C++设计模式学习笔记六：原型模式

1、原型模式：用原型实例指定对象的种类，并且通过拷贝这些原型创建新的对象。

原型模式就是从一个对象创建另一个可定制的对象，而且不需要知道任何创建的细节。

除了需关注原型设计模式的特点和使用场景外，还需关注大话设计模式中所说的深拷贝和浅拷贝。他们之间的区别可以细看下面的C++代码。

2、类图：

3、C++代码：

// PrototypePattern.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;

class IClone
{
public:
 virtual void* Clone() = 0;
};

class WorkExperience : IClone
{
public:
 std::string m_sWorkDate;
 std::string m_sCompany;

 void* Clone()
 {
  WorkExperience* we = new WorkExperience();
  we->m_sWorkDate = m_sWorkDate;
  we->m_sCompany = m_sCompany;
  return we;
 }
};

class Resume : IClone
{
public:
 Resume(){}
 ~Resume(){ delete m_pWe; }

 Resume(std::string strName)
 { 
  m_sName = strName;
  m_pWe = new WorkExperience();
 }

 Resume(WorkExperience* we)
 {
  //m_pWe = we;
  m_pWe = (WorkExperience*)we->Clone();
 }

 void SetPersonalInfo(std::string strAge, std::string strSex)
 {
  m_sAge = strAge;
  m_sSex = strSex;
 }

 void SetWorkExperience(std::string strDate, std::string strCompany)
 {
  m_pWe->m_sWorkDate = strDate;
  m_pWe->m_sCompany = strCompany;
 }

 void DisplayInfo()
 {
  cout<<m_sName<<" "<<m_sSex<<" "<<m_sAge<<endl;
  cout<<"工作经历："<<m_pWe->m_sWorkDate<<" "<<m_pWe->m_sCompany<<endl;
 }

 void* Clone()
 {
  Resume* res = new Resume(this->m_pWe);

  res->m_sName = m_sName;
  res->m_sSex = m_sSex;
  res->m_sAge = m_sAge;

  return res;
 }

private:
 WorkExperience* m_pWe;
 std::string m_sName;
 std::string m_sAge;
 std::string m_sSex;
};

int _tmain(int argc, _TCHAR* argv[])
{
 Resume* res = new Resume("大鸟");
 res->SetPersonalInfo("29", "男");
 res->SetWorkExperience("2008-2011", "XX");

 Resume* res1 = (Resume*)res->Clone();
 res1->SetWorkExperience("2009-2012", "YY");

 Resume* res2 = (Resume*)res->Clone();
 res2->SetWorkExperience("2009-2012", "ZZ");

 res->DisplayInfo();
 res1->DisplayInfo();
 res2->DisplayInfo();

 delete res;
 delete res1;
 delete res2;

 return 0;
}