C++设计模式之工厂方法模式

来自:http://blog.csdn.net/pangshaohua/article/details/38912555

参考写的一个工厂demo

1、定义"背景风格的抽象类"、"背景风格的抽象工厂"

#pragma once
/*背景风格抽象类*/
class CBackgroundStyle
{
public:
    virtual void DisplayStyle() = 0;//纯虚函数
};


/*背景风格抽象工厂 */
class StyleFactory
{
public:
    //工厂方法，具体背景风格的创建过程由子类完成  
    virtual CBackgroundStyle* CreateBackgroundStyleFactory() = 0;
    void DisplayStyle()
    {//显示风格
        m_pBackgroundStyle = CreateBackgroundStyleFactory();
        m_pBackgroundStyle->DisplayStyle();
    }

public:
    StyleFactory():m_pBackgroundStyle(NULL)
    {

    }
    ~StyleFactory()
    {
        if(NULL != m_pBackgroundStyle)
        {
            delete m_pBackgroundStyle;
            m_pBackgroundStyle = NULL;
        }
    }

private:
    //保存创建的背景风格
    CBackgroundStyle* m_pBackgroundStyle;
};

2、定义"潮流风格背景类"、"潮流风格工厂类"

//FashionStyle.h

//FashionStyle.h
#pragma once
/*潮流风格背景类 */
class CFashionStyle: public CBackgroundStyle
{
public:
    CFashionStyle(void);
    ~CFashionStyle(void);
public:
    virtual void DisplayStyle();
};

/*潮流风格工厂*/
class FashionStyleFactory: public StyleFactory
{
    virtual CBackgroundStyle* CreateBackgroundStyleFactory()
    {
        CBackgroundStyle* pFashionStyle = new CFashionStyle();
        return pFashionStyle;
    };
};

FashionStyle.cpp

#include "StdAfx.h"
#include "BackgroundStyle.h"
#include "FashionStyle.h"

CFashionStyle::CFashionStyle(void)
{
}


CFashionStyle::~CFashionStyle(void)
{
}

void CFashionStyle::DisplayStyle()
{
    AfxMessageBox(_T("潮流风格背景"));
}

//调用方式

void CLoadDllDemoDlg::OnBnClickedButton18()
{//工厂模式
    StyleFactory* pFactory = new FashionStyleFactory();
    pFactory->DisplayStyle();
    delete pFactory;
    pFactory = NULL;
}

上图