设计模式之简单工厂模式，C++实现

只上图和代码吧

[cpp]
#include "stdafx.h"
#include <windows.h>


enum EOperator
{
    ADD_OPER,
    SUB_OPER
};

class MathOperator
{
public:
    MathOperator(){;}
    virtual ~MathOperator(){;}

    void SetMember(int first, int second)
    {
        m_nFirst = first;
        m_nSecond = second;
    }
    virtual int GetResult() = 0;
protected:
    int m_nFirst;
    int m_nSecond;
};


class AddOperator:public MathOperator
{
public:
    int GetResult()
    {
        return m_nFirst + m_nSecond;
    }
};


class SubOperator:public MathOperator
{
public:
    int GetResult()
    {
        return m_nFirst - m_nSecond;
    }
};

class OperatorFactory
{
public:
    MathOperator *CreateOperator(EOperator eOper)
    {
        MathOperator *pOper = NULL;
        switch (eOper)
        {
        case ADD_OPER:
            pOper = new AddOperator();
            break;
        case SUB_OPER:
            pOper = new SubOperator();
            break;
        }
        return pOper;
    }
};


int _tmain(int argc, _TCHAR* argv[])
{
    OperatorFactory OFactrory;
    MathOperator *pOper = OFactrory.CreateOperator(ADD_OPER);
    pOper->SetMember(2, 3);
    int nResult = pOper->GetResult();
    if (pOper)
    {
        delete pOper;
        pOper = NULL;
    }
    return 0;
}

补充：软件开发 , C++ ,