rttiwithreferences.cpp

来自「Thingking in c++第二版」· C++ 代码 · 共 30 行

//: C08:RTTIwithReferences.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
#include <cassert>
#include <typeinfo>
using namespace std;

class B {
public:
  virtual float f() { return 1.0;}
  virtual ~B() {}
};

class D : public B { /* ... */ };

int main() {
  B* p = new D;
  B& r = *p;
  assert(typeid(p) == typeid(B*));
  assert(typeid(p) != typeid(D*));
  assert(typeid(r) == typeid(D));
  assert(typeid(*p) == typeid(D));
  assert(typeid(*p) != typeid(B));
  assert(typeid(&r) == typeid(B*));
  assert(typeid(&r) != typeid(D*));
  assert(typeid(r.f()) == typeid(float));
} ///:~