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C++设计模式从0进击-2-抽象工厂模式

2024-07-19 10:25:18   221人阅读

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;}
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C++设计模式从0进击-2-抽象工厂模式


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