设计模式之建造者模式(C++实现)

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这两天工作不忙，抽空学习了设计模式中的建造者模式，感觉《设计模式---可复用面向对象软件的基础》这本书不适合我看，有些东西写的太杂，反正我是没心情一点点的看，所以又买了一本《大话设计模式》，对于设计模式的学习今天看了一篇文章说：学习设计模式最主要的是记住模式的应用场景和UML图，深有感触，设计模式的思想靠死记硬背确实不是容易记住，好了，发发牢骚，言归正传，下面的对今天设计模式的总结以及对设计模式理解的代码实现。

建造者模式：将一个复杂的对象的构建和表示区分开来。最主要的特征了对象的创建必须按照一定的流程，指挥者使用建造者按照这个流程创建对象，该流程不可变，建造者在建造具体对象的细节是可变的，也就是对象的表示。

ifndef BUILDER_H_#define BUILDER_H_#include "product.h"class builder{//按照统一步骤构建产品，但是产品的构建过程对客户不可见，这样就可以创建不一样的产品，将对象的构建和它的表示实现分离的目的public:virtual void buildPartA(){};virtual void buildPartB(){};virtual void buildPartC(){};public:Product *product;};class ConcreteBuilderFat : public builder{public:ConcreteBuilderFat();~ConcreteBuilderFat();void buildPartA();void buildPartB();void buildPartC();Product * GetResult();};class ConcreteBuilderThin : public builder{public:ConcreteBuilderThin();~ConcreteBuilderThin();void buildPartA();void buildPartB();void buildPartC();Product * GetResult();};#endif

builder.cpp

#include "builder.h"void ConcreteBuilderFat::buildPartA(){product->SetPartA("胖子头");}void ConcreteBuilderFat::buildPartB(){product->SetPartB("胖子身子");}void ConcreteBuilderFat::buildPartC(){product->SetPartC("胖子脚");}Product* ConcreteBuilderFat::GetResult(){return this->product;}ConcreteBuilderFat::ConcreteBuilderFat(){product = new Product();}ConcreteBuilderFat::~ConcreteBuilderFat(){delete product;product = NULL;}void ConcreteBuilderThin::buildPartA(){product->SetPartA("瘦子头");}void ConcreteBuilderThin::buildPartB(){product->SetPartB("瘦子身子");}void ConcreteBuilderThin::buildPartC(){product->SetPartC("瘦子脚");}Product* ConcreteBuilderThin::GetResult(){return this->product;}ConcreteBuilderThin::ConcreteBuilderThin(){product = new Product();}ConcreteBuilderThin::~ConcreteBuilderThin(){delete product;product = NULL;}

Product.h

#ifndef PRODUCT_H_#define PRODUCT_H_#include <iostream>class Product{public:void SetPartA(std::string str){ partA = str; }void SetPartB(std::string str){ partB = str; };void SetPartC(std::string str){ partC = str; }void ShowPartA(){ std::cout << partA.c_str() << std::endl; }void ShowPartB(){ std::cout << partB.c_str() << std::endl; }void ShowPartC(){ std::cout << partC.c_str() << std::endl; }private:std::string partA,partB,partC;};#endif

Director.h

#ifndef DIRECTOR_H_#define DIRECTOR_H_#include"builder.h"class Director{public:void Construct();void SetBuilder(builder *);private:builder* m_builder;};#endif

Director.cpp

#include "Director.h"void Director::Construct(){m_builder->buildPartA();m_builder->buildPartB();m_builder->buildPartC();}void Director::SetBuilder(builder * builder){m_builder = builder;}

main.cpp

#include "Director.h"int main(){ConcreteBuilderFat *mBuilderfat = new ConcreteBuilderFat();Director dir;dir.SetBuilder(mBuilderfat);dir.Construct();Product *fat = mBuilderfat->GetResult();fat->ShowPartA();fat->ShowPartB();fat->ShowPartC();ConcreteBuilderThin * mbuilderThin = new ConcreteBuilderThin();dir.SetBuilder(mbuilderThin);dir.Construct();Product* thin = mbuilderThin->GetResult();thin->ShowPartA();thin->ShowPartB();thin->ShowPartC();delete mBuilderfat;delete mbuilderThin;//调用指挥者同样的构建过程Construct，可以创建不一样的对象，这就是讲对象的构建和表示分开，对象总是按照统一的步骤构建的return 0;}

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