1// Author: Alfred Miniarik <a8601248@unet.univie.ac.at>
2// test of dynamic_cast
3// runtime detecting of nonpublic
4// inheritance within a cast
5// and therefor failing with result 0.
6
7extern "C" void abort();
8extern "C" int printf (const char *, ...);
9
10static int errors = 0;
11void error(int i)
12{
13  printf("Error %i\n",i);
14  errors++;
15}
16
17// 1. downcast
18
19// 1.1. single inheritance case
20
21struct A {virtual ~A(){}};
22struct AA : A {};
23struct B : A {};
24struct BB : B {};
25class C : B {};
26struct D : C {};
27
28struct CC : B {};
29class DD : CC {};
30
31class CCC : protected B {};
32class DDD : protected CCC {};
33
34void
35test01 ()
36{
37  D d;
38  if(dynamic_cast<D*> ((A*)&d)) error(1);
39  if(dynamic_cast<D*> ((B*)&d)) error(2);
40  if(&d != dynamic_cast<D*> ((C*)&d)) error(3); //counter example
41  if(dynamic_cast<C*> ((B*)&d)) error(4);
42
43  DD dd;
44  if(dynamic_cast<DD*> ((A*)&dd)) error(5);
45  if(dynamic_cast<DD*> ((B*)&dd)) error(6);
46
47  DDD ddd;
48  if(dynamic_cast<DDD*> ((A*)&ddd)) error(7);
49  if(dynamic_cast<DDD*> ((B*)&ddd)) error(8);
50  if(dynamic_cast<CCC*> ((B*)&ddd)) error(9);
51}
52
53// 1.2. multiple inheritance case
54// 1.2.1. all bases are public
55
56struct E : D, CC {};
57struct EE : CC, D {}; //Will search in reverse order.
58
59void
60test02 ()
61{
62  E e;
63  if(dynamic_cast<E*> ((A*)(D*)&e)) error(10);
64  if(dynamic_cast<E*> ((B*)(D*)&e)) error(11);
65  if(&e != dynamic_cast<E*> ((C*)(D*)&e)) error(12); //counter example
66  if(&e != dynamic_cast<E*> ((B*)(CC*)&e)) error(13); //counter example
67  if((CC*)&e != dynamic_cast<CC*> ((B*)(CC*)&e)) error(14); //counter example
68
69  EE ee;
70  if(dynamic_cast<EE*> ((A*)(D*)&ee)) error(15);
71  if(dynamic_cast<EE*> ((B*)(D*)&ee)) error(16);
72  if(&ee != dynamic_cast<EE*> ((C*)(D*)&ee)) error(17); //counter example
73  if(&ee != dynamic_cast<EE*> ((B*)(CC*)&ee)) error(18); //counter example
74  if((CC*)&ee != dynamic_cast<CC*> ((B*)(CC*)&ee)) error(19); //counter example
75}
76
77// 1.2.2 one or more branches are nonpublic
78
79struct X : private BB, E {};
80struct Y : AA, private B {};
81
82class XX : BB, E {};
83
84void
85test03 ()
86{
87  X x;
88  if(&x != dynamic_cast<X*>((B*)(CC*)(E*)&x)) error(20); //counter example
89  XX xx;
90  if(dynamic_cast<XX*>((B*)(CC*)(E*)&xx)) error(21);
91  Y y;
92  if(dynamic_cast<Y*>((B*)&y)) error (22);
93  if(dynamic_cast<Y*>((A*)(B*)&y)) error (23);
94}
95
96// 2. crosscast
97
98struct J {virtual ~J(){};};
99struct K : CC, private J {};
100class KK : J, CC{};
101
102void
103test04 ()
104{
105  E e;
106  if(dynamic_cast<CC*> ((B*)(D*)&e)) error(24);
107  if((CC*)&e != dynamic_cast<CC*> ((C*)(D*)&e)) error(25); //counter example
108  K k;
109  if(dynamic_cast<J*> ((B*)&k)) error(26);
110  KK kk;
111  if(dynamic_cast<J*> ((CC*)&kk)) error(27);
112}
113
114int
115main ()
116{
117  test01();
118  test02();
119  test03();
120  test04();
121  return errors ? 1 : 0;
122}
123