C++设计模式从0进击-2-抽象工厂模式

Abstract Factory（抽象工厂模式）：提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们具体的类。

抽象工厂模式（Abstract Factory）

追MM少不了请吃饭了，麦当劳的鸡翅和肯德基的鸡翅都是MM爱吃的东西，虽然口味有所不同，但不管你带MM去麦当劳或肯德基，只管向服务员说“来四个鸡翅”就行了。麦当劳和肯德基就是生产鸡翅的Factory

工厂模式：客户类和工厂类分开。消费者任何时候需要某种产品，只需向工厂请求即可。消费者无须修改就可以接纳新产品。缺点是当产品修改时，工厂类也要做相应的修改。如：如何创建及如何向客户端提供。

//用户抽象接口
class IUser
{
public:
	virtual void GetUser() = 0;
	virtual void InsertUser() = 0;
};

//部门抽象接口
class IDepartment
{
public:
	virtual void GetDepartment() = 0;
	virtual void InsertDepartment() = 0;
};

//ACESS用户
class CAccessUser: public IUser
{
public:
	virtual void GetUser()
	{
		cout << "Access GetUser" << endl;
	}

	virtual void InsertUser()
	{
		cout << "Access InsertUser" << endl;
	}
};

//ACCESS部门
class CAccessDepartment: public IDepartment
{
public:
	virtual void GetDepartment()
	{
		cout << "Access GetDepartment" << endl;
	}

	virtual void InsertDepartment()
	{
		cout << "Access InsertDepartment" << endl;
	}
};

//SQL用户
class CSqlUser: public IUser
{
public:
	virtual void GetUser()
	{
		cout << "Sql User" << endl;
	}

	virtual void InsertUser()
	{
		cout << "Sql Insert User" << endl;
	}
};

//SQL部门
class CSqlDepartment: public IDepartment
{
public:
	virtual void GetDepartment()
	{
		cout << "Sql Department" << endl;
	}

	virtual void InsertDepartment()
	{
		cout << "Sql Insert Department" << endl;
	}
};

//抽象工厂
class IFactory
{
public:
	virtual IUser * CreateUser() = 0;
	virtual IDepartment * CreateDepartment() = 0;
};

//ACCESS工厂
class AccessFactory: public IFactory
{
public:
	virtual IUser * CreateUser()
	{
		return new CAccessUser();
	}

	virtual IDepartment * CreateDepartment()
	{
		return new CAccessDepartment();
	}
};

//SQL工厂
class SQLFactory: public IFactory
{
public:
	virtual IUser * CreateUser()
	{
		return new CSqlUser();
	}

	virtual IDepartment * CreateDepartment()
	{
		return new CSqlDepartment();
	}
};

int _tmain(int argc, _TCHAR * argv[])
{
	IFactory * factory = new SQLFactory();
	IUser * user = factory->CreateUser();
	IDepartment * depart = factory->CreateDepartment();
	user->GetUser();
	depart->GetDepartment();
	return 0;
}

//关键点是