54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
/**
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* @name 建造者模式
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* @brief: 分步构造复杂对象
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* @note 场景：创建包含多个配置选项的对象（如电脑配置、订单）
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*/
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class Pizza {
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public:
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void setDough(const std::string& d) { dough = d; }
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void setSauce(const std::string& s) { sauce = s; }
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void addTopping(const std::string& t) { toppings.push_back(t); }
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private:
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std::string dough;
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std::string sauce;
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std::vector<std::string> toppings;
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};
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class PizzaBuilder {
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public:
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virtual void buildDough() = 0;
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virtual void buildSauce() = 0;
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virtual void buildToppings() = 0;
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Pizza* getPizza() { return pizza; }
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protected:
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Pizza* pizza = new Pizza();
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};
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class HawaiianBuilder : public PizzaBuilder {
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public:
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void buildDough() override { pizza->setDough("cross"); }
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void buildSauce() override { pizza->setSauce("mild"); }
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void buildToppings() override {
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pizza->addTopping("ham");
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pizza->addTopping("pineapple");
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}
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};
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class Director {
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public:
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Pizza* makePizza(PizzaBuilder* builder) {
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builder->buildDough();
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builder->buildSauce();
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builder->buildToppings();
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return builder->getPizza();
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}
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};
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// 使用
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int main()
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{
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Director director;
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HawaiianBuilder builder;
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Pizza* pizza = director.makePizza(&builder);
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} |