c++设计模式--简单工厂模式

#include "stdafx.h"
#include <stdlib.h>
#include <string>
#include <iostream>
using namespace std;
//图形抽象类
class CShape
{
public:
CShape()
{
}
virtual ~CShape()
{
}
public:
virtual void Show() const=0;
};

class CRectangle:public CShape
{
public:
CRectangle()
{
}
~CRectangle()
{
}
public:
void Show() const
{
cout<<"我是矩形"<<endl;
}
};

class CEllipes:public CShape
{
public:
CEllipes()
{
}
~CEllipes()
{
}
public:
void Show() const
{
cout<<"我是圆"<<endl;
}
};

class CSimpleFactory
{
public:
CSimpleFactory()
{
}
~CSimpleFactory()
{
}
public:
static CShape* CreateShape(const string strName)
{
if (strName=="矩形")
{
return new CRectangle();
}
if (strName=="圆")
{
return new CEllipes();
}
return NULL;
}
};

int _tmain(int argc, _TCHAR* argv[])
{

cout<<"--------------简单工厂模式测试案例----------------------"<<endl;

CShape *pShape=NULL;
pShape=CSimpleFactory::CreateShape("矩形");
pShape->Show();
cout<<endl<<endl;
delete pShape;
pShape=NULL;

pShape=CSimpleFactory::CreateShape("圆");
pShape->Show();
delete pShape;
pShape=NULL;
system("pause");
return 0;
}