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 8 extern "C" void abort(); 9 extern "C" int printf (const char *, ...); 10 11 static int errors = 0; error(int i)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 ~AA22struct A {virtual ~A(){}}; 23 struct AA : A {}; 24 struct B : A {}; 25 struct BB : B {}; 26 class C : B {}; 27 struct D : C {}; 28 29 struct CC : B {}; 30 class DD : CC {}; 31 32 class CCC : protected B {}; 33 class DDD : protected CCC {}; 34 35 void test01()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 57 struct E : D, CC {}; 58 struct EE : CC, D {}; //Will search in reverse order. 59 60 void test02()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 80 struct X : private BB, E {}; 81 struct Y : AA, private B {}; 82 83 class XX : BB, E {}; 84 85 void test03()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 ~JJ99struct J {virtual ~J(){}}; 100 struct K : CC, private J {}; 101 class KK : J, CC{}; 102 103 void test04()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 } 114 115 int main()116main () 117 { 118 test01(); 119 test02(); 120 test03(); 121 test04(); 122 return errors ? 1 : 0; 123 } 124