C++实现设计模式之 —策略与简单工程结合

策略模式封装算法

// cash.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include<iostream>
#include<string.h>
#include <math.h>
using namespace std;
class CashSuper
{
public:
 virtual double accpetCash(double money)= 0;
};
class CashNormal:public CashSuper
{
public:
 double accpetCash(double money) override
 {
  return money;
 }
};
class CashRebate:public CashSuper
{
public:
 CashRebate(double moneyRebate)
 {
  moneyRebate = moneyRebate;
 }
 double accpetCash(double money) override
 {
  return money * moneyRebate;
 }
private:
 double moneyRebate;
};
class CashReturn:public CashSuper
{
public:
 CashReturn(double moneyCondition,double moneyReturn)
 {
  this->moneyCondition = moneyCondition;
  this->moneyReturn = moneyReturn;
 }
 double accpetCash(double money) override
 {
  double result = money;
  if(money > moneyCondition)
  {
   result = money - floor(money/moneyCondition)*moneyReturn;
   
  }
  return result;
 }
private:
 double moneyCondition;
 double moneyReturn;
};
class CashFactory
{
public:
 static CashSuper *createCashAccpet(char type)
 {
  CashSuper *cs;
  switch(type)
  {
  case '1':
   cs = new CashNormal();
   break;
  case '2':
   cs = new CashReturn(300,100);
   break;
  case '3':
   cs = new CashRebate(0.8);
   break;
  }
  return cs;
 }
};
class CashContext
{
public:
 CashContext(char type)
 {
  switch(type)
  {
  case '1':
   cs = new CashNormal();
   break;
  case '2':
   cs = new CashReturn(300,100);
   break;
  case '3':
   cs = new CashRebate(0.8);
   break;
  }
 }
 CashSuper *cs;
 double GetResult(double money)
 {
  return cs->accpetCash(money);
 }
};

int _tmain(int argc, _TCHAR* argv[])
{
 CashContext csuper('2');
 double result = 0;
 result = csuper.GetResult(500);
 cout<<result<<endl;
 system("pause");
 return 0;
}