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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
| // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wno-inaccessible-base %s
// Tests for implicit (non-)declaration of move constructor and
// assignment: p9, p11, p20, p23.
// This class, used as a member, allows to distinguish move from copy because
// move operations are no-throw, copy operations aren't.
struct ThrowingCopy {
ThrowingCopy() noexcept;
ThrowingCopy(ThrowingCopy &&) noexcept;
ThrowingCopy(const ThrowingCopy &) noexcept(false);
ThrowingCopy & operator =(ThrowingCopy &&) noexcept;
ThrowingCopy & operator =(const ThrowingCopy &) noexcept(false);
};
struct HasCopyConstructor {
ThrowingCopy tc;
HasCopyConstructor() noexcept;
HasCopyConstructor(const HasCopyConstructor &) noexcept(false);
};
struct HasCopyAssignment {
ThrowingCopy tc;
HasCopyAssignment() noexcept;
HasCopyAssignment & operator =(const HasCopyAssignment &) noexcept(false);
};
struct HasMoveConstructor {
ThrowingCopy tc;
HasMoveConstructor() noexcept;
HasMoveConstructor(HasMoveConstructor &&) noexcept; // expected-note {{copy assignment operator is implicitly deleted because 'HasMoveConstructor' has a user-declared move constructor}}
};
struct HasMoveAssignment { // expected-note {{implicit copy constructor}}
ThrowingCopy tc;
HasMoveAssignment() noexcept;
HasMoveAssignment & operator =(HasMoveAssignment &&) noexcept;
};
struct HasDestructor {
ThrowingCopy tc;
HasDestructor() noexcept;
~HasDestructor() noexcept;
};
void test_basic_exclusion() {
static_assert(!noexcept(HasCopyConstructor((HasCopyConstructor()))), "");
HasCopyConstructor hcc;
static_assert(!noexcept(hcc = HasCopyConstructor()), "");
static_assert(!noexcept(HasCopyAssignment((HasCopyAssignment()))), "");
HasCopyAssignment hca;
static_assert(!noexcept(hca = HasCopyAssignment()), "");
static_assert(noexcept(HasMoveConstructor((HasMoveConstructor()))), "");
HasMoveConstructor hmc;
hmc = HasMoveConstructor(); // expected-error {{object of type 'HasMoveConstructor' cannot be assigned because its copy assignment operator is implicitly deleted}}
(HasMoveAssignment(HasMoveAssignment())); // expected-error {{uses deleted function}}
HasMoveAssignment hma;
static_assert(noexcept(hma = HasMoveAssignment()), "");
static_assert(!noexcept(HasDestructor((HasDestructor()))), "");
HasDestructor hd;
static_assert(!noexcept(hd = HasDestructor()), "");
}
struct PrivateMove {
PrivateMove() noexcept;
PrivateMove(const PrivateMove &) noexcept(false);
PrivateMove & operator =(const PrivateMove &) noexcept(false);
private:
PrivateMove(PrivateMove &&) noexcept;
PrivateMove & operator =(PrivateMove &&) noexcept;
};
struct InheritsPrivateMove : PrivateMove {};
struct ContainsPrivateMove {
PrivateMove pm;
};
struct PrivateDestructor {
PrivateDestructor() noexcept;
PrivateDestructor(const PrivateDestructor &) noexcept(false);
PrivateDestructor(PrivateDestructor &&) noexcept;
private:
~PrivateDestructor() noexcept;
};
struct InheritsPrivateDestructor : PrivateDestructor {}; // expected-note{{base class 'PrivateDestructor' has an inaccessible destructor}}
struct ContainsPrivateDestructor {
PrivateDestructor pd; // expected-note{{field 'pd' has an inaccessible destructor}}
};
struct NonTrivialCopyOnly {
NonTrivialCopyOnly() noexcept;
NonTrivialCopyOnly(const NonTrivialCopyOnly &) noexcept(false);
NonTrivialCopyOnly & operator =(const NonTrivialCopyOnly &) noexcept(false);
};
struct InheritsNonTrivialCopyOnly : NonTrivialCopyOnly {};
struct ContainsNonTrivialCopyOnly {
NonTrivialCopyOnly ntco;
};
struct ContainsConst {
const int i;
ContainsConst() noexcept;
ContainsConst & operator =(ContainsConst &); // expected-note {{not viable}}
};
struct ContainsRef {
int &i;
ContainsRef() noexcept;
ContainsRef & operator =(ContainsRef &); // expected-note {{not viable}}
};
struct Base {
Base & operator =(Base &);
};
struct DirectVirtualBase : virtual Base {}; // expected-note {{copy assignment operator) not viable}}
struct IndirectVirtualBase : DirectVirtualBase {}; // expected-note {{copy assignment operator) not viable}}
void test_deletion_exclusion() {
// FIXME: How to test the union thing?
static_assert(!noexcept(InheritsPrivateMove(InheritsPrivateMove())), "");
static_assert(!noexcept(ContainsPrivateMove(ContainsPrivateMove())), "");
InheritsPrivateMove ipm;
static_assert(!noexcept(ipm = InheritsPrivateMove()), "");
ContainsPrivateMove cpm;
static_assert(!noexcept(cpm = ContainsPrivateMove()), "");
(InheritsPrivateDestructor(InheritsPrivateDestructor())); // expected-error {{call to implicitly-deleted default constructor}}
(ContainsPrivateDestructor(ContainsPrivateDestructor())); // expected-error {{call to implicitly-deleted default constructor}}
static_assert(!noexcept(InheritsNonTrivialCopyOnly(InheritsNonTrivialCopyOnly())), "");
static_assert(!noexcept(ContainsNonTrivialCopyOnly(ContainsNonTrivialCopyOnly())), "");
InheritsNonTrivialCopyOnly intco;
static_assert(!noexcept(intco = InheritsNonTrivialCopyOnly()), "");
ContainsNonTrivialCopyOnly cntco;
static_assert(!noexcept(cntco = ContainsNonTrivialCopyOnly()), "");
ContainsConst cc;
cc = ContainsConst(); // expected-error {{no viable}}
ContainsRef cr;
cr = ContainsRef(); // expected-error {{no viable}}
DirectVirtualBase dvb;
dvb = DirectVirtualBase(); // expected-error {{no viable}}
IndirectVirtualBase ivb;
ivb = IndirectVirtualBase(); // expected-error {{no viable}}
}
struct ContainsRValueRef {
int&& ri;
ContainsRValueRef() noexcept;
};
void test_contains_rref() {
(ContainsRValueRef(ContainsRValueRef()));
}
namespace DR1402 {
struct NonTrivialCopyCtor {
NonTrivialCopyCtor(const NonTrivialCopyCtor &);
};
struct NonTrivialCopyAssign {
NonTrivialCopyAssign &operator=(const NonTrivialCopyAssign &);
};
struct NonTrivialCopyCtorVBase : virtual NonTrivialCopyCtor {
NonTrivialCopyCtorVBase(NonTrivialCopyCtorVBase &&);
NonTrivialCopyCtorVBase &operator=(NonTrivialCopyCtorVBase &&) = default;
};
struct NonTrivialCopyAssignVBase : virtual NonTrivialCopyAssign {
NonTrivialCopyAssignVBase(NonTrivialCopyAssignVBase &&);
NonTrivialCopyAssignVBase &operator=(NonTrivialCopyAssignVBase &&) = default;
};
struct NonTrivialMoveAssign {
NonTrivialMoveAssign(NonTrivialMoveAssign&&);
NonTrivialMoveAssign &operator=(NonTrivialMoveAssign &&);
};
struct NonTrivialMoveAssignVBase : virtual NonTrivialMoveAssign {
NonTrivialMoveAssignVBase(NonTrivialMoveAssignVBase &&);
NonTrivialMoveAssignVBase &operator=(NonTrivialMoveAssignVBase &&) = default;
};
// DR1402: A non-movable, non-trivially-copyable class type as a subobject no
// longer inhibits the declaration of a move operation.
struct NoMove1 { NonTrivialCopyCtor ntcc; };
struct NoMove2 { NonTrivialCopyAssign ntcc; };
struct NoMove3 : NonTrivialCopyCtor {};
struct NoMove4 : NonTrivialCopyAssign {};
struct NoMove5 : virtual NonTrivialCopyCtor {};
struct NoMove6 : virtual NonTrivialCopyAssign {};
struct NoMove7 : NonTrivialCopyCtorVBase {};
struct NoMove8 : NonTrivialCopyAssignVBase {};
// DR1402: A non-trivially-move-assignable virtual base class no longer
// inhibits the declaration of a move assignment (even though it might
// move-assign the base class multiple times).
struct NoMove9 : NonTrivialMoveAssign {};
struct NoMove10 : virtual NonTrivialMoveAssign {};
struct NoMove11 : NonTrivialMoveAssignVBase {};
template<typename T> void test(T t) {
(void)T(static_cast<T&&>(t)); // ok
t = static_cast<T&&>(t); // ok
}
template void test(NoMove1);
template void test(NoMove2);
template void test(NoMove3);
template void test(NoMove4);
template void test(NoMove5);
template void test(NoMove6);
template void test(NoMove7);
template void test(NoMove8);
template void test(NoMove9);
template void test(NoMove10);
template void test(NoMove11);
struct CopyOnly {
CopyOnly(const CopyOnly&);
CopyOnly &operator=(const CopyOnly&);
};
struct MoveOnly {
MoveOnly(MoveOnly&&); // expected-note {{user-declared move}}
MoveOnly &operator=(MoveOnly&&);
};
template void test(CopyOnly); // ok, copies
template void test(MoveOnly); // ok, moves
struct CopyAndMove { // expected-note {{implicitly deleted}}
CopyOnly co;
MoveOnly mo; // expected-note {{deleted copy}}
};
template void test(CopyAndMove); // ok, copies co, moves mo
void test2(CopyAndMove cm) {
(void)CopyAndMove(cm); // expected-error {{deleted}}
cm = cm; // expected-error {{deleted}}
}
namespace VbaseMove {
struct A {};
struct B { B &operator=(B&&); };
struct C { C &operator=(const C&); };
struct D { B b; };
template<typename T, unsigned I, bool NonTrivialMove = false>
struct E : virtual T {};
template<typename T, unsigned I>
struct E<T, I, true> : virtual T { E &operator=(E&&); };
template<typename T>
struct F :
E<T, 0>, // expected-note-re 2{{'{{[BD]}}' is a virtual base class of base class 'E<}}
E<T, 1> {}; // expected-note-re 2{{'{{[BD]}}' is a virtual base class of base class 'E<}}
template<typename T>
struct G : E<T, 0, true>, E<T, 0> {};
template<typename T>
struct H : E<T, 0, true>, E<T, 1, true> {};
template<typename T>
struct I : E<T, 0>, T {};
template<typename T>
struct J :
E<T, 0>, // expected-note-re 2{{'{{[BD]}}' is a virtual base class of base class 'E<}}
virtual T {}; // expected-note-re 2{{virtual base class '{{[BD]}}' declared here}}
template<typename T> void move(T t) { t = static_cast<T&&>(t); }
// expected-warning-re@-1 4{{defaulted move assignment operator of {{.*}} will move assign virtual base class '{{[BD]}}' multiple times}}
template void move(F<A>);
template void move(F<B>); // expected-note {{in instantiation of}}
template void move(F<C>);
template void move(F<D>); // expected-note {{in instantiation of}}
template void move(G<A>);
template void move(G<B>);
template void move(G<C>);
template void move(G<D>);
template void move(H<A>);
template void move(H<B>);
template void move(H<C>);
template void move(H<D>);
template void move(I<A>);
template void move(I<B>);
template void move(I<C>);
template void move(I<D>);
template void move(J<A>);
template void move(J<B>); // expected-note {{in instantiation of}}
template void move(J<C>);
template void move(J<D>); // expected-note {{in instantiation of}}
}
}
namespace PR12625 {
struct X; // expected-note {{forward decl}}
struct Y {
X x; // expected-error {{incomplete}}
} y = Y();
}
|