《大話設計模式》之 第13章 好菜每回味不同——建造者模式 小結

個人總結：

建造者模式是基於這樣的思想——建造者知道如何?各個部分（Builder類 中成員函數的實現），這些部分是組成產品的工序的分割，需要一個統一的調度者來指定完成生產的工序，並指揮建造者去執行建造（Director類的調度函數ConstructBuilding中指定了Builder類中成員函數PartialConstructA、PartialConstructB的執行順序）。

啥也不說了，上代碼

【Builder基類】

class Builder{public:    Builder(void);    virtual ~Builder(void);    virtual void PartialConstructA(void) = 0;    virtual void PartialConstructB(void) = 0;};Builder::Builder(void){}Builder::~Builder(void){    }

【具體的兩個建造者類】

class BuilderOne : public Builder{public:    BuilderOne(void);    ~BuilderOne(void);    void PartialConstructA(void);    void PartialConstructB(void);};BuilderOne::BuilderOne(void){    }BuilderOne::~BuilderOne(void){    }void BuilderOne::PartialConstructA(void){    std::cout << "====BuilderOne::PartialConstructA====\n";}void BuilderOne::PartialConstructB(void){    std::cout << "====BuilderOne::PartialConstructB====\n";}

class BuilderTwo : public Builder{public:    BuilderTwo(void);    ~BuilderTwo(void);    void PartialConstructA(void);    void PartialConstructB(void);};BuilderTwo::BuilderTwo(void){    }BuilderTwo::~BuilderTwo(void){    }void BuilderTwo::PartialConstructA(void){    std::cout << "====BuilderTwo::PartialConstructA====\n";}void BuilderTwo::PartialConstructB(void){    std::cout << "====BuilderTwo::PartialConstructB====\n";}

【調度者類Director】

class Director{public:    Director(void);    ~Director(void);    void ConstructBuilding(Builder* builder);};Director::Director(void){    }Director::~Director(void){    }void Director::ConstructBuilding(Builder *builder){    //按照既定的順序執行建造    builder->PartialConstructA();    builder->PartialConstructB();}

【main】

int main(int argc, const char * argv[]){    BuilderOne* builderOne = new BuilderOne();    BuilderTwo* builderTwo = new BuilderTwo();        Director* director = new Director();        director->ConstructBuilding(builderOne);    director->ConstructBuilding(builderTwo);        delete builderOne;    builderOne = NULL;        delete builderTwo;    builderTwo = NULL;        delete director;    director = NULL;        return 0;}

【結果】

====BuilderOne::PartialConstructA====

====BuilderOne::PartialConstructB====

====BuilderTwo::PartialConstructA====

====BuilderTwo::PartialConstructB====