C++設計模式淺識建造者模式

建造者模式(Builder)：將一個複雜物件的構建與它的表示分離，使得同樣的構建過程可以建立不同的表示。

模式實現：

[code]class Builder;//產品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,統一抽象介面class Builder{public:    virtual void BuildPartA(){}    virtual void BuildPartB(){}    virtual Product* GetProduct() { return NULL;}};//具體的被建立對象方法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控制具體建造對象的建立class Director{public:    Director(Builder *builder) { m_Builder = builder; }    void CreateProduct(){        m_Builder->BuildPartA();        m_Builder->BuildPartB();    }private:    Builder *m_Builder;};

用戶端：

[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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