📄 hotdog.cpp.html

📁 《Big C++ 》Third Edition电子书和代码全集-Part1
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<pre>  1  #include "event.h"
  2  #include &lt;iostream&gt;
  3  
  4  using namespace std;
  5  
  <font color="#0000cc">6  /**
  7     Simulation of a hot dog stand with limited seating
  8  */</font>
  9  class HotDogStand : public Simulation 
 10  {
 11  public:
 12     HotDogStand(int s);
 <font color="#0000cc">13     /**
 14        Test to see if new customer can be seated.
 15        @return true if customer is seated
 16     */</font>
 17     bool can_seat();
 18  
 <font color="#0000cc">19     /**
 20        Satisfied customer leaves, having eaten.
 21     */</font>
 22     void customer_leaves();
 23  private:
 24     int free_seats;
 25  };
 26  
 27  HotDogStand::HotDogStand(int s) : free_seats(s) {}
 28  
 29  bool HotDogStand::can_seat()
 30  {
 31     if (free_seats &gt; 0) 
 32     {
 33        free_seats--;
 34        return true;
 35     }
 36     else
 37        return false;
 38  }
 39  
 40  void HotDogStand::customer_leaves() 
 41  {
 42     free_seats++;
 43  }
 44  
 45  HotDogStand freds(3);
 46  
 <font color="#0000cc">47  /**
 48     Arrival event for simulation.
 49     Either customer is seated, or leaves without eating.
 50  */</font>
 51  class ArriveEvent : public Event 
 52  {
 53  public:
 54     ArriveEvent(int t);
 55     virtual void do_event();
 56  };
 57  
 <font color="#0000cc">58  /**
 59     Leave event for simulation.
 60     Satisfied customer leaves and releases seat.
 61  */</font>
 62  class LeaveEvent : public Event 
 63  {
 64  public:
 65     LeaveEvent(int t);
 66     virtual void do_event();
 67  };
 68  
 69  ArriveEvent::ArriveEvent(int t) : Event(t) {}
 70  
 71  void ArriveEvent::do_event()
 72  {
 73     if (freds.can_seat()) 
 74     {
 75        cout &lt;&lt; "time " &lt;&lt; time &lt;&lt; " Customer is seated\n";
 76        freds.schedule_event(new LeaveEvent(time + rand_int(1, 5)));
 77     }
 78     else
 79        cout &lt;&lt; "time " &lt;&lt; time 
 80           &lt;&lt; " Customer is unable to find a seat, leaves\n";
 81  }
 82  
 83  LeaveEvent::LeaveEvent(int t) : Event(t) {}
 84  
 85  void LeaveEvent::do_event()
 86  {
 87     cout &lt;&lt; "time " &lt;&lt; time &lt;&lt; " Customer finishes eating, leaves\n";
 88     freds.customer_leaves();
 89  }
 90  
 91  int main()
 92  {
 93     for (int i = 0; i &lt; 50; i++)
 94        freds.schedule_event(new ArriveEvent(rand_int(1, 60)));
 95     freds.run();
 96     return 0;
 97  }</pre>
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