任何时候,重新定义基类中的一个重载函数,在新类中,这个函数的其它版本将被自动隐藏。
class dad
{
public:
void overload()
{
cout << "dad::overload()" << endl;
}
void overload(int a)
{
cout << "dad::overload(int a)" << endl;
}
void fun()
{
cout << "dad::fun()" << endl;
}
};
class son1 :public dad
{
public:
void fun()
{
cout << "son1::fun()" << endl;
}
void scope()
{
dad::fun();//基类fun()被隐藏,可通过类作用域运算符指定调用基类fun()
}
};
class son2 :public dad
{
public:
void overload(int a, int b)
{
cout << "son2::overload(int a,int b)" << endl;
}
void scope()
{
dad::overload();//类内部可以通过类作用域运算符访问基类重载版本的函数overload()
}
};
class son3 :public dad
{
public:
int overload(int a)
{
cout << "son3::overload()" << endl;
return 0;
}
};
class son4 :public dad
{
};
void test()
{
//子类成员函数和基类成员函数重名,基类成员函数被隐藏
son4 s4;
s4.fun();//dad::fun
son1 s1;
s1.fun();//son1::fun
//子类和基类的重载函数重名,基类的重载函数被隐藏,子类外部不能访问
son2 s2;
s2.overload(1,1);//son2::overload
son3 s3;
s3.overload(1);//son3.overload
}