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意图:将一个请求封装成一个对象,从而使您可以用不同的请求对客户进行参数化。
主要解决:在软件系统中,行为请求者与行为实现者通常是一种紧耦合的关系,但某些场合,比如需要对行为进行记录、撤销或重做、事务等处理时,这种无法抵御变化的紧耦合的设计就不太合适。

代码:

#include <iostream>
#include <list>
using namespace std;

// 厨师
class Cook
{
public:
    void cookChicken()
    {
        cout << "cook chicken" << endl;
    }

    void cookBeef()
    {
        cout << "cook beaf" << endl;
    }
};

class Command
{
public:
    virtual ~Command() {}
    Command(Cook *c) :_cook(c) {}
public:
    virtual void executeCmd() = 0;
protected:
    Cook *_cook;
};


class CookChicken : public Command
{
public:
    CookChicken(Cook *c) :Command(c){}
public: virtual void executeCmd() { _cook->cookChicken(); } }; class CookBeef : public Command { public: CookBeef(Cook *c) :Command(c){} public: virtual void executeCmd() { _cook->cookBeef(); } }; class Waiter { public: Waiter() { _commandList.clear(); } ~Waiter() { _commandList.clear(); } void addOrder(Command *c) { cout << "增加订单" << endl; _commandList.push_back(c); } void notify() { for (auto it = _commandList.begin(); it != _commandList.end(); ++it) { (*it)->executeCmd(); } _commandList.clear(); } private: list<Command *> _commandList; }; void test() { Cook *cook = new Cook(); // 厨师 Waiter *waiter = new Waiter(); // 服务员 Command *cmd1 = new CookChicken(cook); Command *cmd2 = new CookBeef(cook); waiter->addOrder(cmd1); waiter->addOrder(cmd2); waiter->notify(); // 发送通知 delete cook; delete waiter; delete cmd1; delete cmd2; } int main() { test(); cin.get(); return 0; }

效果:

 

posted on 2017-05-19 19:01  wanlifeipeng  阅读(118)  评论(0编辑  收藏  举报