软件设计模式 --状态模式

来源：互联网发布：澳洲dodo网络上不了网编辑：程序博客网时间：2024/05/22 15:55

//P: 抽象状态类，实现具体类，根据需要生成具体类对象赋值给抽象类变量

#include <stdio.h>#include   <iostream>   using   namespace   std;class War;  class State   {  public:  virtual void Prophase() {}  virtual void Metaphase() {}  virtual void Anaphase() {}  virtual void End() {}  virtual void CurrentState(War *war) {}  };  //战争  class War  {  private:  State *m_state;  //目前状态  int m_days;      //战争持续时间  public:  War(State *state): m_state(state), m_days(0) {}  ~War() { delete m_state; }  int GetDays() { return m_days; }  void SetDays(int days) { m_days = days; }  void SetState(State *state) { delete m_state; m_state = state; }  void GetState() { m_state->CurrentState(this); }  }; class EndState: public State  {  public:  void End(War *war) //结束阶段的具体行为  {  cout<<"战争结束"<<endl;  }  void CurrentState(War *war) { End(war); }  };  //后期  class AnaphaseState: public State  {  public:  void Anaphase(War *war) //后期的具体行为  {  if(war->GetDays() < 30)  cout<<"第"<<war->GetDays()<<"天：战争后期，双方拼死一搏"<<endl;  else  {  war->SetState(new EndState());  war->GetState();  }  }  void CurrentState(War *war) { Anaphase(war); }  };  //中期  class MetaphaseState: public State  {  public:  void Metaphase(War *war) //中期的具体行为  {  if(war->GetDays() < 20)  cout<<"第"<<war->GetDays()<<"天：战争中期，进入相持阶段，双发各有损耗"<<endl;  else  {  war->SetState(new AnaphaseState());  war->GetState();  }  }  void CurrentState(War *war) { Metaphase(war); }  };  //前期  class ProphaseState: public State  {  public:  void Prophase(War *war)  //前期的具体行为  {  if(war->GetDays() < 10)  cout<<"第"<<war->GetDays()<<"天：战争初期，双方你来我往，互相试探对方"<<endl;  else  {  war->SetState(new MetaphaseState());  war->GetState();  }  }  void CurrentState(War *war) { Prophase(war); }  };int main(){War *m_war =  new War(new ProphaseState);for (int i=0 ;i< 40; i=i+10){m_war->SetDays(i);m_war->GetState();}delete m_war;getchar();return 0;}

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