用C++学习设计模式之简单工厂模式

拿到了《大话设计模式》这本书，，从这本书的风格来看，感觉这本书还是非常适合大学教育的。但是对于初学者来讲，C#是不太容易接受的。为了解决这个问题，同时为了提升自己的C++水平以及加深对面向对象的理解，笔者决定用C++学习一下这本书。#ifndef OPERATION_H#define OPERATION_Hclass Operation{public:Operation();virtual ~Operation();void set_numberA(double _numberA);void set_numberB(double _numberB);double get_numberA();double get_numberB();double virtual get_result();protected:double numberA;double numberB;private:};#endif // OPERATION_H运算类.cpp文件#include "Operation.h"Operation::Operation(){//ctornumberA = 0;numberB = 0;}Operation::~Operation(){//dtor}void Operation::set_numberA(double _numberA){numberA = _numberA;}void Operation::set_numberB(double _numberB){numberB = _numberB;}double Operation::get_numberA(){return this->numberA;}double Operation::get_numberB(){return this->numberB;}double Operation::get_result(){return 0.0;}然后是+、-、*、/四个类分别继承运算类#ifndef OPERATIONADD_H#define OPERATIONADD_H#include"Operation.h"class OperationAdd:public Operation{public:double get_result();protected:private:};#endif // OPERATIONADD_H#include "OperationAdd.h"double OperationAdd::get_result(){double result = 0;result = numberA + numberB;return result;}#ifndef OPERATIONSUB_H#define OPERATIONSUB_H#include"Operation.h"class OperationSub:public Operation{public:double get_result();protected:private:};#endif // OPERATIONSUB_H#include "OperationSub.h"double OperationSub::get_result(){double result = 0;result = numberA – numberB;return result;}

#ifndef OPERATIONMUL_H#define OPERATIONMUL_H#include"Operation.h"class OperationMul:public Operation{public:double get_result();protected:private:};#endif // OPERATIONMUL_H#include "OperationMul.h"double OperationMul::get_result(){double result = 0;result = numberA*numberB;return result;}

#ifndef OPERATIONDIV_H#define OPERATIONDIV_H#include"Operation.h"class OperationDiv:public Operation{public:double get_result();protected:private:};#endif // OPERATIONDIV_H#include "OperationDiv.h"double OperationDiv::get_result(){double result = 0;result = numberA/numberB;return result;}

然后是一个工厂类

#ifndef OPERATIONFACTORY_H#define OPERATIONFACTORY_H#include"Operation.h"#include"OperationAdd.h"#include"OperationSub.h"#include"OperationMul.h"#include"OperationDiv.h"class OperationFactory{public:static Operation *CreateOperation(char ch);OperationFactory();virtual ~OperationFactory();protected:private:};#endif // OPERATIONFACTORY_H#include "OperationFactory.h"OperationFactory::OperationFactory(){//ctor}OperationFactory::~OperationFactory(){//dtor}Operation *OperationFactory::CreateOperation(char ch){Operation *oper;switch(ch){case '+':oper = new OperationAdd();break;case '-':oper = new OperationSub();break;case '*':oper = new OperationMul();break;case '/':oper = new OperationDiv();break;}return oper;}

最后是主类

#include <iostream>#include"Operation.h"#include"OperationAdd.h"#include"OperationSub.h"#include"OperationMul.h"#include"OperationDiv.h"#include"OperationFactory.h"using namespace std;int main(){Operation* oper;oper = OperationFactory::CreateOperation('*');oper->set_numberA(1);oper->set_numberB(2);cout<<oper->get_result();return 0;}

对于旅行，从来都记忆模糊。记不得都去了哪些地方，

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