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c++ patterns 2010-11-26 专栏收录该内容

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本文通过C++实现了一个税务计算的责任链模式示例，根据不同收入水平应用不同的税率进行税收计算。涉及类继承与多态使用。

#include <cstdlib>
#include <iostream>
#include <string>
using namespace std;
class Chain
{
protected:
Chain* pNext;
public:
Chain(Chain* p):pNext(p){}
virtual ~Chain(){
    if(pNext){delete pNext;pNext = NULL;}
    cout<<"基类Chain析构"<<endl;
}
virtual void Do(int n) = 0;
};
class ChainA:public Chain
{
public:
ChainA(Chain* p):Chain(p){}
virtual ~ChainA(){cout<<"子类ChainA析构"<<endl;}
virtual void Do(int n){
    if(n < 2000){
      cout<<"对不起，您收入太低，暂时还不需要交税！"<<endl;
    }else{
      pNext->Do(n);
    }
}
};
class ChainB:public Chain
{
public:
ChainB(Chain* p):Chain(p){}
virtual ~ChainB(){cout<<"子类ChainB析构"<<endl;}
virtual void Do(int n){
    if(n < 4000){
      cout<<"您需要交的税款为:"<<n<<" * 0.05 = "<<n * 0.05f<<endl;
    }else{
      pNext->Do(n);
    }
}
};
class ChainC:public Chain
{
public:
ChainC(Chain* p):Chain(p){}
virtual ~ChainC(){cout<<"子类ChainC析构"<<endl;}
virtual void Do(int n){
    if(n > 4000){
      cout<<"您是地主吧，您需要交的税款为:"<<n<<" * 0.2 = "<<n * 0.2f<<endl;
    }else{
      pNext->Do(n);
    }
}
};
Chain* pShui = new ChainA(new ChainB(new ChainC(NULL)));
void JiaoShui(string name,int nMoney)
{
cout<<name<<":";
pShui->Do(nMoney);
}
int main(int argc, char *argv[])
{
    JiaoShui("wch",1500);
    JiaoShui("hyc",2500);
    JiaoShui("tzh",4500);
    delete pShui;
    system("PAUSE");
    return EXIT_SUCCESS;
}