策略模式 + 简单工厂模式

来源：互联网发布：cf一直网络出现异常编辑：程序博客网时间：2024/06/11 01:40

《大话设计模式》实现代码

//cash.h#ifndef _CASH_H_#define _CASH_H_#include <string>using namespace std;class CashSuper{    public:        CashSuper() {}        virtual ~CashSuper() {}        virtual double acceptCash(double money) {}    };class CashNormal: public CashSuper{    public:        double acceptCash(double money);};class CashReturn: public CashSuper{    public:        CashReturn(double condition = 0.0, double re = 0.0):moneyCondition(condition), moneyReturn(re) {}        ~CashReturn() {}        double acceptCash(double money);    private:        double moneyCondition;        double moneyReturn;};class CashRebate: public CashSuper{    public:        CashRebate(double rate = 1.0): cashRate(rate) {}        ~CashRebate() {}        double acceptCash(double money);    private:        double cashRate;};class CashContext{    public:        CashContext(const string &type);        ~CashContext();        double getResult(double money);        void setType(const string &type);    private:        void setCash(const string &type);        CashSuper *cs;};CashContext::CashContext(const string &type):cs(NULL){    this->setCash(type);}CashContext::~CashContext(){    if(cs != NULL)    {        delete cs;        cs = NULL;    }}void CashContext::setType(const string &type){    this->setCash(type);}void CashContext::setCash(const string &type){    if(type.compare("Normal") == 0)        cs = new CashNormal();    else if(type.compare("Return") == 0)        cs = new CashReturn(300.0, 100.0);    else if(type.compare("Rebate") == 0)        cs = new CashRebate(0.8);    else        cs = NULL;}double CashContext::getResult(double money){    if(cs != NULL)        return cs->acceptCash(money);    return 0;}double CashNormal::acceptCash(double money){    return money;}double CashReturn::acceptCash(double money){    double result = money;    if(result >= this->moneyCondition && this->moneyCondition > 0)        result -= (double)((int) (result / this->moneyCondition)) * this->moneyReturn;    return result;}double CashRebate::acceptCash(double money){    return money * cashRate;}#endif

#include <iostream>#include <cstdio>#include <string>#include "cash.h"using namespace std;int main(){       string type1("Normal");    string type2("Return");    string type3("Rebate");    double price = 80;    int num = 10;    CashContext context(type1);    printf("The total money is: %.2lf\n", price * num);    printf("Noraml strategy: %.2lf\n", context.getResult(price * num));    context.setType(type2);    printf("Return strategy: %.2lf\n", context.getResult(price * num));    context.setType(type3);    printf("Rebate strategy: %.2lf\n", context.getResult(price * num));      return 0;}