命令模式之C++实现

 

 

#include  " stdafx.h "
#include < string>
#include <vector>
#include <iostream>
using  namespace std;

class Kitchener
{
public:
     void MakeHamburger()
    {
        cout <<  " 做汉堡包 " << endl;
    }

     void MakeChips()
    {
        cout <<  " 做薯条 " << endl;
    }

     void MakeCake()
    {
        cout <<  " 做蛋糕 " << endl;
    }
};

class Command
{
protected:
    Kitchener *pKitchener;
public:
    Command(Kitchener *kitchener)
    {
        pKitchener = kitchener;
    }

     virtual  void MakeFood() =  0;
};

class CakeCommad :  public Command
{
public:
    CakeCommad(Kitchener *kitchener) : Command(kitchener){}
     virtual  void MakeFood()
    {
        pKitchener->MakeCake();
    }
};

class ChipsCommad :  public Command
{
public:
    ChipsCommad(Kitchener *kitchener) : Command(kitchener){}
     virtual  void MakeFood()
    {
        pKitchener->MakeChips();
    }
};

class HamburgerCommad :  public Command
{
public:
    HamburgerCommad(Kitchener *kitchener) : Command(kitchener){}
     virtual  void MakeFood()
    {
        pKitchener->MakeHamburger();
    }
};


class Waiter
{
private:
    vector<Command*> m_vecCmd;
public:

     void AddCommand(Command *command)
    {
        m_vecCmd.push_back(command);
    }

     void MoveCommand(Command *command)
    {
         for (vector<Command*>::iterator it = m_vecCmd.begin(); it != m_vecCmd.end(); )
        {
             if (*it = command)
            {
                m_vecCmd.erase(it);
                 break;
            }
            it++;
        }
    }

     void Notify()
    {
        Command* pCommad = NULL;
         for (vector<Command*>::iterator it = m_vecCmd.begin(); it != m_vecCmd.end(); it++)
        {
            pCommad = *it;
            pCommad->MakeFood();
        }
    }
};

int main()
{
    Kitchener *pKitchener =  new Kitchener;
    Command *pCommand1 =  new CakeCommad(pKitchener);
    Command *pCommand2 =  new ChipsCommad(pKitchener);
    Command *pCommand3 =  new HamburgerCommad(pKitchener);
    Waiter *pWaiter =  new Waiter;
    pWaiter->AddCommand(pCommand1);
    pWaiter->AddCommand(pCommand2);
    pWaiter->AddCommand(pCommand3);
    pWaiter->MoveCommand(pCommand1);
    pWaiter->Notify();
     return  0;
}