blob: 688713582657415ff80d49a3f331901a48055666 (
plain)
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
|
// RUN: %clang_cc1 -fsyntax-only -faccess-control -verify %s -std=c++0x
namespace T1 {
class A {
virtual int f(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual void f(); // expected-error{{virtual function 'f' has a different return type ('void') than the function it overrides (which has return type 'int')}}
};
}
namespace T2 {
struct a { };
struct b { };
class A {
virtual a* f(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual b* f(); // expected-error{{return type of virtual function 'f' is not covariant with the return type of the function it overrides ('T2::b *' is not derived from 'T2::a *')}}
};
}
namespace T3 {
struct a { };
struct b : private a { }; // expected-note{{declared private here}}
class A {
virtual a* f(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual b* f(); // expected-error{{invalid covariant return for virtual function: 'T3::a' is a private base class of 'T3::b'}}
};
}
namespace T4 {
struct a { };
struct a1 : a { };
struct b : a, a1 { };
class A {
virtual a* f(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual b* f(); // expected-error{{return type of virtual function 'f' is not covariant with the return type of the function it overrides (ambiguous conversion from derived class 'T4::b' to base class 'T4::a':\n\
struct T4::b -> struct T4::a\n\
struct T4::b -> struct T4::a1 -> struct T4::a)}}
};
}
namespace T5 {
struct a { };
class A {
virtual a* const f();
virtual a* const g(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual a* const f();
virtual a* g(); // expected-error{{return type of virtual function 'g' is not covariant with the return type of the function it overrides ('T5::a *' has different qualifiers than 'T5::a *const')}}
};
}
namespace T6 {
struct a { };
class A {
virtual const a* f();
virtual a* g(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual a* f();
virtual const a* g(); // expected-error{{return type of virtual function 'g' is not covariant with the return type of the function it overrides (class type 'T6::a const *' is more qualified than class type 'T6::a *'}}
};
}
namespace T7 {
struct a { };
struct b { };
class A {
a* f();
};
class B : A {
virtual b* f();
};
}
namespace T8 {
struct a { };
struct b; // expected-note {{forward declaration of 'T8::b'}}
class A {
virtual a *f();
};
class B : A {
b* f(); // expected-error {{return type of virtual function 'f' is not covariant with the return type of the function it overrides ('T8::b' is incomplete)}}
};
}
namespace T9 {
struct a { };
template<typename T> struct b : a {
int a[sizeof(T) ? -1 : -1]; // expected-error {{array size is negative}}
};
class A {
virtual a *f();
};
class B : A {
virtual b<int> *f(); // expected-note {{in instantiation of template class 'T9::b<int>' requested here}}
};
}
// PR5656
class X0 {
virtual void f0();
};
class X1 : public X0 {
void f0() = 0;
};
template <typename Base>
struct Foo : Base {
void f(int) = 0; // expected-error{{not virtual and cannot be declared pure}}
};
struct Base1 { virtual void f(int); };
struct Base2 { };
void test() {
(void)sizeof(Foo<Base1>);
(void)sizeof(Foo<Base2>); // expected-note{{instantiation}}
}
template<typename Base>
struct Foo2 : Base {
template<typename T> int f(T);
};
void test2() {
Foo2<Base1> f1;
Foo2<Base2> f2;
f1.f(17);
f2.f(17);
};
struct Foo3 {
virtual void f(int) = 0; // expected-note{{pure virtual function}}
};
template<typename T>
struct Bar3 : Foo3 {
void f(T);
};
void test3() {
Bar3<int> b3i; // okay
Bar3<float> b3f; // expected-error{{is an abstract class}}
}
// 5920
namespace PR5920 {
class Base {};
template <typename T>
class Derived : public Base {};
class Foo {
public:
virtual Base* Method();
};
class Bar : public Foo {
public:
virtual Derived<int>* Method();
};
}
// Look through template types and typedefs to see whether return types are
// pointers or references.
namespace PR6110 {
class Base {};
class Derived : public Base {};
typedef Base* BaseP;
typedef Derived* DerivedP;
class X { virtual BaseP f(); };
class X1 : public X { virtual DerivedP f(); };
template <typename T> class Y { virtual T f(); };
template <typename T1, typename T> class Y1 : public Y<T> { virtual T1 f(); };
Y1<Derived*, Base*> y;
}
// Defer checking for covariance if either return type is dependent.
namespace type_dependent_covariance {
struct B {};
template <int N> struct TD : public B {};
template <> struct TD<1> {};
template <int N> struct TB {};
struct D : public TB<0> {};
template <int N> struct X {
virtual B* f1(); // expected-note{{overridden virtual function is here}}
virtual TB<N>* f2(); // expected-note{{overridden virtual function is here}}
};
template <int N, int M> struct X1 : X<N> {
virtual TD<M>* f1(); // expected-error{{return type of virtual function 'f1' is not covariant with the return type of the function it overrides ('TD<1> *'}}
virtual D* f2(); // expected-error{{return type of virtual function 'f2' is not covariant with the return type of the function it overrides ('type_dependent_covariance::D *' is not derived from 'TB<1> *')}}
};
X1<0, 0> good;
X1<0, 1> bad_derived; // expected-note{{instantiation}}
X1<1, 0> bad_base; // expected-note{{instantiation}}
}
namespace T10 {
struct A { };
struct B : A { };
struct C {
virtual A&& f();
};
struct D : C {
virtual B&& f();
};
};
namespace T11 {
struct A { };
struct B : A { };
struct C {
virtual A& f(); // expected-note {{overridden virtual function is here}}
};
struct D : C {
virtual B&& f(); // expected-error {{virtual function 'f' has a different return type ('T11::B &&') than the function it overrides (which has return type 'T11::A &')}}
};
};
namespace T12 {
struct A { };
struct B : A { };
struct C {
virtual A&& f(); // expected-note {{overridden virtual function is here}}
};
struct D : C {
virtual B& f(); // expected-error {{virtual function 'f' has a different return type ('T12::B &') than the function it overrides (which has return type 'T12::A &&')}}
};
};
|