///////////////////////////////////////////////////////////////////////////////////  FileName    :   effect_item33.h//  Version     :   0.10//  Author      :   Ryan Han//  Date        :   2013/07/26 16:50:14//  Comment     :  /////////////////////////////////////////////////////////////////////////////////#ifndef EFFECT_ITEM33_H#define    EFFECT_ITEM33_Hclass base{public:    virtual void mf1() = 0;    virtual void mf1(int);    virtual void mf2();    void mf3();    void mf3(double);private:    int x;};class derive : public base {public:    using base::mf1;    void mf1();    void mf4();private:    int y;};#endif

///////////////////////////////////////////////////////////////////////////////////  FileName    :   effect_item33.cpp//  Version     :   0.10//  Author      :   Ryan Han//  Date        :   2013/07/26 16:50:14//  Comment     :  /////////////////////////////////////////////////////////////////////////////////#include "effect_item33.h"#include <iostream>using namespace std;void base::mf1() {    cout << "base::mf1() was called." << endl;}void base::mf1(int) {    cout << "base::mf1(int) was called." << endl;}void base::mf2() {    cout << "base::mf2() was called." << endl;}void base::mf3() {    cout << "base::mf3() was called." << endl;}void base::mf3(double) {    cout << "base::mf3(double) was called." << endl;}void derive::mf1() {    cout << "derive::mf1() was called." << endl;}void derive::mf4() {    cout << "derive::mf4() was called." << endl;}

///////////////////////////////////////////////////////////////////////////////////  FileName    :   effect_item33_client.cpp//  Version     :   0.10//  Author      :   Ryan Han//  Date        :   2013/07/26 16:50:14//  Comment     :  //    Output        ://    $ ./a///////////////////////////////////////////////////////////////////////////////#include "effect_item33.h"#include <iostream>using namespace std;int main() {    derive d;    d.mf1();    d.mf1(3);    return 0;}