C++设计模式-抽象工厂模式
生活随笔
收集整理的這篇文章主要介紹了
C++设计模式-抽象工厂模式
小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.
目錄
?
?
基本概念
代碼與實(shí)例
?
基本概念
抽象工廠模式(Abstract Factory),提供一個(gè)創(chuàng)建一系列相關(guān)或相互依賴對(duì)象的接口,從而無需指定他們具體的類。
抽象工廠的好處:
? ? ? ? ? ?1. 易于交換產(chǎn)品系列,在一個(gè)應(yīng)用中只需要在初始化的時(shí)候出現(xiàn)一次,這就使得改變一個(gè)應(yīng)用的具體工廠變得非常容易,它只需要改變具體工廠即可使用不同的產(chǎn)品配置;
? ? ? ? ? ?2. 讓具體創(chuàng)建實(shí)例過程與客戶端分離,客戶端是通過它們的抽象接口操縱實(shí)例,產(chǎn)品的具體類名也被具體工廠分離,不會(huì)在客戶端代碼中出現(xiàn)
對(duì)應(yīng)的UML圖如下(此圖來源于大話設(shè)計(jì)模式)
?
代碼與實(shí)例
程序運(yùn)行截圖如下:
源碼如下:
Head.h
#ifndef HEAD_H #define HEAD_H#include <iostream> #include <string> using namespace std;typedef string Department; typedef string User;//IUser接口,用于客戶端訪問,解除與具體數(shù)據(jù)庫(kù)訪問耦合 class IUser{public:virtual void insert(User *user) {}virtual User getUser(int id){ return ""; }virtual ~IUser(){} };//SqlserverUser類,用于訪問SQL Server的User class SqlserverUser : public IUser{public:void insert(User *user);User getUser(int id);~SqlserverUser(); };//AccessUser類,用于訪問Access的User class AccssUser : public IUser{public:void insert(User *user);User getUser(int id);~AccssUser(); };//IDepartment接口,用于客戶端訪問,解除與具體數(shù)據(jù)庫(kù)訪問的耦合 class IDepartment{public:virtual void insert(Department *department){}virtual Department *getDepartment(int id){ return nullptr; }virtual ~IDepartment(){} };//SqlServerDepartment類,用于訪問SQL Server的Department class SqlServerDepartment : public IDepartment{public:void insert(Department *department);Department *getDepartment(int id);~SqlServerDepartment(); };//AccessDepartment類,用于訪問Access的Deparment class AccessDepartment : public IDepartment{public:void insert(Department *department);Department *getDepartment(int id);~AccessDepartment(); };//IFactory接口,定義一個(gè)創(chuàng)建訪問Department表對(duì)象的抽象的工廠接口 class IFactory{public:virtual IUser *createUser() { return nullptr; }virtual IDepartment *createDepartment(){ return nullptr; }virtual ~IFactory(){} };//SqlserverFactory類,實(shí)現(xiàn)IFactory接口,實(shí)例化SqlserverUser和SqlserverDepartment class SqlserverFactory : public IFactory{public:IUser *createUser();IDepartment *createDepartment();~SqlserverFactory(); };//AccessFactory類,實(shí)現(xiàn)IFactory接口,實(shí)例化AccessUser和AccessDepartment class AccessFactory : public IFactory{public:IUser *createUser();IDepartment *createDepartment();~AccessFactory(); };#endif //HEAD_HHead.cpp
#include "Head.h"void SqlServerDepartment::insert(Department *department) {cout << "在 SQL Server 中給 Department 表增加一條記錄!" << endl; }Department *SqlServerDepartment::getDepartment(int id) {cout << "在 SQL Server 中根據(jù) ID 得到 Department 表中的一條記錄!" << endl;return nullptr; }SqlServerDepartment::~SqlServerDepartment() {cout << "SqlServerDepartment desconstruction ! " << endl; }void AccessDepartment::insert(Department *department) {cout << "在 Access 中給 Department 表增加一條記錄!" << endl; }Department *AccessDepartment::getDepartment(int id) {cout << "在 Access 中根據(jù) ID 得到 Department 表中的一條記錄!" << endl;return nullptr; }AccessDepartment::~AccessDepartment() {cout << "AccessDepartment desconstruction ! " << endl; }void SqlserverUser::insert(User *user) {cout << "在 SQL Server 中給 User 表增加一條記錄!" << endl; }User SqlserverUser::getUser(int id) {cout << "在 SQL Server 中根據(jù)ID得到 User 表一條記錄!" << endl;return ""; }SqlserverUser::~SqlserverUser() {cout << "SqlserverUser desconstruction ! " << endl; }void AccssUser::insert(User *user) {cout << "在 Access 中給 User 表增加一條記錄!" << endl; }User AccssUser::getUser(int id) {cout << "在 Access 中根據(jù)ID得到 User 表一條記錄!" << endl;return ""; }AccssUser::~AccssUser() {cout << "AccssUser desconstruction ! " << endl; }IUser * SqlserverFactory::createUser() {return new SqlserverUser; }IDepartment * SqlserverFactory::createDepartment() {return new SqlServerDepartment; }SqlserverFactory::~SqlserverFactory() {cout << "SqlserverFactory desconstruction ! " << endl; }IUser * AccessFactory::createUser() {return new AccssUser; }IDepartment * AccessFactory::createDepartment() {return new AccessDepartment; }AccessFactory::~AccessFactory() {cout << "AccessFactory desconstruction ! " << endl; }main.cpp
#include "Head.h"int main(int *argc, int *argv){User *user = new User();Department *department = new Department();IFactory *factory = new SqlserverFactory();//IFactory *factory = new AccessFactory();IUser *iuser = factory->createUser();iuser->insert(user);iuser->getUser(1);IDepartment *iDepartment = factory->createDepartment();iDepartment->insert(department);iDepartment->getDepartment(1);cout << "\n 開始析構(gòu)了!" << endl;delete iDepartment;delete iuser;delete factory;delete user;delete department;cout << "\n------------ 華 麗 的 結(jié) 束 分 割 線 ------------" << endl;getchar();return 0; }?
總結(jié)
以上是生活随笔為你收集整理的C++设计模式-抽象工厂模式的全部?jī)?nèi)容,希望文章能夠幫你解決所遇到的問題。
- 上一篇: C++设计模式-装饰模式
- 下一篇: C++设计模式-访问者模式