设计模式1——抽象工厂
抽象工厂通过一个工厂产生各种不同的实际对象,并返回基类的指针,通过基类的指针来统一对对象进行操作,增强了其灵活性,降低了耦合,便于后续更新和维护。
实例代码:
AbstractFactory.h内容
1 #ifndef AbstractFactory_H_H 2 #define AbstractFactory_H_H 3 4 #include <iostream> 5 using namespace std; 6 7 class Oper 8 { 9 public: 10 Oper(int a0, int b0) : a(a0), b(b0) {} 11 virtual ~Oper() {} 12 virtual int getResult() = 0; 13 14 15 protected: 16 int a, b; 17 }; 18 19 class OperAdd : public Oper 20 { 21 public: 22 OperAdd(int a0, int b0) : Oper(a0, b0) {} 23 virtual int getResult(){ 24 return a+b; 25 } 26 }; 27 28 class OperSub : public Oper 29 { 30 public: 31 OperSub(int a0, int b0) : Oper(a0, b0) {} 32 virtual int getResult(){ 33 return a-b; 34 } 35 }; 36 37 class AbstractFactory 38 { 39 public: 40 static Oper* create(int a0, int b0, char ch){ 41 Oper *oper = NULL; 42 switch(ch){ 43 case '+': oper = new OperAdd(a0, b0); break; 44 case '-': oper = new OperSub(a0, b0); break; 45 } 46 return oper; 47 } 48 }; 49 50 51 void AbstractFactoryTest() 52 { 53 int a = 4, b = 3; 54 //Oper *oper = NULL; 55 cout << AbstractFactory::create(a, b, '+')->getResult() << endl; 56 cout << AbstractFactory::create(a, b, '-')->getResult() << endl; 57 } 58 59 60 #endif
具体运行在main函数中调用AbstractFactoryTest()即可。