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
|
/* This test script is part of GDB, the GNU debugger.
Copyright 1993-2020 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
// Pls try the following program on virtual functions and try to do print on
// most of the code in main(). Almost none of them works !
//
// The inheritance structure is:
//
// V : VA VB
// A : (V)
// B : A
// D : AD (V)
// C : (V)
// E : B (V) D C
//
class VA
{
public:
int va;
};
class VB
{
public:
int vb;
int fvb();
virtual int vvb();
};
class V : public VA, public VB
{
public:
int f();
virtual int vv();
int w;
};
class A : virtual public V
{
public:
virtual int f();
private:
int a;
};
class B : public A
{
public:
int f();
private:
int b;
};
class C : public virtual V
{
public:
int c;
};
class AD
{
public:
virtual int vg() = 0;
};
class D : public AD, virtual public V
{
public:
static void s();
virtual int vg();
virtual int vd();
int fd();
int d;
};
class E : public B, virtual public V, public D, public C
{
public:
int f();
int vg();
int vv();
int e;
};
D dd;
D* ppd = ⅆ
AD* pAd = ⅆ
A a;
B b;
C c;
D d;
E e;
V v;
VB vb;
VA va;
A* pAa = &a;
A* pAe = &e;
B* pBe = &e;
D* pDd = &d;
D* pDe = &e;
V* pVa = &a;
V* pVv = &v;
V* pVe = &e;
V* pVd = &d;
AD* pADe = &e;
E* pEe = &e;
VB* pVB = &vb;
void init()
{
a.vb = 1;
b.vb = 2;
c.vb = 3;
d.vb = 4;
e.vb = 5;
v.vb = 6;
vb.vb = 7;
d.d = 1;
e.d = 2;
}
extern "C" int printf(const char *, ...);
int all_count = 0;
int failed_count = 0;
#define TEST(EXPR, EXPECTED) \
ret = EXPR; \
if (ret != EXPECTED) {\
printf("Failed %s is %d, should be %d!\n", #EXPR, ret, EXPECTED); \
failed_count++; } \
all_count++;
int ret;
void test_calls()
{
TEST(pAe->f(), 20);
TEST(pAa->f(), 1);
TEST(pDe->vg(), 202);
TEST(pADe->vg(), 202);
TEST(pDd->vg(), 101);
TEST(pEe->vvb(), 411);
TEST(pVB->vvb(), 407);
TEST(pBe->vvb(), 411);
TEST(pDe->vvb(), 411);
TEST(pEe->vd(), 282);
TEST(pEe->fvb(), 311);
TEST(pEe->D::vg(), 102);
printf("Did %d tests, of which %d failed.\n", all_count, failed_count);
}
int main()
{
init();
e.w = 7;
e.vb = 11;
test_calls();
return 0;
}
int A::f() {return 1;}
int B::f() {return 2;}
void D::s() {}
int E::f() {return 20;}
int D::vg() {return 100+d;}
int E::vg() {return 200+d;}
int V::f() {return 600+w;}
int V::vv() {return 400+w;}
int E::vv() {return 450+w;}
int D::fd() {return 250+d;}
int D::vd() {return 280+d;}
int VB::fvb() {return 300+vb;}
int VB::vvb() {return 400+vb;}
|
