1 //===-------------------------- test_aux_runtime.cpp ----------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include <typeinfo> 11 #include <iostream> 12 13 // Test taken from 5.2.8.2 14 // When typeid is applied to a glvalue expression whose type is a polymorphic 15 // class type, (10.3), the result refers to a std::type_info object 16 // representing the type of the most derived object (1.8) (that is, the 17 // dynamic type) to which the glvalue refers. If the glvalue expression is 18 // obtained by applying the unary * operator to a pointer(68) and the pointer 19 // is a null pointer value (4.10), the typeid expression throws the 20 // std::bad_typeid exception (18.7.3). 21 // 22 // 68) If p is an expression of pointer type, then *p, (*p), *(p), 23 // ((*p)), *((p)), and so on all meet this requirement. 24 bool bad_typeid_test () { 25 class A { virtual void f() {}}; 26 class B { virtual void g() {}}; 27 28 B *bp = NULL; 29 try {bool b = typeid(*bp) == typeid (A); } 30 catch ( const std::bad_typeid &bc ) { return true; } 31 return false; 32 } 33 34 35 // The value of a failed cast to pointer type is the null pointer value of 36 // the required result type. A failed cast to reference type throws 37 // std::bad_cast (18.7.2). 38 bool bad_cast_test () { 39 class A { virtual void f() {}}; 40 class B { virtual void g() {}}; 41 class D : public virtual A, private B {}; 42 43 D d; 44 B *bp = (B*)&d; // cast needed to break protection 45 try { D &dr = dynamic_cast<D&> (*bp); } 46 catch ( const std::bad_cast &bc ) { return true; } 47 return false; 48 } 49 50 int main ( int argc, char *argv [] ) { 51 int ret_val = 0; 52 53 if ( !bad_typeid_test ()) { 54 std::cerr << "TypeID test failed!" << std::endl; 55 ret_val = 1; 56 } 57 58 if ( !bad_cast_test ()) { 59 std::cerr << "Bad cast test failed!" << std::endl; 60 ret_val = 1; 61 } 62 63 return ret_val; 64 } 65
