implicit-move.cpp revision e6af6604b905435456f49cd4a37da0ce6e505c38 
1// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
2
3// Tests for implicit (non-)declaration of move constructor and
4// assignment: p9, p11, p20, p23.
5
6// This class, used as a member, allows to distinguish move from copy because
7// move operations are no-throw, copy operations aren't.
8struct ThrowingCopy {
9  ThrowingCopy() noexcept;
10  ThrowingCopy(ThrowingCopy &&) noexcept;
11  ThrowingCopy(const ThrowingCopy &) noexcept(false);
12  ThrowingCopy & operator =(ThrowingCopy &&) noexcept;
13  ThrowingCopy & operator =(const ThrowingCopy &) noexcept(false);
14};
15
16struct HasCopyConstructor {
17  ThrowingCopy tc;
18  HasCopyConstructor() noexcept;
19  HasCopyConstructor(const HasCopyConstructor &) noexcept(false);
20};
21
22struct HasCopyAssignment {
23  ThrowingCopy tc;
24  HasCopyAssignment() noexcept;
25  HasCopyAssignment & operator =(const HasCopyAssignment &) noexcept(false);
26};
27
28struct HasMoveConstructor {
29  ThrowingCopy tc;
30  HasMoveConstructor() noexcept;
31  HasMoveConstructor(HasMoveConstructor &&) noexcept; // expected-note {{copy assignment operator is implicitly deleted because 'HasMoveConstructor' has a user-declared move constructor}}
32};
33
34struct HasMoveAssignment { // expected-note {{implicit copy constructor}}
35  ThrowingCopy tc;
36  HasMoveAssignment() noexcept;
37  HasMoveAssignment & operator =(HasMoveAssignment &&) noexcept;
38};
39
40struct HasDestructor {
41  ThrowingCopy tc;
42  HasDestructor() noexcept;
43  ~HasDestructor() noexcept;
44};
45
46void test_basic_exclusion() {
47  static_assert(!noexcept(HasCopyConstructor((HasCopyConstructor()))), "");
48  HasCopyConstructor hcc;
49  static_assert(!noexcept(hcc = HasCopyConstructor()), "");
50
51  static_assert(!noexcept(HasCopyAssignment((HasCopyAssignment()))), "");
52  HasCopyAssignment hca;
53  static_assert(!noexcept(hca = HasCopyAssignment()), "");
54
55  static_assert(noexcept(HasMoveConstructor((HasMoveConstructor()))), "");
56  HasMoveConstructor hmc;
57  hmc = HasMoveConstructor(); // expected-error {{selected implicitly-deleted copy assignment}}
58
59  (HasMoveAssignment(HasMoveAssignment())); // expected-error {{uses deleted function}}
60  HasMoveAssignment hma;
61  static_assert(noexcept(hma = HasMoveAssignment()), "");
62
63  static_assert(!noexcept(HasDestructor((HasDestructor()))), "");
64  HasDestructor hd;
65  static_assert(!noexcept(hd = HasDestructor()), "");
66}
67
68struct PrivateMove {
69  PrivateMove() noexcept;
70  PrivateMove(const PrivateMove &) noexcept(false);
71  PrivateMove & operator =(const PrivateMove &) noexcept(false);
72private:
73  PrivateMove(PrivateMove &&) noexcept;
74  PrivateMove & operator =(PrivateMove &&) noexcept;
75};
76
77struct InheritsPrivateMove : PrivateMove {};
78struct ContainsPrivateMove {
79  PrivateMove pm;
80};
81
82struct PrivateDestructor {
83  PrivateDestructor() noexcept;
84  PrivateDestructor(const PrivateDestructor &) noexcept(false);
85  PrivateDestructor(PrivateDestructor &&) noexcept;
86private:
87  ~PrivateDestructor() noexcept;
88};
89
90struct InheritsPrivateDestructor : PrivateDestructor {}; // expected-note{{base class 'PrivateDestructor' has an inaccessible destructor}}
91struct ContainsPrivateDestructor {
92  PrivateDestructor pd; // expected-note{{field 'pd' has an inaccessible destructor}}
93};
94
95struct NonTrivialCopyOnly {
96  NonTrivialCopyOnly() noexcept;
97  NonTrivialCopyOnly(const NonTrivialCopyOnly &) noexcept(false);
98  NonTrivialCopyOnly & operator =(const NonTrivialCopyOnly &) noexcept(false);
99};
100
101struct InheritsNonTrivialCopyOnly : NonTrivialCopyOnly {};
102struct ContainsNonTrivialCopyOnly {
103  NonTrivialCopyOnly ntco;
104};
105
106struct ContainsConst {
107  const int i;
108  ContainsConst() noexcept;
109  ContainsConst & operator =(ContainsConst &); // expected-note {{not viable}}
110};
111
112struct ContainsRef {
113  int &i;
114  ContainsRef() noexcept;
115  ContainsRef & operator =(ContainsRef &); // expected-note {{not viable}}
116};
117
118struct Base {
119  Base & operator =(Base &);
120};
121struct DirectVirtualBase : virtual Base {}; // expected-note {{copy assignment operator) not viable}}
122struct IndirectVirtualBase : DirectVirtualBase {}; // expected-note {{copy assignment operator) not viable}}
123
124void test_deletion_exclusion() {
125  // FIXME: How to test the union thing?
126
127  static_assert(!noexcept(InheritsPrivateMove(InheritsPrivateMove())), "");
128  static_assert(!noexcept(ContainsPrivateMove(ContainsPrivateMove())), "");
129  InheritsPrivateMove ipm;
130  static_assert(!noexcept(ipm = InheritsPrivateMove()), "");
131  ContainsPrivateMove cpm;
132  static_assert(!noexcept(cpm = ContainsPrivateMove()), "");
133
134  (InheritsPrivateDestructor(InheritsPrivateDestructor())); // expected-error {{call to implicitly-deleted default constructor}}
135  (ContainsPrivateDestructor(ContainsPrivateDestructor())); // expected-error {{call to implicitly-deleted default constructor}}
136
137  static_assert(!noexcept(InheritsNonTrivialCopyOnly(InheritsNonTrivialCopyOnly())), "");
138  static_assert(!noexcept(ContainsNonTrivialCopyOnly(ContainsNonTrivialCopyOnly())), "");
139  InheritsNonTrivialCopyOnly intco;
140  static_assert(!noexcept(intco = InheritsNonTrivialCopyOnly()), "");
141  ContainsNonTrivialCopyOnly cntco;
142  static_assert(!noexcept(cntco = ContainsNonTrivialCopyOnly()), "");
143
144  ContainsConst cc;
145  cc = ContainsConst(); // expected-error {{no viable}}
146
147  ContainsRef cr;
148  cr = ContainsRef(); // expected-error {{no viable}}
149
150  DirectVirtualBase dvb;
151  dvb = DirectVirtualBase(); // expected-error {{no viable}}
152
153  IndirectVirtualBase ivb;
154  ivb = IndirectVirtualBase(); // expected-error {{no viable}}
155}
156
157struct ContainsRValueRef {
158  int&& ri;
159  ContainsRValueRef() noexcept;
160};
161
162void test_contains_rref() {
163  (ContainsRValueRef(ContainsRValueRef()));
164}
165
166
167namespace DR1402 {
168  struct NonTrivialCopyCtor {
169    NonTrivialCopyCtor(const NonTrivialCopyCtor &);
170  };
171  struct NonTrivialCopyAssign {
172    NonTrivialCopyAssign &operator=(const NonTrivialCopyAssign &);
173  };
174
175  struct NonTrivialCopyCtorVBase : virtual NonTrivialCopyCtor {
176    NonTrivialCopyCtorVBase(NonTrivialCopyCtorVBase &&);
177    NonTrivialCopyCtorVBase &operator=(NonTrivialCopyCtorVBase &&) = default;
178  };
179  struct NonTrivialCopyAssignVBase : virtual NonTrivialCopyAssign {
180    NonTrivialCopyAssignVBase(NonTrivialCopyAssignVBase &&);
181    NonTrivialCopyAssignVBase &operator=(NonTrivialCopyAssignVBase &&) = default;
182  };
183
184  struct NonTrivialMoveAssign {
185    NonTrivialMoveAssign(NonTrivialMoveAssign&&);
186    NonTrivialMoveAssign &operator=(NonTrivialMoveAssign &&);
187  };
188  struct NonTrivialMoveAssignVBase : virtual NonTrivialMoveAssign {
189    NonTrivialMoveAssignVBase(NonTrivialMoveAssignVBase &&);
190    NonTrivialMoveAssignVBase &operator=(NonTrivialMoveAssignVBase &&) = default;
191  };
192
193  // A non-movable, non-trivially-copyable class type as a subobject inhibits
194  // the declaration of a move operation.
195  struct NoMove1 { NonTrivialCopyCtor ntcc; }; // expected-note 2{{'const DR1402::NoMove1 &'}}
196  struct NoMove2 { NonTrivialCopyAssign ntcc; }; // expected-note 2{{'const DR1402::NoMove2 &'}}
197  struct NoMove3 : NonTrivialCopyCtor {}; // expected-note 2{{'const DR1402::NoMove3 &'}}
198  struct NoMove4 : NonTrivialCopyAssign {}; // expected-note 2{{'const DR1402::NoMove4 &'}}
199  struct NoMove5 : virtual NonTrivialCopyCtor {}; // expected-note 2{{'const DR1402::NoMove5 &'}}
200  struct NoMove6 : virtual NonTrivialCopyAssign {}; // expected-note 2{{'const DR1402::NoMove6 &'}}
201  struct NoMove7 : NonTrivialCopyCtorVBase {}; // expected-note 2{{'DR1402::NoMove7 &'}}
202  struct NoMove8 : NonTrivialCopyAssignVBase {}; // expected-note 2{{'DR1402::NoMove8 &'}}
203
204  // A non-trivially-move-assignable virtual base class inhibits the declaration
205  // of a move assignment (which might move-assign the base class multiple
206  // times).
207  struct NoMove9 : NonTrivialMoveAssign {};
208  struct NoMove10 : virtual NonTrivialMoveAssign {}; // expected-note {{'DR1402::NoMove10 &'}}
209  struct NoMove11 : NonTrivialMoveAssignVBase {}; // expected-note {{'DR1402::NoMove11 &'}}
210
211  struct Test {
212    friend NoMove1::NoMove1(NoMove1 &&); // expected-error {{no matching function}}
213    friend NoMove2::NoMove2(NoMove2 &&); // expected-error {{no matching function}}
214    friend NoMove3::NoMove3(NoMove3 &&); // expected-error {{no matching function}}
215    friend NoMove4::NoMove4(NoMove4 &&); // expected-error {{no matching function}}
216    friend NoMove5::NoMove5(NoMove5 &&); // expected-error {{no matching function}}
217    friend NoMove6::NoMove6(NoMove6 &&); // expected-error {{no matching function}}
218    friend NoMove7::NoMove7(NoMove7 &&); // expected-error {{no matching function}}
219    friend NoMove8::NoMove8(NoMove8 &&); // expected-error {{no matching function}}
220    friend NoMove9::NoMove9(NoMove9 &&);
221    friend NoMove10::NoMove10(NoMove10 &&);
222    friend NoMove11::NoMove11(NoMove11 &&);
223
224    friend NoMove1 &NoMove1::operator=(NoMove1 &&); // expected-error {{no matching function}}
225    friend NoMove2 &NoMove2::operator=(NoMove2 &&); // expected-error {{no matching function}}
226    friend NoMove3 &NoMove3::operator=(NoMove3 &&); // expected-error {{no matching function}}
227    friend NoMove4 &NoMove4::operator=(NoMove4 &&); // expected-error {{no matching function}}
228    friend NoMove5 &NoMove5::operator=(NoMove5 &&); // expected-error {{no matching function}}
229    friend NoMove6 &NoMove6::operator=(NoMove6 &&); // expected-error {{no matching function}}
230    friend NoMove7 &NoMove7::operator=(NoMove7 &&); // expected-error {{no matching function}}
231    friend NoMove8 &NoMove8::operator=(NoMove8 &&); // expected-error {{no matching function}}
232    friend NoMove9 &NoMove9::operator=(NoMove9 &&);
233    friend NoMove10 &NoMove10::operator=(NoMove10 &&); // expected-error {{no matching function}}
234    friend NoMove11 &NoMove11::operator=(NoMove11 &&); // expected-error {{no matching function}}
235  };
236}
237