1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: no-exceptions 10 11 #include <typeinfo> 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); ((void)b); } 30 catch ( const std::bad_typeid &) { 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); ((void)dr); } 46 catch ( const std::bad_cast & ) { return true; } 47 return false; 48 } 49 50 int main ( ) { 51 int ret_val = 0; 52 53 if ( !bad_typeid_test ()) { 54 ret_val = 1; 55 } 56 57 if ( !bad_cast_test ()) { 58 ret_val = 2; 59 } 60 61 return ret_val; 62 } 63