builder模式

#include <iostream>
using namespace std;


struct person{
    int head;
    int body;
};
class Builder
{
public:
    virtual void BuildHead() {}
    virtual void BuildBody() {}
    virtual person* get()=0;
    virtual ~Builder(){}
};
//构造瘦人
class ThinBuilder : public Builder
{
public:
    person * my;
    ThinBuilder(){my=new person;}
    virtual void BuildHead() { cout<<"build thin body"<<endl;my->body=3; }
    virtual void BuildBody() { cout<<"build thin head"<<endl;my->head=5; }
    virtual person* get(){return my;}
};


//构造胖人
class fatBuilder : public Builder
{
public:
    person * my;
    fatBuilder(){my=new person;}
    virtual void BuildHead() { cout<<"build thin body"<<endl;my->body=30; }
    virtual void BuildBody() { cout<<"build thin head"<<endl;my->head=50; }
    virtual person* get(){return my;}
};


//构造的指挥官
class Director
{
private:
    Builder *m_pBuilder;
public:
    Director(Builder *builder) { m_pBuilder = builder; }
    //两种create方法都可以，本质上是一样的
    void Create(){
        m_pBuilder->BuildHead();
        m_pBuilder->BuildBody();
    }

    person* create2(){
        m_pBuilder->BuildHead();
        m_pBuilder->BuildBody();
        return m_pBuilder->get();
    }
};
int main()
{
    ThinBuilder thin;
    Director director(&thin);
    director.Create();
    person* tmp = thin.get();
    cout << tmp->body << "\t" << tmp->head << endl;
    delete tmp;

    fatBuilder thin2;
    Director director2(&thin2);
    tmp = director2.create2();
    cout << tmp->body << "\t" << tmp->head << endl;
    delete tmp;
    return 0;
}