C++ Builder 模式实现

内容目录
#include <iostream>
#include <string>

// Pizza类
class Pizza {
public:
    std::string dough;
    std::string sauce;
    std::string topping;

    void makePizza() {
        std::cout << "Making pizza with " << dough << " dough, " << sauce << " sauce and " << topping << " topping." << std::endl;
    }
};

// PizzaBuilder接口
class PizzaBuilder {
public:
    virtual void buildDough() = 0;
    virtual void buildSauce() = 0;
    virtual void buildTopping() = 0;
    virtual Pizza* getPizza() = 0;
};

// ConcretePizzaBuilder实现
class MargheritaPizzaBuilder : public PizzaBuilder {
private:
    Pizza* pizza;

public:
    MargheritaPizzaBuilder() {
        pizza = new Pizza();
    }

    void buildDough() override {
        pizza->dough = "thin";
    }

    void buildSauce() override {
        pizza->sauce = "tomato";
    }

    void buildTopping() override {
        pizza->topping = "cheese";
    }

    Pizza* getPizza() override {
        return pizza;
    }
};

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

int main() {
    PizzaDirector director;
    MargheritaPizzaBuilder builder;

    Pizza* pizza = director.makePizza(&builder);
    pizza->makePizza();

    delete pizza;

    return 0;
}
打赏作者