代码

director.h

#pragma once
#include<vector>
#include<string>
#include<iostream>class Product
{
private:std::vector<std::string> _parts;public:void Add(const std::string& part) {_parts.push_back(part);}void show(){std::cout << "product produce----" << std::endl;for (auto item : _parts) {std::cout << item << std::endl;}std::cout << std::endl;}
};class Builder
{
public:virtual void buildPartA() = 0;virtual void buildPartB() = 0;virtual Product* getResult() = 0;
};class ConcreteBuilder1 : public Builder
{
private:Product* _pProduct;public:ConcreteBuilder1() {_pProduct = new Product();}~ConcreteBuilder1() {delete _pProduct;}void buildPartA() override{_pProduct->Add("部件a");}void buildPartB() override{_pProduct->Add("部件b");}// 小心使用。如果该类的对象被析构，得到的指针将为空。Product* getResult() override{if (_pProduct != nullptr) {return _pProduct;}else {return nullptr;}}
};class ConcreteBuilder2 : public Builder
{
private:Product* _pProduct;public:ConcreteBuilder2() {_pProduct = new Product();}~ConcreteBuilder2() {delete _pProduct;}void buildPartA() override{_pProduct->Add("部件x");}void buildPartB() override{_pProduct->Add("部件y");}// 小心使用。如果该类的对象被析构，得到的指针将为空。Product* getResult() override{if (_pProduct != nullptr) {return _pProduct;}else {return nullptr;}}};class Director
{
private:Builder* _pBuilder;public:Director(Builder* p_builder) :_pBuilder(p_builder) {}void construct(){if (_pBuilder != nullptr) {_pBuilder->buildPartA();_pBuilder->buildPartB();}}};

main.cpp

#include<iostream>
#include"Director.h"int main()
{Builder* pBuilder1 = new ConcreteBuilder1();Director* pDirector = new Director(pBuilder1);pDirector->construct(); // 让按builder1的方式生成产品Product* pProduct = pBuilder1->getResult();// 获取产品pProduct->show();Builder* pBuilder2 = new ConcreteBuilder2();pDirector = new Director(pBuilder2);pDirector->construct(); // 让按builder2的方式生成产品pProduct = pBuilder2->getResult(); // 获取产品pProduct->show();delete pDirector;delete pBuilder1;return 0;
}