隐藏，引用父类的虚函数

// testdev.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
using namespace std;
class A
{
public:
	A()	
	{
		cout << "A::A()" << endl;;
	}
	~A()
	{
		cout << "A::~A()" << endl;
	}
public:
	virtual void fun(int n)
	{
		cout << "A::fun()" << endl;
	}
};
class B:public A
{
public:
	B()	
	{
		cout << "B::B()" << endl;;
	}
	~B()
	{
		cout << "B::~B()" << endl;
	}
public:
	using A::fun;
	void fun()
	{
		cout << "B::fun()" << endl;
	}
};

int _tmain(int argc, _TCHAR* argv[])
{
	B b;
	b.fun(1);
	return 0;
}