基于c++的策略模式初探。

最新推荐文章于 2016-10-29 10:42:05 发布

原创最新推荐文章于 2016-10-29 10:42:05 发布 · 780 阅读

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#c++ #设计模式

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本文介绍了一种基于抽象类的计费模式设计方法，通过定义抽象基类AbsAccount及派生类HalfAccount和PromoteAccount实现不同的计费策略。HalfAccount提供五折优惠，而PromoteAccount则针对超过100元的部分减免60元。此外，还提供了一个工厂类AccountFactory用于创建不同类型的计费对象。

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#ifndef ABSACCOUNT_H
#define ABSACCOUNT_H
class AbsAccount {
public:
virtual double getTotalPrice(double unitPrice,int counts)=0;
virtual ~AbsAccount(){

}//need define when declare.

};

#endif // ABSACCOUNT_H

#ifndef HALFACCOUNT_H
#define HALFACCOUNT_H
#include "AbsAccount.h"
class HalfAccount : public AbsAccount{
public:
HalfAccount();

virtual double getTotalPrice(double unitPrice,int counts);

~HalfAccount(){
}

};
#endif // HALFACCOUNT_H

#include "HalfAccount.h"
double HalfAccount::getTotalPrice(double unitPrice,int counts){
return unitPrice*0.5*counts;

}

HalfAccount::HalfAccount():AbsAccount(){

}

#ifndef PROMOTEACCOUNT_H
#define PROMOTEACCOUNT_H
#include "AbsAccount.h"
class PromoteAccount : public AbsAccount{
public:
PromoteAccount();

virtual double getTotalPrice(double unitPrice,int counts);

~PromoteAccount(){
}

};

#endif // PROMOTEACCOUNT_H

#include "PromoteAccount.h"
double PromoteAccount::getTotalPrice(double unitPrice,int counts){
double d= unitPrice*counts;

if(d>100)
d=d-60;
return d;
}

PromoteAccount::PromoteAccount():AbsAccount(){

}

#ifndef ACCOUNTFACTORY_H
#define ACCOUNTFACTORY_H
#include "AbsAccount.h"
class AccountFactory{
public:
static AbsAccount* createAccount(int type_id);

static const int TYPE_HALF_ACCOUNT=1;
static const int TYPE_PROMOTE_ACCOUNT=2;

};

#endif // ACCOUNTFACTORY_H

#include "AccountFactory.h"
#include "HalfAccount.h"
#include "PromoteAccount.h"
AbsAccount* AccountFactory::createAccount(int type_id){
    switch(type_id){
    case TYPE_HALF_ACCOUNT:
        return new HalfAccount;
    case TYPE_PROMOTE_ACCOUNT:
        return new PromoteAccount;
    default:
        return 0;

}

#include "AccountFactory.h"
#include <iostream>
using namespace std;
int main(){
    double total1,total2;
    AbsAccount* promoteimpl=0;
    AbsAccount* halfimpl=0;

    halfimpl=AccountFactory::createAccount(AccountFactory::TYPE_HALF_ACCOUNT);
    if(!halfimpl)
        goto exit;
total1=halfimpl->getTotalPrice(10,10);

cout<<"total1:"<<total1<<endl;

delete halfimpl;
promoteimpl=AccountFactory::createAccount(AccountFactory::TYPE_PROMOTE_ACCOUNT);
if(!promoteimpl)
goto exit;
total2=promoteimpl->getTotalPrice(10,10);
cout<<"total2:"<<total2<<endl;
delete promoteimpl;
exit:
return 0;
}