關(guān)于繼承和dynamic_cast的問(wèn)題

declare

寫(xiě)了如下代碼
class x
{public:
  x(){};
  virtual ~x() {};
}
class A
  {public:
    A(){};
   virtual ~A(){};
  }
class B:public A
  {public:
    B(){};
   virtual ~B(){};
  }
  class C:public B
  {public: C(){};
    virtual ~C(){};
  }
class D:public x,public C
  {public: D(){};
    virtual ~D(){};
}

int main()
  { D *pd=new D;
   A *pa=dynamic_cast<A*>(pd);
  return 0;}
編譯出錯(cuò)，錯(cuò)誤如下

g++ -o dynamic_cast dynamic_cast.cpp
dynamic_cast.cpp:26: error: new types may not be defined in a return type
dynamic_cast.cpp:26: error: two or more data types in declaration of `main'
dynamic_cast.cpp:26: error: two or more data types in declaration of `main'
dynamic_cast.cpp:26: error: two or more data types in declaration of `main'
dynamic_cast.cpp:26: error: two or more data types in declaration of `main'
dynamic_cast.cpp:26: error: extraneous `int' ignored
dynamic_cast.cpp:26: error: `main' must return `int'

antigloss

該有 ; 的地方?jīng)]有，不該有 ; 的地方卻反而有了

yangwen_abc

該有 ; 的地方?jīng)]有


class x
{public:
  x(){};
  virtual ~x() {};
};
class A
  {public:
    A(){};
   virtual ~A(){};
  };
class B:public A
  {public:
    B(){};
   virtual ~B(){};
  };
  class C:public B
  {public: C(){};
    virtual ~C(){};
  };
class D:public x,public C
  {public: D(){};
    virtual ~D(){};
};

int main()
  { D *pd=new D;
   A *pa=dynamic_cast<A*>(pd);
  return 0;}

baohuaihuai

都dynamic_cast了還犯這種低級(jí)錯(cuò)誤...