/************************************************************************//*                         状态模式                                     *//************************************************************************/#include 
     
      using namespace std;/*    一个状态接口，不同的状态从该接口中继承出来，想要增加新的状态    时，只需从此接口中派生出新的类即可，适合于当判断较多(多个状态切换频繁)的场合    这里引入一个程序员写工程程序的例子，程序员在一天的不同时间会处于不同的状态    如果程序写不完还得加班,即程序员的状态会随着时间发生改变*/class Work;/*状态接口State*/class State{public:    virtual void WriteProgram(Work *w) = 0;//写程序的行为(与Work相关的行为)};//工作类class Work{private:    State *current;//当前状态    double hour;    bool taskFinish;        public:    Work()    {        taskFinish = false;    }    void SetTime(double hour)    {        this->hour = hour;    }    double GetTime()    {        return this->hour;    }        //设置状态    void SetState(State *s)    {        current = s;    }        //设置工程是否完成    void SetFinish()    {        taskFinish = true;    }    bool GetFinish()    {        return taskFinish;    }            void WriteProgram()    {        current->WriteProgram(this);    }    };//下班休息状态class RestState : public State{public:    void WriteProgram(Work *w)    {        cout<<"当前时间:"<
      
       GetTime()<<"点 工作完成，下班回家了"<
       
        GetTime()<<"点了，先睡吧"<
        
         GetFinish())        {            w->SetState(new RestState());            w->WriteProgram();        }else        {            if(w->GetTime()<21){                cout<<"当前时间:"<
         
          GetTime()<<"点 加班了，疲惫至极"<
          
           SetState(new SleepingState()); w->WriteProgram(); } } } };//下午工作状态class AfternoonState : public State{ public: void WriteProgram(Work *w) { if(w->GetTime()<17) { cout<<"当前时间:"<
           
            GetTime()<<"点 状态还不错，继续努力"<
            
             SetState(new EveningState()); w->WriteProgram(); } }};//中午工作状态class NoonState : public State{public: void WriteProgram(Work *w) { if (w->GetTime()<13) cout<<"当前时间:"<
             
              GetTime()<<"点 饿了，午饭:犯困，午休"<
              
               SetState(new AfternoonState()); w->WriteProgram(); } } };//上午工作状态class ForenoonState : public State{public: void WriteProgram(Work *w) { if(w->GetTime()<12) cout<<"当前时间:"<
               
                GetTime()<<"点 上午工作，精神百倍"<
                
                 SetState(new NoonState()); w->WriteProgram(); } } };void main(){ //紧急项目 Work *emergencyProjects = new Work(); emergencyProjects->SetState(new ForenoonState()); emergencyProjects->SetTime(9); emergencyProjects->WriteProgram(); emergencyProjects->SetTime(10); emergencyProjects->WriteProgram(); emergencyProjects->SetTime(12); emergencyProjects->WriteProgram(); emergencyProjects->SetTime(14); emergencyProjects->WriteProgram(); //完成工作，不需要再加班了 //emergencyProjects->SetFinish(); emergencyProjects->SetTime(19); emergencyProjects->WriteProgram(); emergencyProjects->SetTime(22); emergencyProjects->WriteProgram();}