A brief introduction to the builder pattern in C++ design patterns

Builder pattern (Builder): Separates the construction of a complex object from its representation, so that the same construction process can create different representations.

Pattern implementation:

[code]class Builder;
//产品
class Product{
public:
    void AddPart(const char *info){
        m_PartInfoVec.push_back(info);
    }
    void ShowProduct(){
        for(std::vector<const char *>::iterator item = m_PartInfoVec.begin(); item != m_PartInfoVec.end(); ++item){
            std::cout << *item << std::endl;
        }
    }
private:
    std::vector<const char *> m_PartInfoVec;
};

//Builder建造者,统一抽象接口
class Builder{
public:
    virtual void BuildPartA(){}
    virtual void BuildPartB(){}
    virtual Product* GetProduct() { return NULL;}
};

//具体的被创建对象方法
class ConcreteBuilder:public Builder{
public:
    ConcreteBuilder(){ m_Product = new Product(); }
    void BuildPartA(){
        m_Product->AddPart("PartA completed");
    }
    void BuildPartB(){
        m_Product->AddPart("PartB q");
    }
    Product* GetProduct(){
        return m_Product;
    }
private:
    Product *m_Product;
};

//Director控制具体建造对象的创建
class Director{
public:
    Director(Builder *builder) { m_Builder = builder; }
    void CreateProduct(){
        m_Builder->BuildPartA();
        m_Builder->BuildPartB();
    }
private:
    Builder *m_Builder;
};

Client:

[code]int main(){
    Builder *builderObj =  new ConcreteBuilder();

    Director directorObj(builderObj);
    directorObj.CreateProduct();

    Product *productObj = builderObj->GetProduct();

    if(productObj == NULL)
    {
        return 0;
    }
    productObj->ShowProduct();

    delete productObj;
    productObj = NULL;
    delete builderObj;
    builderObj = NULL;
}

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