 : Dtor { // expected-note {{because base class of type 'Dtor' has a user-provided destructor}}
91   } m6; // expected-error {{union member 'm6' has a non-trivial destructor}}
92   struct s7 : Okay {
93   } m7;
94   struct s8 {
95     s8(...) = delete; // expected-note {{because it is a variadic function}} expected-warning {{C++11}}
96   } m8; // expected-error {{union member 'm8' has a non-trivial constructor}}
97 };
98 
99 union U4 {
100   static int i1; // expected-warning {{static data member 'i1' in union is a C++11 extension}}
101 };
102 int U4::i1 = 10;
103 
104 union U5 {
105   int& i1; // expected-error {{union member 'i1' has reference type 'int &'}}
106 };
107 
108 union U6 {
109   struct S {
110     int &i;
111   } s; // ok
112 };
113 
114 template <class A, class B> struct Either {
115   bool tag;
116   union { // expected-note 6 {{in instantiation of member class}}
117     A a;
118     B b; // expected-error 6 {{non-trivial}}
119   };
120 
EitherEither121   Either(const A& a) : tag(true), a(a) {}
EitherEither122   Either(const B& b) : tag(false), b(b) {}
123 };
124 
fred()125 void fred() {
126   Either<int,Virtual> virt(0); // expected-note {{in instantiation of template}}
127   Either<int,VirtualBase> vbase(0); // expected-note {{in instantiation of template}}
128   Either<int,Ctor> ctor(0); // expected-note {{in instantiation of template}}
129   Either<int,CopyCtor> copyctor(0); // expected-note {{in instantiation of template}}
130   Either<int,CopyAssign> copyassign(0); // expected-note {{in instantiation of template}}
131   Either<int,Dtor> dtor(0); // expected-note {{in instantiation of template}}
132   Either<int,Okay> okay(0);
133 }
134