解析C++编程中的bad_cast异常

catch (bad_cast)
  statement

class bad_cast : public exception {
public:
  bad_cast(const char * _Message = "bad cast");
  bad_cast(const bad_cast &);
  virtual ~bad_cast();
};

// expre_bad_cast_Exception.cpp
// compile with: /EHsc /GR
#include <typeinfo.h>
#include <iostream>

class Shape {
public:
  virtual void virtualfunc() const {}
};

class Circle: public Shape {
public:
  virtual void virtualfunc() const {}
};

using namespace std;
int main() {
  Shape shape_instance;
  Shape& ref_shape = shape_instance;
  try {
   Circle& ref_circle = dynamic_cast<Circle&>(ref_shape); 
  }
  catch (bad_cast b) {
   cout << "Caught: " << b.what();
  }
}

Circle circle_instance;
Circle& ref_circle = circle_instance;

Shape& ref_shape = dynamic_cast<Shape&>(ref_circle);