设计模式(6)--原型模式

//6.原型模式
//ver1

//原型模式: 用原型实例指定创建对象的种类，并且通过拷贝这些原型创建新的对象。
//原型模式其实就是从一个对象再创建另外一个可定制的对象，而且不需知道任何创建的细节。

//虚基类
class Prototype
{
public:
	Prototype(){}
	virtual ~Prototype(){}
	virtual Prototype * clone() = 0;
};

class ConcretePrototype1 : public Prototype
{
public:
	ConcretePrototype1()
	{
		cout << "ConcretePrototype1 create" << endl;
	}
	ConcretePrototype1(const ConcretePrototype1 &)
	{
		cout << "ConcretePrototype1 copy" << endl;
	}
	virtual ~ConcretePrototype1()
	{
		cout << "ConcretePrototype1 destruction" << endl;
	}
	virtual Prototype * clone()
	{
		return new ConcretePrototype1(*this);
	}
};

class ConcretePrototype2 : public Prototype
{
public:
	ConcretePrototype2()
	{
		cout << "ConcretePrototype2 create" << endl;
	}
	ConcretePrototype2(const ConcretePrototype2 &)
	{
		cout << "ConcretePrototype1 copy" << endl;
	}
	virtual ~ConcretePrototype2()
	{
		cout << "ConcretePrototype2 destruction" << endl;		
	}
	virtual Prototype * clone()
	{
		return new ConcretePrototype2(*this);
	}
};

void main1()
{
	Prototype *ptype1 = new ConcretePrototype1();
	Prototype *copytype1 = ptype1->clone();
}

 

//6.原型模式
//ver2
//首先抽象一个基类
class Resume
{
protected:
	string _name;
public:
	Resume(){}
	virtual ~Resume(){}
	
	virtual void set(const string name)
	{
		_name = name;
	}
	virtual void show(){}
	virtual Resume * clone()
	{
		return 0;
	}
};
class ResumeA : public Resume
{
public:
	ResumeA(string name)
	{
		_name = name;
	}
	ResumeA(const ResumeA & r)
	{
		_name = r._name;
	}
	~ResumeA()
	{

	}

	ResumeA * clone()
	{
		return new ResumeA(*this);
	}
	void show()
	{
		cout << "ResumeA name" << _name <<endl;
	}
};


class ResumeB : public Resume
{
public:
	ResumeB(string name)
	{
		_name = name;
	}
	ResumeB(const ResumeB& r)
	{
		_name = r._name;
	}
	~ResumeB()
	{

	}
	ResumeB * clone()
	{
		return new ResumeB(*this);
	}
	void show()
	{
		cout << "ResumeB name" << _name <<endl;
	}	
};

void main21()
{
	Resume * r1 = new ResumeA("A");
	Resume * r2 = new ResumeB("B");
	Resume * r3 = r1->clone();
	Resume * r4 = r2->clone();
	r1->show();
	r2->show();
	//删除r1,r2
	delete r1;
	delete r2;

	r1 = r2 = NULL;
	//深拷贝所以对r3,r4无影响.
	r3->show();
	r4->show();
	delete r3;
	delete r4;
	r3 = r4 = NULL;
}

 

//操作步骤:
//1.声明一个抽象基类，并定义clone()函数未纯虚函数。
//2.实例化各个子类，并且实现复制构造函数，并实现clone()函数.