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  #include  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(ref_shape); } catch (bad_cast b) { cout << "Caught: " << b.what(); } } 

 Circle circle_instance; Circle& ref_circle = circle_instance; 

 Shape& ref_shape = dynamic_cast(ref_circle);