rttiwithexceptions.cpp

来自「Thingking in c++第二版」· C++ 代码 · 共 29 行

//: C08:RTTIwithExceptions.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
#include <typeinfo>
#include <iostream>
using namespace std;
class X { public: virtual ~X(){} };
class B { public: virtual ~B(){} };
class D : public B {};

int main() {
  D d;
  B & b = d; // Upcast to reference
  try {
    X& xr = dynamic_cast<X&>(b);
  } catch(...) {
    cout << "dynamic_cast<X&>(b) failed" 
         << endl;
  }
  X* xp = 0;
  try {
    typeid(*xp); // Throws exception
  } catch(bad_typeid) {
    cout << "Bad typeid() expression" << endl;
  }
} ///:~