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 = nullptr; 29 try { 30 bool b = typeid(*bp) == typeid(A); 31 ((void)b); 32 } catch (const std::bad_typeid&) { 33 return true; 34 } 35 return false; 36 } 37 38 39 // The value of a failed cast to pointer type is the null pointer value of 40 // the required result type. A failed cast to reference type throws 41 // std::bad_cast (18.7.2). 42 bool bad_cast_test () { 43 class A { virtual void f() {}}; 44 class B { virtual void g() {}}; 45 class D : public virtual A, private B {}; 46 47 D d; 48 B *bp = (B*)&d; // cast needed to break protection 49 try { D &dr = dynamic_cast<D&> (*bp); ((void)dr); } 50 catch ( const std::bad_cast & ) { return true; } 51 return false; 52 } 53 54 int main ( ) { 55 int ret_val = 0; 56 57 if ( !bad_typeid_test ()) { 58 ret_val = 1; 59 } 60 61 if ( !bad_cast_test ()) { 62 ret_val = 2; 63 } 64 65 return ret_val; 66 } 67