C++普通成员函数的重定义

// test.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <cstdlib>
#include <new>
#include <iostream>
using namespace std;

class Base{
public:
int f(){
cout<<"int f() Base"<<endl;
return 0;
}
void f(int){
cout<<"void f() Derived1"<<endl;
}
};

class Derived1:public Base{
public:
void f(){
cout<<"void f() Derived1"<<endl;
}
};

class Derived2:public Base{
public:
void f(int){
cout<<"void f(int) Derived2"<<endl;
}
};

int _tmain(int argc, _TCHAR* argv[])
{
Derived1 d1;
Derived2 d2;
Base b;
b.f();
d1.f();
d2.f();//错误,定义void f(int)，使得Base::f不可见。
d2.f(1);

return 0;
}