67 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: no-exceptions10 11#include <typeinfo>12 13// Test taken from 5.2.8.214// When typeid is applied to a glvalue expression whose type is a polymorphic15// class type, (10.3), the result refers to a std::type_info object16// representing the type of the most derived object (1.8) (that is, the17// dynamic type) to which the glvalue refers. If the glvalue expression is18// obtained by applying the unary * operator to a pointer(68) and the pointer19// is a null pointer value (4.10), the typeid expression throws the20// 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.24bool 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 of40// the required result type. A failed cast to reference type throws41// std::bad_cast (18.7.2).42bool 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 protection49 try { D &dr = dynamic_cast<D&> (*bp); ((void)dr); }50 catch ( const std::bad_cast & ) { return true; }51 return false;52}53 54int 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