dynamiccast.cpp

来自「thingking in c++（C++编程思想） 各章节课后练习的答案」· C++ 代码 · 共 22 行

//: C15:DynamicCast.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
#include <iostream>
using namespace std;

class Pet { public: virtual ~Pet(){}};
class Dog : public Pet {};
class Cat : public Pet {};

int main() {
  Pet* b = new Cat; // Upcast
  // Try to cast it to Dog*:
  Dog* d1 = dynamic_cast<Dog*>(b);
  // Try to cast it to Cat*:
  Cat* d2 = dynamic_cast<Cat*>(b);
  cout << "d1 = " << (long)d1 << endl;
  cout << "d2 = " << (long)d2 << endl;
} ///:~