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