状态模式(大话设计模式)C/C++版本

状态模式

C++

#include <iostream>
using namespace std;class State;
class ForenoonState;
class NoonState;
class AfternonnState;
class EveningState;
class SleepingState;
class RestState;
class Work;// 抽象状态角色，负责定义各个状态有哪些行为，该抽象状态包含所有具体状态的方法。并且封装环境角色，帮助切换状态。
class State
{
public:virtual void writeprogram(Work *w) = 0;virtual ~State() = default;
};
// Context 角色，在该类内部维护一个ConcreteState子类的一个实例，可以负责具体状态的切换
class Work
{
private:State *current;double m_hour;bool m_finish = false;public:Work();~Work();void setHour(double hour) { m_hour = hour; }double getHour() { return m_hour; }void setFinish(bool finish) { m_finish = finish; }bool getFinish() { return m_finish; }void SetState(State *s){delete current;current = s;}void WorkProgram(){current->writeprogram(this);}
};// 下面都是具体的状态类，每一个具体状态类必须完成两个职责：该类本状态下要做的事情，以及如何执行到其他具体状态类的状态。
class ForenoonState : public State
{
public:void writeprogram(Work *w) override;
};class NoonState : public State
{
public:void writeprogram(Work *w) override;
};class AfternoonState : public State
{
public:void writeprogram(Work *w) override;
};class EveningState : public State
{
public:void writeprogram(Work *w) override;
};class SleepingState : public State
{ // 睡眠状态
public:void writeprogram(Work *w) override;
};class RestState : public State
{ // 下班休息状态
public:void writeprogram(Work *w) override;
};Work::Work()
{current = new ForenoonState();
}
Work::~Work()
{delete current;
}void ForenoonState::writeprogram(Work *w)
{if (w->getHour() < 12){cout << "当前时间：" << w->getHour() << "点,上午工作，精神百倍" << endl;}else{w->SetState(new NoonState());w->WorkProgram();}
}void NoonState::writeprogram(Work *w)
{if (w->getHour() < 13){cout << "当前时间：" << w->getHour() << "点,吃午饭，睡午觉" << endl;}else{w->SetState(new AfternoonState());w->WorkProgram();}
}void AfternoonState::writeprogram(Work *w)
{if (w->getHour() < 17){cout << "当前时间：" << w->getHour() << "点,下午状态还不错" << endl;}else{w->SetState(new EveningState());w->WorkProgram();}
}void EveningState::writeprogram(Work *w)
{if (w->getFinish()){w->SetState(new RestState());w->WorkProgram();}else{if (w->getHour() < 21){cout << "当前时间：" << w->getHour() << "点,加班哦，疲惫至极 " << endl;}else{w->SetState(new SleepingState());w->WorkProgram();}}
}void SleepingState::writeprogram(Work *w)
{cout << "当前时间：" << w->getHour() << "点,不行了，睡着了 " << endl;
}void RestState::writeprogram(Work *w)
{cout << "当前时间：" << w->getHour() << "点,下班回家了 " << endl;
}int main()
{Work emergencyProjects;emergencyProjects.setHour(9);emergencyProjects.WorkProgram();emergencyProjects.setHour(10);emergencyProjects.WorkProgram();emergencyProjects.setHour(12);emergencyProjects.WorkProgram();emergencyProjects.setHour(13);emergencyProjects.WorkProgram();emergencyProjects.setHour(14);emergencyProjects.WorkProgram();emergencyProjects.setHour(17);emergencyProjects.WorkProgram();emergencyProjects.setFinish(false);emergencyProjects.setHour(19);emergencyProjects.WorkProgram();emergencyProjects.setHour(22);emergencyProjects.WorkProgram();return 0;
}

C

#include <stdio.h>typedef struct Work
{enum{FORENOON,NOON,AFTERNOON,EVENING,SLEEPING,REST} state;double hour;int finish;
} Work;void forenoonState(Work *w);
void noonState(Work *w);
void afternoonState(Work *w);
void eveningState(Work *w);
void sleepingState(Work *w);
void restState(Work *w);void workProgram(Work *w)
{switch (w->state){case FORENOON:forenoonState(w);break;case NOON:noonState(w);break;case AFTERNOON:afternoonState(w);break;case EVENING:eveningState(w);break;case SLEEPING:sleepingState(w);break;case REST:restState(w);break;default:break;}
}void forenoonState(Work *w)
{if (w->hour < 12){printf("当前时间：%lf点,上午工作，精神百倍\n", w->hour);}else{w->state = NOON;workProgram(w);}
}void noonState(Work *w)
{if (w->hour < 13){printf("当前时间：%lf点,吃午饭，睡午觉\n", w->hour);}else{w->state = AFTERNOON;workProgram(w);}
}void afternoonState(Work *w)
{if (w->hour < 17){printf("当前时间：%lf点,下午状态还不错\n", w->hour);}else{w->state = EVENING;workProgram(w);}
}void eveningState(Work *w)
{if (w->hour < 21){printf("当前时间：%lf点,加班哦，疲惫至极\n", w->hour);}else{w->state = SLEEPING;workProgram(w);}
}void sleepingState(Work *w)
{printf("当前时间：%lf点,不行了，睡着了\n", w->hour);
}void restState(Work *w)
{printf("当前时间：%lf点,下班回家了\n", w->hour);
}int main()
{Work emergencyProjects = {FORENOON, 0, 0};emergencyProjects.hour = 9;workProgram(&emergencyProjects);emergencyProjects.hour = 10;workProgram(&emergencyProjects);emergencyProjects.finish = 0;emergencyProjects.hour = 19;workProgram(&emergencyProjects);emergencyProjects.hour = 22;workProgram(&emergencyProjects);return 0;
}