Factory Method | 工厂方法

（1）可以使用工厂基类创建产品。

（2）可以使用工厂基类来调用子类实例化的方法，实现了多态。

#include<iostream>
#include<thread>
#include<string>
using namespace std;
//===========abstract product 抽象产品 =====
class Door{
public:
    Door(){cout<<"door:构造函数被调用"<<endl;}
    virtual ~Door()=default;
    virtual void show()=0;
};
//=======concrete product 具体产品=========
class StoneDoor:public Door{
public:
    StoneDoor(){cout<<"StoneDoor:构造函数被调用"<<endl;}
    virtual ~StoneDoor()=default;
    void show() override {cout<<"StoneDoor:show函数被调用"<<endl;}
};
//========factory 工厂基类===========
class Factory{
public:
    Factory(){cout<<"Factroy:构造函数被调用"<<endl;}
    virtual ~Factory()=default;
    virtual Door* creat()=0;
    virtual void DoSomething()=0;
};
//==========concrete Factory 具体产品===========
class StoneFactory:public Factory{
public:
    StoneFactory(){cout<<"StoneFactroy:构造函数被调用"<<endl;}
    virtual ~StoneFactory(){cout<<"StoneFfactory:析构函数被调用"<<endl;}
    Door* creat() override{
        return new StoneDoor;
    }
    void DoSomething() override{cout << "StoneFactory:dosomethng函数被调用"<<endl;}

};
//========client 连接函数=================
int main(int argv,char* argc[]){
    Factory* factory= new StoneFactory;
    Door* door = factory->creat();
    factory->DoSomething();
    delete factory;
    delete door;
    return 0;
}