C++工厂模式

最新推荐文章于 2025-05-27 22:08:50 发布

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本文介绍了一个使用C++实现的简单工厂模式示例，通过该模式创建不同的数学运算对象。示例中定义了基类Operator及四个派生类分别对应加、减、乘、除四种运算，并实现了相应的工厂类来获取这些运算对象。

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#include <iostream>
#include <string>
using namespace std;

class Operator
{
protected:
 int m_num1;
 int m_num2;
public:
 void set1(int a)
 {
  m_num1=a; 
 }
 void set2(int b)
 {
  m_num2=b;
 }
 int Get1()
 {
  return m_num1;
 }
 int Get2()
 {
  return m_num2;
 }
 virtual int GetResult(){ return 1 ;};
};

class OperatorAdd: public Operator
{
public:
 int  GetResult()
 {
  return m_num1+m_num2;
 }
};

class OperatorSub: public Operator
{
public:
 int GetResult()
 {
  return m_num1-m_num2;
 }
};

class OperatorMul: public Operator
{
public:
 int GetResult()
 {
  return m_num1*m_num2;
 }
};

class OperatorDiv: public Operator
{
public: 
 int GetResult()
 {
  if ( m_num2!=0 )
  {
   return m_num1/m_num2;
  }
  return -1;
 }
};

class IFactory
{
public:
 virtual Operator* GetOperator(){ return NULL;};
};

class AddFactory: public IFactory
{
public:
 Operator* GetOperator()
 {
  return new OperatorAdd;
 }
};

class SubFactory: public IFactory
{
public:
 Operator* GetOperator()
 {
  return new OperatorSub;
 }
};

class MulFactory: public IFactory
{
public:
 Operator* GetOperator()
 {
  return new OperatorMul;
 }
};

class DivFactory: public IFactory
{
public:
 Operator* GetOperator()
 {
  return new OperatorDiv;
 }
};


void main()
{
 IFactory* OperatorFactory=new AddFactory;
 Operator* oper=OperatorFactory->GetOperator();
 oper->set1(5);
 oper->set2(6);
 int ret=oper->GetResult();
 cout<<ret<<endl;
}