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文章目录

系列文章目录前言一、单例模式1.饿汉式2.懒汉式 二、工厂模式1.简单工厂2.工厂模式3.抽象工厂模式 三、代理模式总结

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前言

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一、单例模式

1.饿汉式

class SingleTon{ public: static SingleTon* getInstance(){ return instance; } private: Singleton(){} static Singleton* instance; }; Singleton* Singleton::instance = new Singleton;

2.懒汉式

class Singleton{ public: static Singleton* getInstance(){ if(NULL == instance){ instance = new Singleton; } return instance; } private: Singleton(){} static Singleton* instance; }; Singleton* Singleton::instance = NULL;

二、工厂模式

1.简单工厂

class fruit{ public: virtual void name() = 0; }; class apple:public fruit{ public: virtual void name(){ cout << "apple" << endl; } }; class pear:public fruit{ public: virtual void name(){ cout << "pear" << endl; } }; class Factory{ public: fruit* createFruit(string name){ if(name == "apple") return new apple; else if(name == "pear") return new pear; } }; int main() { Factory* fac = new Factory; fruit* apple = fac->createFruit("apple"); apple->name(); return 0; }

2.工厂模式

class fruit{ public: virtual void name() = 0; }; class apple :public fruit{ public: virtual void name(){ cout << "apple" << endl; } }; class pear :public fruit{ public: virtual void name(){ cout << "pear" << endl; } }; class Factory{ public: virtual fruit* createFruit() = 0; }; class appleFactory :public Factory{ public: fruit* createFruit(){ return new apple; } }; class pearFactory :public Factory{ public: fruit* createFruit(){ return new pear; } }; int main() { Factory* fac = new appleFactory; fruit* apple = fac->createFruit(); apple->name(); return 0; }

3.抽象工厂模式

//例子：电脑配置CPU、显卡、内存，配置一台intel的CPU、内存，kinton的显卡 class CPU{ public: virtual void calc() = 0; }; class CARD{ public: virtual void display() = 0; }; class MEMORY{ public: virtual void storage() = 0; }; class Factory{ public: virtual CPU* createCpu() = 0; virtual CARD* createCard() = 0; virtual MEMORY* createMemory() = 0; }; class computer{ public: computer(CPU* cpu, CARD* card, MEMORY* mem){ this->cpu = cpu; this->card = card; this->mem = mem; } void work(){ cpu->calc(); card->display(); mem->storage(); } private: CPU* cpu; CARD* card; MEMORY* mem; }; //------------------ //intel的配置 class IntelCPU :public CPU{ public: void calc(){ cout << "intelCPU 开始计算.." << endl; } }; class IntelCARD :public CARD{ public: void display(){ cout << "intelCARD 开始显示.." << endl; } }; class IntelMEMORY :public MEMORY{ public: void storage(){ cout << "intelMEMORY 开始存储.." << endl; } }; class IntelFactory :public Factory{ public: virtual CPU* createCpu(){ return new IntelCPU; } virtual CARD* createCard(){ return new IntelCARD; } virtual MEMORY* createMemory(){ return new IntelMEMORY; } }; //Kinton的配置 class KintonCPU :public CPU{ public: void calc(){ cout << "KintonCPU 开始计算.." << endl; } }; class KintonCARD :public CARD{ public: void display(){ cout << "KintonCARD 开始显示.." << endl; } }; class KintonMEMORY :public MEMORY{ public: void storage(){ cout << "KintonMEMORY 开始存储.." << endl; } }; class KintonFactory :public Factory{ public: virtual CPU* createCpu(){ return new KintonCPU; } virtual CARD* createCard(){ return new KintonCARD; } virtual MEMORY* createMemory(){ return new KintonMEMORY; } }; int main() { Factory* intelFac = new IntelFactory; CPU* intelCpu = intelFac->createCpu(); MEMORY* intelMem = intelFac->createMemory(); Factory* kintonFac = new KintonFactory; CARD* kintonCard = kintonFac->createCard(); computer* com = new computer(intelCpu, kintonCard, intelMem); com->work(); return 0; }

三、代理模式

class item{ public: item(string name, bool real){ this->name = name; this->real = real; } string getName(){ return name; } bool isReal(){ return real; } private: string name; bool real; }; class Shopping{ public: virtual void buy(item* it) = 0; }; class usaShopping :public Shopping{ public: void buy(item* it){ cout << "在美国买了" << it->getName() << endl; } }; class chinaShopping :public Shopping{ public: void buy(item* it){ cout << "在中国买了" << it->getName() << endl; } }; class proxyShopping :public Shopping{ public: proxyShopping(Shopping* s) :shop(s){} void buy(item* it){ if (it->isReal()){ cout << "是正牌货，可买" << endl; shop->buy(it); cout << "成功买回" << endl; } else{ cout << "假货，不买了" << endl; } } private: Shopping* shop; }; int main() { item* it = new item("nike", true); Shopping* usaShop = new usaShopping; Shopping* proxyShop = new proxyShopping(usaShop); proxyShop->buy(it); return 0; }

总结

下次一定