factory模式

主要用来解决两个问题

1.将类创建的实例延迟到子类

2.提供类创建接口(将project创建以factory接口形式给出)

factory.h

#ifndef _FACTORY_H

#define _FACTORY_H

#include <iostream>

using namespace std;

class Product

{

public:

virtual ~Product() {};

protected:

Product() {}

};

class RealProduct : public Product

{

public:

RealProduct() {

cout << "RealProduct" << endl;

}

~RealProduct() {}

};

class Factory

{

public:

virtual ~Factory() {}

virtual Product* CreateProduct()=0;

protected:

Factory() {}

};

class RealFactory : public Factory

{

public:

RealFactory() {}

~RealFactory() {}

Product* CreateProduct() {

return new RealProduct;

}

};

#endif // _FACTORY_H

factory.cpp

#include "factory.h"

int main()

{

RealFactory *f = new RealFactory;

f->CreateProduct();

return 0;

}

编译:make factory