建造者模式

建造者把產(chǎn)品細(xì)節(jié)的實(shí)現(xiàn)過(guò)程單獨(dú)封裝成類，完成產(chǎn)品本身和創(chuàng)建產(chǎn)品之間的解耦。每一個(gè)建造者都相對(duì)獨(dú)立，因此在建造細(xì)節(jié)實(shí)現(xiàn)方面實(shí)現(xiàn)了靈活性和可擴(kuò)展性。

建造者模式和工廠模式的區(qū)別：工廠模式關(guān)心把這個(gè)產(chǎn)品創(chuàng)建出來(lái)，而不關(guān)心其細(xì)節(jié)；建造者模式不僅需要把產(chǎn)品生產(chǎn)出來(lái)，還需要關(guān)心生產(chǎn)細(xì)節(jié)。

建造者的核心在于將建造者獨(dú)立成不同的子類，以實(shí)現(xiàn)建造過(guò)程的靈活性和可擴(kuò)展性。文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-820805.html

示例代碼

#include<iostream>
#include<string>
using namespace std;


class Meal{
public:
    void setBurger(string str){
        burger = str;
    }
    void setFries(string str){
        fries = str;
    }
    void setDrink(string str){
        drink = str;
    }
    void print(){
        std::cout << burger << std::endl;
        std::cout << fries << std::endl;
        std::cout << drink << std::endl;
    }
private:
    string burger;
    string fries;
    string drink;
};
class MealBuilder{
public:
    virtual void buildBurger(){}
    virtual void buildFries(){}
    virtual void buildDrink(){}
    virtual Meal* getMeal(){
        return meal;
    }

    Meal* meal = new Meal();
};
class ChickenMealBuilder : public MealBuilder{
public:
    void buildBurger(){
        meal->setBurger("雞肉漢堡");
    }
    void buildFries(){
        meal->setFries("中份薯?xiàng)l");
    }
    void buildDrink(){
        meal->setDrink("大杯果汁");
    }
};
class BeefBurgerMealBuilder : public MealBuilder{
public:
    void buildBurger(){
        meal->setBurger("牛肉漢堡");
    }
    void buildFries(){
        meal->setFries("大份薯?xiàng)l");
    }
    void buildDrink(){
        meal->setDrink("中杯可樂(lè)");
    }
};
class ShrimpMealBuilder : public MealBuilder{
public:
    void buildBurger(){
        meal->setBurger("蝦肉漢堡");
    }
    void buildFries(){
        meal->setFries("小份薯?xiàng)l");
    }
    void buildDrink(){
        meal->setDrink("大杯芬達(dá)");
    }
};
class MealDirector{
public:
    void setMealBuilder(MealBuilder* mealBuilder){
        this->mealBuilder = mealBuilder;
    }
    Meal* getMeal(){ return mealBuilder->getMeal(); }
    void constructMeal(){
        mealBuilder->buildBurger();
        mealBuilder->buildFries();
        mealBuilder->buildDrink();
    }
private:
    MealBuilder* mealBuilder;
};
int main(){
    MealDirector* director = new MealDirector();
    director->setMealBuilder(new BeefBurgerMealBuilder());
    director->constructMeal();
    Meal* meal = director->getMeal();
    meal->print();
}

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