看看你的父类是否是public的，如下是正确的范例：
class Dog:public Animal
{
public:
Dog(){cout<<"dog constructor"<<endl;}
virtual ~Dog(){cout<<"dog destructor"<<endl;}
void cry() const{cout<<"dog cry..."<<endl;}
};class Dog:publi
阅读背景：
C++错误集锦之：error C2243: 'type cast' : conversion exists, but is inaccessible
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