C++基础:构建者设计模式

#include <iostream>
#include <string>
using namespace std;
//构建者设计模式-一种工厂只生产一种复杂的产品
class robot
{
    public:
        string head;
        string upbody;
        string downbody;
};

class robotBuilder
{
    private:
        robot *myRobot;
        
    public:
        robotBuilder()  //构造函数,为成员变量创建一片空间
        {
            myRobot=new robot();
        }
        ~robotBuilder() //析构函数,释放空间,指针指向为空
        {
            delete myRobot;
            myRobot=NULL;
        }
		//成员函数
        robotBuilder *buildHead(string head)
        {
            myRobot->head=head;
            return this;
        }
        robotBuilder *buildUpbody(string upbody)
        {
            myRobot->upbody=upbody;
            return this;
        }
        robotBuilder *builddownbody(string downbody)
        {
            myRobot->downbody=downbody;
            return this;
        }
        robot *build()
        {
        	return myRobot;
		}
		

};
		int main()
		{
			robotBuilder *builder=new robotBuilder();
			robot *robot001=builder->buildHead("美杜莎的头")->buildUpbody("哆啦A梦的上半身")->builddownbody("闪电侠的腿")->build();//最后返回robot的指针
			cout<<robot001->head<<"+"<<robot001->upbody<<"+"<<robot001->downbody;
			delete builder;    //new delete
			return 0;
			
		}