用C++写建造者模式

根据 大话设计模式 第13章的建造者模式，用C++实现一遍

#include <iostream>
#include <vector>
#include <string>

using namespace std;

//Product类——产品类，由多个部件组成
class Product
{
public:
    void Add(string part)
    {
        v.push_back(part);
    }

    void Show()
    {
        for(int i = 0; i < v.size(); i++)
        {
            cout << v[i] << endl;
        }
    }
protected:
    vector<string> v;
};

//Builder类——抽象建造者类，确定产品由什么部件组成
//并声明一个得到产品建造后结果的方法GetResult
class Builder
{
public:
    virtual void BuildPartA() = 0;
    virtual void BuildPartB() = 0;
    virtual Product* GetResult() = 0;
};

//建造具体的两个部件A、B
class ConcreateBuilder1:public Builder
{
public:
    void BuildPartA()
    {
        product->Add("部件A");
    }
    void BuildPartB()
    {
        product->Add("部件B");
    }
    Product* GetResult()
    {
        return product;
    }
protected:
    Product* product = new Product;
};

//建造具体的两个部件X、Y
class ConcreateBuilder2:public Builder
{
public:
    void BuildPartA()
    {
        product->Add("部件X");
    }
    void BuildPartB()
    {
        product->Add("部件Y");
    }
    Product* GetResult()
    {
        return product;
    }
protected:
    Product* product = new Product;
};

//Director类——指挥者类
class Director
{
public:
    //void setBuilder(Builder *b)
    //{
    //    builder = b;
    //}

    void Construct(Builder* builder)//进行组装
    {
        builder->BuildPartA();
        builder->BuildPartB();
    }
private:
    Builder* builder;
};

int main(int argc, char *argv[])
{
    Builder *b1 = new ConcreateBuilder1;//建造者1 建造A和B

    Director *d = new Director;//指挥者
    //d->setBuilder(b);
    d->Construct(b1);//指挥者 指挥 建造者 建造

    Product *p = b1->GetResult();//产品
    p->Show();

    cout << "****************" << endl;

    Builder *b2 = new ConcreateBuilder2;//建造者2 建造X和Y

    d->Construct(b2);

    p = b2->GetResult();
    p->Show();

    return 0;
}