设计模式之Prototype(c++)

Prototype模型:

作用:

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----克隆(clone)对象。


Prototype模型类图如下:

形象说明:如果客户想配钥匙(ConcretePrototype),就可以拿着钥匙去配钥匙的店铺,店铺老板会根据配的钥匙原型,给你配(Clone)钥匙!


具体简单的实例实现:

/*Prototype.hxx*/

#ifndef _PROTOTYPE_H_
#define _PROTOTYPE_H_

class Prototype
{
public:
        virtual ~Prototype();
        virtual Prototype* Clone() const = 0;
protected:
        Prototype();
};

class ConcretePrototype:public Prototype
{
public:
        ConcretePrototype();
        ConcretePrototype(const ConcretePrototype& cp);
        ~ConcretePrototype();
        Prototype* Clone() const;
};
#endif //~_PROTOTYPE_H_
/*Prototype.cxx*/

#include "Prototype.hxx"
#include <iostream>

using namespace std;

Prototype::Prototype()
{

}

Prototype::~Prototype()
{

}

Prototype* Prototype::Clone() const 
{
	return 0;
}

//concretePrototype

ConcretePrototype::ConcretePrototype()
{

}

ConcretePrototype::~ConcretePrototype()
{

}

ConcretePrototype::ConcretePrototype(const ConcretePrototype& cp)
{
	cout<< "ConcretePrototype copy..." << endl;
}

Prototype* ConcretePrototype::Clone() const
{
	return new ConcretePrototype(*this);
}
/*main.cxx*/

#include "Prototype.hxx"

#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
	Prototype* p = new ConcretePrototype();
	Prototype* p1 = p->Clone();

	cout << p <<"||" << p1 << endl;
	
	delete p;
	p = NULL;
	if (p1)
	{
		delete p1;
		p1 = NULL;
	}
	return 0;
}


执行结果:

liujl@liujl-ThinkPad-Edge-E431:~/mysource/Design_model/Prototype$ g++ -o main main.o Prototype.o
liujl@liujl-ThinkPad-Edge-E431:~/mysource/Design_model/Prototype$ ./main 
ConcretePrototype copy...
0xf11010||0xf11030


参考文档:

1、c++设计模式.pdf

2、常见设计模式的解析和实现(C++)之四-Prototype模式

原文地址:https://www.cnblogs.com/riasky/p/3459038.html