设计模式之工厂方法模式(c++)

工厂方法模式定义

定义一个用于创建对象的接口，让子类决定实例化哪一个类。核心结构分别是抽象工厂以及具体工厂，抽象产品以及具体产品。

#include <iostream>

using namespace std;

//抽象产品
class IWine
{
public:
	virtual ~IWine(){}
	virtual void createWine() = 0;
};

//抽象工厂类
class IFactory
{
public:
	virtual ~IFactory(){}
	virtual IWine* createFactory() = 0;
};

//具体产品 啤酒
class Beer :public IWine
{
public:
	void createWine()
	{
		cout << "生产啤酒" << endl;
	}
};

//具体产品 白酒
class Spirit :public IWine
{
public:
	void createWine()
	{
		cout << "生产白酒" << endl;
	}
};

//具体产品 红酒
class RedWine :public IWine
{
public:
	void createWine()
	{
		cout << "生产红酒" << endl;
	}
};

//啤酒工厂
class BeerFactory :public IFactory
{
public:
	IWine* createFactory()
	{
		return new Beer;
	}
};

//白酒工厂
class SpiritFactory :public IFactory
{
public:
	IWine* createFactory()
	{
		return new Spirit;
	}
};

//红酒工厂
class RedWineFactory :public IFactory
{
public:
	IWine* createFactory()
	{
		return new RedWine;
	}
};

int main()	//客户端
{
	IFactory *factory = nullptr;
	//factory = new BeerFactory;
	//factory = new RedWineFactory;
	factory = new SpiritFactory;
	if (factory)
	{
		factory->createFactory()->createWine();
		delete factory;
		factory = nullptr;
	}
	return 0;
}