[学习][笔记]设计模式（基于C/C++实现）＜十＞建造者模式

//director.h 收银员
#ifndef DIRECTOR_H
#define DIRECTOR_H
#include "builder.h"
class Product;
class Builder;
class Director
{
private:
    Builder *builderPtr;
public:
    Director(Builder *builder){
        builderPtr = builder;
    }
    void Build(){
        builderPtr->BuildPartA();
        builderPtr->BuildPartB();
    }
    Product* GetResult(){
        return builderPtr->GetProduct();
    }
};
#endif // DIRECTOR_H
//builder.h 后厨们
#ifndef BUILDER_H
#define BUILDER_H
#include "product.h"
class Builder
{
public:
    virtual void BuildPartA(){}
    virtual void BuildPartB(){}
    virtual Product* GetProduct(){return nullptr;};
};
#endif // BUILDER_H
//builder_concrete.h 小食品+汉堡套餐 搭配的后厨
#ifndef BUILDER_CONCRETE_H
#define BUILDER_CONCRETE_H
#include "product.h"
#include "builder.h"
class ConcreteBuilder:public Builder
{
private:
    Product * productPtr = new Product;
public:
    void BuildPartA() override{
        productPtr->Add("A","薯条");
    }
    void BuildPartB() override{
        productPtr->Add("B","汉堡");
    }
    Product * GetProduct() override{
        return productPtr;
    }
};
#endif // BUILDER_CONCRETE_H
//套餐抽象
#ifndef PRODUCT_H
#define PRODUCT_H
#include <map>
#include <string>
class Product{
public:
    std::map<std::string,std::string> itemList;
    void Add(std::string itemIndex,std::string itemContent){
        itemList[itemIndex] = itemContent;
    }
};
#endif // PRODUCT_H
//client点餐
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include "product.h"
#include "director.h"
#include "builder_concrete.h"
int main()
{
    std::cout<<"start build"<<std::endl;
    Builder *builderPtr = new ConcreteBuilder();
    Director* directorPtr = new Director(builderPtr);
    directorPtr->Build();
    Product* productPtr = directorPtr->GetResult();
    if(productPtr->itemList.find("A") != productPtr->itemList.end()){
        std::cout<< "product partA:"<< productPtr->itemList["A"].c_str() << std::endl;
    }
    if(productPtr->itemList.find("B") != productPtr->itemList.end()){
        std::cout << "product partB:"<< productPtr->itemList["B"].c_str() << std::endl;
    }
    std::cout<<"end build"<<std::endl;
    return 0;
}
输出结果：
start build
product partA:薯条
product partB:汉堡
end build