設計模式(1)--簡單原廠模式

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//ver1class Operation{public:static double GetResult(double A, double B, char operate){double result = 0;switch(operate){case ‘+‘:result = A + B;break;case ‘-‘:result = A - B;break;default:break;}return result;}};void main1(){double A = 1.1;double B = 2.2;char oper = ‘+‘;double result = Operation::GetResult(A, B, oper);}

 

//ver2class Operation{public:Operation(){}~Operation(){}protected:double _NumberA;double _NumberB;public:void SetNumberA(double A){_NumberA = A;}double GetNumberA(){return _NumberA;}void SetNumberB(double B){_NumberB = B;}double GetNumberB(){return _NumberB;}virtual double GetResult(){double result = 0;return result;}};class OperationAdd : public Operation{public:virtual double GetResult(){double result = _NumberA + _NumberB;return result;}};class OperationSub : public Operation{public:virtual double GetResult(){double result = _NumberA - _NumberB;return result;}};//工廠class OperationFactory{public:static Operation CreateOperate(char operate){Operation *oper = NULL;switch(operate){case ‘+‘:oper = new OperationAdd();break;case ‘-‘:oper = new OperationSub();break;default:break;}return *oper;}};void main2(){Operation oper;oper = OperationFactory::CreateOperate(‘+‘);oper.SetNumberA(1.1);oper.SetNumberB(2.2);double result = oper.GetResult();}

　　

　

設計模式(1)--簡單原廠模式