/**
 * @name 建造者模式
 * @brief: 分步构造复杂对象
 * @note 场景：创建包含多个配置选项的对象（如电脑配置、订单）
 */

class Pizza {
public:
    void setDough(const std::string& d) { dough = d; }
    void setSauce(const std::string& s) { sauce = s; }
    void addTopping(const std::string& t) { toppings.push_back(t); }
private:
    std::string dough;
    std::string sauce;
    std::vector<std::string> toppings;
};

class PizzaBuilder {
public:
    virtual void buildDough() = 0;
    virtual void buildSauce() = 0;
    virtual void buildToppings() = 0;
    Pizza* getPizza() { return pizza; }
protected:
    Pizza* pizza = new Pizza();
};

class HawaiianBuilder : public PizzaBuilder {
public:
    void buildDough() override { pizza->setDough("cross"); }
    void buildSauce() override { pizza->setSauce("mild"); }
    void buildToppings() override {
        pizza->addTopping("ham");
        pizza->addTopping("pineapple");
    }
};

class Director {
public:
    Pizza* makePizza(PizzaBuilder* builder) {
        builder->buildDough();
        builder->buildSauce();
        builder->buildToppings();
        return builder->getPizza();
    }
};

// 使用
int main()
{
    Director director;
    HawaiianBuilder builder;
    Pizza* pizza = director.makePizza(&builder);
}