设计模式之简单工厂模式，C++实现

原创http://blog.csdn.net/iuhsihsow

只上图和代码吧

#include "stdafx.h" #include  <windows.h>   enum EOperator { ADD_OPER, SUB_OPER };  class MathOperator { public: MathOperator(){;} virtual ~MathOperator(){;}  void SetMember(int first, int second) { m_nFirst = first; m_nSecond = second; } virtual int GetResult() = 0; protected: int m_nFirst; int m_nSecond; };   class AddOperator:public MathOperator { public: int GetResult() { return m_nFirst + m_nSecond; } };   class SubOperator:public MathOperator { public: int GetResult() { return m_nFirst - m_nSecond; } };  class OperatorFactory { public: MathOperator *CreateOperator(EOperator eOper) { MathOperator *pOper = NULL; switch (eOper) { case ADD_OPER: pOper = new AddOperator(); break; case SUB_OPER: pOper = new SubOperator(); break; } return pOper; } };   int _tmain(int argc, _TCHAR* argv[]) { OperatorFactory OFactrory; MathOperator *pOper = OFactrory.CreateOperator(ADD_OPER); pOper->SetMember(2, 3); int nResult = pOper->GetResult(); if (pOper) { delete pOper; pOper = NULL; } return 0; }