设计模式-生成器模式

UML符号说明

生成器模式结构-类图示意

代码示例

#include
#include
#include


class Product1{
    public:
    std::vector parts_;
    void ListParts()const{
        std::cout << "Product parts: ";
        for (size_t i=0;iReset();
    }

    ~ConcreteBuilder1(){
        std::cout<<"deconstruct ConcreteBuilder1"<product= new Product1();
    }
    

    void ProducePartA()const override{
        this->product->parts_.push_back("PartA1");
    }

    void ProducePartB()const override{
        this->product->parts_.push_back("PartB1");
    }

    void ProducePartC()const override{
        this->product->parts_.push_back("PartC1");
    }

    

    

    Product1* GetProduct() {
        Product1* result= this->product;
        this->Reset();
        return result;
    }
};


class Director{
    
    private:
    Builder* builder;
    

    public:

    void set_builder(Builder* builder){
        this->builder=builder;
    }

    

    void BuildMinimalViableProduct(){
        this->builder->ProducePartA();
    }
    
    void BuildFullFeaturedProduct(){
        this->builder->ProducePartA();
        this->builder->ProducePartB();
        this->builder->ProducePartC();
    }
};


void ClientCode(Director& director)
{
    ConcreteBuilder1* builder = new ConcreteBuilder1();
    director.set_builder(builder);
    std::cout << "Standard basic product:n"; 
    director.BuildMinimalViableProduct();
    
    Product1* p= builder->GetProduct();
    p->ListParts();
    delete p;

    std::cout << "Standard full featured product:n"; 
    director.BuildFullFeaturedProduct();

    p= builder->GetProduct();
    p->ListParts();
    delete p;

    // Remember, the Builder pattern can be used without a Director class.
    std::cout << "Custom product:n";
    builder->ProducePartA();
    builder->ProducePartC();
    p=builder->GetProduct();
    p->ListParts();
    delete p;

    delete builder;
}

int main(){
    Director* director= new Director();
    ClientCode(*director);
    delete director;
    return 0;    
}

运行结果