C++设计模式从0进击-1-简单（静态）工厂模式

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简单工厂模式的工厂类一般是使用静态方法，通过接收的参数的不同来返回不同的对象实例。

不修改代码的话，是无法扩展的。

#include <iostream>using namespace std;class COperation{public:int m_nFirst;int m_nSecond;virtual double GetResult(){double dResult = 0;return dResult;}};//加法class AddOperation: public COperation{virtual double GetResult(){return m_nFirst+ m_nSecond;}};//减法class SubOperation: public COperation{public:virtual double GetResult(){return m_nFirst - m_nSecond;}};

//工厂类

class CCaculatorFactory{public:static COperation * Create(char cOperator);};COperation * CCaculatorFactory::Create(char cOperator){COperation * oper;switch(cOperator){case '+':oper = new AddOperation();break;case '-':oper = new SubOperation();break;default:oper = new AddOperation();break;}return oper;}

int _tmain(int argc, _TCHAR * argv []){         int a, b;         cin >> a >> b;         COperation * op = CCaculatorFactory::Create('-');         op->m_nFirst = a;         op->m_nSecond = b;         cout << op->GetResult() << endl;         return 0;}

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