COM-纯虚类-接口

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

void trace(const char *pMsg) { cout << pMsg << endl; }
interface IX
{
    virtual void __stdcall Fx1() = 0;
    virtual void __stdcall Fx2() = 0;
};

interface IY
{
    virtual void __stdcall Fy1() = 0;
    virtual void __stdcall Fy2() = 0;
};
class CA :public IX, public IY
{
public:
    virtual void __stdcall Fx1() { cout << "CA::Fx1" << endl;}
    virtual void __stdcall Fx2() { cout << "CA::Fx2" << endl;}

    virtual void __stdcall Fy1() { cout << "CA::Fy1" << endl;}
    virtual void __stdcall Fy2() { cout << "CA::Fy2" << endl;}
};

int _tmain(int argc, _TCHAR* argv[])
{
    trace("Client: Create an instance of the component.");
    CA *pA = new CA;

    IX *pIX = pA;
    trace("Client: Use the IX interface.");
    pIX->Fx1();
    pIX->Fx2();

    IY *pIY = pA;
    trace("Client: Use the IY interface.");
    pIY->Fy1();
    pIY->Fy2();

    trace("Client: Delete the component.");
    delete pA;

    return 0;
}