備忘錄模式

前序

相信玩游戲每個(gè)人都會(huì)，今天就來講講關(guān)于游戲進(jìn)度的保存機(jī)制，也就是備忘錄模式。

備忘錄模式

在不破壞封裝性的前提下，捕獲一個(gè)對(duì)象的內(nèi)部狀態(tài)，兵在該對(duì)象之外保存這個(gè)狀態(tài)。這樣以后就可以將該對(duì)象恢復(fù)到原先保存的狀態(tài)。

實(shí)現(xiàn)方式(UML類圖)

實(shí)現(xiàn)代碼

#include <stdio.h>

// 角色狀態(tài)存信息

class RoleStateMemento

{

public:

         int vit;

         int atk;

         int def;

         int level;

         int pass;

         RoleStateMemento(int _vit, int _atk, int _def, int _level, int _pass) : vit(_vit), atk(_atk), def(_def), level(_level), pass(_pass){}

};

// 游戲角色

class GameRole : public RoleStateMemento

{

public:

         GameRole() : RoleStateMemento(100, 100, 100, 1, 1) {}

         RoleStateMemento* SaveState()

         {

                   return new RoleStateMemento(vit, atk, def, level, pass);

         }

         void RecoveryState(RoleStateMemento* pMemento)

         {

                   vit = pMemento->vit;

                   atk = pMemento->atk;

                   def = pMemento->def;

                   level = pMemento->level;

                   pass = pMemento->pass;

         }

         void Fight()

         {

                   vit -= 20; // 第一關(guān)損失了20點(diǎn)血

                   pass++;

                   vit -= 40; // 第二關(guān)損失了40點(diǎn)血

                   level++; // 升級(jí)了

                   atk++;

                   def++;

                   pass++;

                   vit = 0; // 第三關(guān)直接被Boss干掉了

         }

         void StateDisplay()

         {

                   printf("當(dāng)前血量: %d\n", vit);

                   printf("當(dāng)前攻擊力: %d\n", atk);

                   printf("當(dāng)前防御力: %d\n", def);

                   printf("當(dāng)前等級(jí): %d\n", level);

                   printf("當(dāng)前關(guān)卡: %d\n\n", pass);

         }

};

// 角色狀態(tài)管理者

class RoleStateCaretaker

{

public:

         RoleStateMemento* pMemento;

};

int main()

{

         // 大戰(zhàn)Boss前

         GameRole* lixiaoyao = new GameRole();

         // 保存進(jìn)度

         RoleStateCaretaker* stateAdmin = new RoleStateCaretaker();

         stateAdmin->pMemento = lixiaoyao->SaveState();

         // 大戰(zhàn)Boss時(shí)，直接被干掉了

         lixiaoyao->Fight();

         lixiaoyao->StateDisplay();

         // 恢復(fù)之前的進(jìn)度

         if(lixiaoyao->vit == 0)

         {

                   lixiaoyao->RecoveryState(stateAdmin->pMemento);

                   lixiaoyao->StateDisplay();

         }

         delete stateAdmin->pMemento;

         delete stateAdmin;

         delete lixiaoyao;

         return 0;

}

運(yùn)行結(jié)果

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