1// { dg-do run } 2// Author: Alfred Miniarik <a8601248@unet.univie.ac.at> 3// test of dynamic_cast 4// runtime detecting of nonpublic 5// inheritance within a cast 6// and therefor failing with result 0. 7 8extern "C" void abort(); 9extern "C" int printf (const char *, ...); 10 11static int errors = 0; 12void error(int i) 13{ 14 printf("Error %i\n",i); 15 errors++; 16} 17 18// 1. downcast 19 20// 1.1. single inheritance case 21 22struct A {virtual ~A(){}}; 23struct AA : A {}; 24struct B : A {}; 25struct BB : B {}; 26class C : B {}; 27struct D : C {}; 28 29struct CC : B {}; 30class DD : CC {}; 31 32class CCC : protected B {}; 33class DDD : protected CCC {}; 34 35void 36test01 () 37{ 38 D d; 39 if(dynamic_cast<D*> ((A*)&d)) error(1); 40 if(dynamic_cast<D*> ((B*)&d)) error(2); 41 if(&d != dynamic_cast<D*> ((C*)&d)) error(3); //counter example 42 if(dynamic_cast<C*> ((B*)&d)) error(4); 43 44 DD dd; 45 if(dynamic_cast<DD*> ((A*)&dd)) error(5); 46 if(dynamic_cast<DD*> ((B*)&dd)) error(6); 47 48 DDD ddd; 49 if(dynamic_cast<DDD*> ((A*)&ddd)) error(7); 50 if(dynamic_cast<DDD*> ((B*)&ddd)) error(8); 51 if(dynamic_cast<CCC*> ((B*)&ddd)) error(9); 52} 53 54// 1.2. multiple inheritance case 55// 1.2.1. all bases are public 56 57struct E : D, CC {}; 58struct EE : CC, D {}; //Will search in reverse order. 59 60void 61test02 () 62{ 63 E e; 64 if(dynamic_cast<E*> ((A*)(D*)&e)) error(10); 65 if(dynamic_cast<E*> ((B*)(D*)&e)) error(11); 66 if(&e != dynamic_cast<E*> ((C*)(D*)&e)) error(12); //counter example 67 if(&e != dynamic_cast<E*> ((B*)(CC*)&e)) error(13); //counter example 68 if((CC*)&e != dynamic_cast<CC*> ((B*)(CC*)&e)) error(14); //counter example 69 70 EE ee; 71 if(dynamic_cast<EE*> ((A*)(D*)&ee)) error(15); 72 if(dynamic_cast<EE*> ((B*)(D*)&ee)) error(16); 73 if(&ee != dynamic_cast<EE*> ((C*)(D*)&ee)) error(17); //counter example 74 if(&ee != dynamic_cast<EE*> ((B*)(CC*)&ee)) error(18); //counter example 75 if((CC*)&ee != dynamic_cast<CC*> ((B*)(CC*)&ee)) error(19); //counter example 76} 77 78// 1.2.2 one or more branches are nonpublic 79 80struct X : private BB, E {}; 81struct Y : AA, private B {}; 82 83class XX : BB, E {}; 84 85void 86test03 () 87{ 88 X x; 89 if(&x != dynamic_cast<X*>((B*)(CC*)(E*)&x)) error(20); //counter example 90 XX xx; 91 if(dynamic_cast<XX*>((B*)(CC*)(E*)&xx)) error(21); 92 Y y; 93 if(dynamic_cast<Y*>((B*)&y)) error (22); 94 if(dynamic_cast<Y*>((A*)(B*)&y)) error (23); 95} 96 97// 2. crosscast 98 99struct J {virtual ~J(){};}; 100struct K : CC, private J {}; 101class KK : J, CC{}; 102 103void 104test04 () 105{ 106 E e; 107 if(dynamic_cast<CC*> ((B*)(D*)&e)) error(24); 108 if((CC*)&e != dynamic_cast<CC*> ((C*)(D*)&e)) error(25); //counter example 109 K k; 110 if(dynamic_cast<J*> ((B*)&k)) error(26); 111 KK kk; 112 if(dynamic_cast<J*> ((CC*)&kk)) error(27); 113} 114 115int 116main () 117{ 118 test01(); 119 test02(); 120 test03(); 121 test04(); 122 return errors ? 1 : 0; 123} 124