#include <iostream>
#include <vector>  //for std::vector
#include <string>  //for std::string
using namespace std;

class Product{
    vector<string> parts;
public:
 	void Add(string part){
      parts.push_back(part);
    }
    void Display(){
      cout<<"\nProduct Parts -------"<<endl;
      for(int i=0;i<parts.size();i++) cout<<parts[i]<<endl;
      cout<<endl;
    }
};

class AbstractBuilder{
protected:
	Product *product = new Product();
public:
    virtual void BuildPartA()=0;
    virtual void BuildPartB()=0;
    virtual Product* GetResult()=0;
};

class Builder1:public AbstractBuilder{
public:
	void BuildPartA(){
      product->Add("PartA ");
    }
    void BuildPartB(){
      product->Add("PartB ");
    }
    Product *GetResult(){
      return product;
    }
};

class Builder2:public AbstractBuilder{
public:
	void BuildPartA(){
      product->Add("PartX ");
    }
    void BuildPartB(){
      product->Add("PartY ");
    }
    Product *GetResult(){
      return product;
    }
};

class Director{
//Builder uses a complex series of steps
public:
	void Construct(AbstractBuilder& builder){
      builder.BuildPartA();
      builder.BuildPartB();
      builder.BuildPartB();
    }
};

int main(){
	// Create one director and two builders
    Director director;

    Builder1 b1;
    Builder2 b2;

    // Construct two products
    director.Construct(b1);
    Product *p1 = b1.GetResult();
    p1->Display();
    delete p1;

    director.Construct(b2);
    Product *p2 = b2.GetResult();
    p2->Display();
    delete p2;
}