设计模式之原型模式，C++实现

原创：http://blog.csdn.net/iuhsihsow

其实个人觉得原型模式在C++也就那样吧。反正设计一个类，如果有需要都会重载=或者设置深拷贝函数。

所以就简单写一下吧。

示意图，UML还是不太会

代码：

#include "stdafx.h" #include <memory.h> #include <stdio.h> #include <string.h> #include <locale.h> #include <iostream>     // 原型模式其实就是从一个对象再创建另外一个可定制的对象，而且不需要知道任何创建的细节   // 问1：和deepCopy有什么区别？重载"="或者写一个DeepCopy函数就可以了嘛？ // 问2：貌似没有最大限度的节省内存，要节省内存是不是要用享元模式？ // 问3：C++里面可没有什么MemberwiseClone()    // 假设情景，某游戏，当用户新建角色时，会出现一个基础角色， // 然后用户再在此基础上对该基础角色进行修改 // （其实应该是根据玩家的性别，身形选择，大致创建一个基础的角色外形，然后由玩家装扮，本处简化）  // char *纯粹是用于深拷贝  #define DELETE_OBJECT(p){ if (p) delete p;p = NULL; }  enum ESex { male, famale };  class IRole { public: virtual void Setproperty(ESex eSex, int nAge) = 0; virtual void SetDescription(char * pDescpt, int nLength) = 0; virtual void Show() = 0; virtual IRole* Clone() = 0; virtual void SetName(const std::string &strName) = 0;  protected: std::string m_strName; ESexm_eSex; intm_nAge; char*m_pDescription; intm_nDscriptLength;  };  class BaseRole : public IRole { public: BaseRole() //: m_eSex(male) //, m_nAge(25) //, m_pDescription(NULL) { m_eSex = male; m_nAge = 25; m_pDescription = NULL; } virtual ~BaseRole() { DELETE_OBJECT(m_pDescription); }  void SetName(const std::string &strName) { m_strName = strName; } void Setproperty(ESex eSex, int nAge) { m_eSex = eSex; m_nAge = nAge; } void SetDescription(char * pDescpt, int nLength) { m_nDscriptLength = nLength; m_pDescription = new char[nLength + 1]; memset(m_pDescription, 0, nLength + 1); memcpy(m_pDescription, pDescpt, nLength); } void Show() { printf("\n\nNow Show A Role Information:\n"); printf("Name:%s\n", m_strName.c_str()); if (male == m_eSex) { printf("Sex: Male\n"); } else { printf("Sex: FeMale\n"); } printf("Age :%d\n", m_nAge); printf(m_pDescription); printf("\n"); } IRole* Clone() { BaseRole * pRole = new BaseRole; pRole->m_eSex = m_eSex; pRole->m_nAge = m_nAge; pRole->m_strName = m_strName; pRole->m_nDscriptLength = m_nDscriptLength; pRole->m_pDescription = new char[m_nDscriptLength + 1]; memset(pRole->m_pDescription, 0, m_nDscriptLength + 1); memcpy(pRole->m_pDescription, m_pDescription, m_nDscriptLength); return pRole; }  protected: private: };   int _tmain(int argc, _TCHAR* argv[]) {  //创建描述语句 char *pChar = "So clever!"; int nLength = strlen(pChar);  char *pChar_1 = "A Nice People!"; int nLength_1 = strlen(pChar_1);  //创建BaseRole BaseRole *pBase = new BaseRole; pBase->Setproperty(male, 15); pBase->SetDescription(pChar, nLength); pBase->SetName("BaseRole");  //根据BaseRole创建其他 BaseRole *pTom = (BaseRole*)pBase->Clone(); pTom->SetDescription(pChar_1, nLength_1); pTom->SetName("Tom");  BaseRole *pLucy = dynamic_cast<BaseRole*>(pBase->Clone()); pLucy->Setproperty(famale, 18); pLucy->SetName("Lucy");  pBase->Show(); pTom->Show(); pLucy->Show();  DELETE_OBJECT(pBase); DELETE_OBJECT(pTom); DELETE_OBJECT(pLucy);  return 0; }  /*结果 Now Show A Role Information: Name:BaseRole Sex: Male Age :15  So clever!    Now Show A Role Information: Name:Tom Sex: Male Age :15  A Nice People!    Now Show A Role Information: Name:Lucy Sex: FeMale Age :18  So clever!  请按任意键继续. . . */