[行为型模式]命令模式的理解

客官°小女子只卖身不卖艺 2022-04-11 05:40 320阅读 0赞

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\[color=red\]\[b\]头文件\[/b\]\[/color\]

//CommandPattern.h
    
    #ifndef COMMAND_PATTERN_H
    #define COMMAND_PATTERN_H
    
    #include <Windows.h>
    #include <string>
    using namespace std;
    
    
    namespace CommandPattern
    {
       
    
    class Receiver
    {
       
    public:
        void Action();
    };
    
    class AbstructCommand
    {
       
    public:
        virtual ~AbstructCommand();
        virtual void Execute() = 0;
    };
    
    class ConcretetCommand : public AbstructCommand
    {
       
    public:
        ConcretetCommand(Receiver* pReciver);
        virtual ~ConcretetCommand();
        virtual void Execute();
    
    private:
        Receiver* m_pReciver;
    };
    
    
    class Invoker
    {
       
    public:
        Invoker(AbstructCommand* pCommand);
    
        void Order();
    
    private:
        AbstructCommand* m_pCommand;
    };
    
    //
    void CommandPattern_Test();
    }
    
    #endif

\[color=red\]\[b\]实现\[/b\]\[/color\]

#include "CommandPattern.h"
    #include <iostream>
    using namespace std;
    
    #define SAFE_DELETE(p) if (p) { delete p; p = NULL; }
    
    namespace CommandPattern
    {
       
        //
         void Receiver::Action()
         {
       
             cout << "Receiver->Action" << endl;
         }
    
         //
         AbstructCommand::~AbstructCommand()
         {
       
    
         }
    
        //
        ConcretetCommand::ConcretetCommand(Receiver* pReciver)
            : m_pReciver(NULL)
        {
       
            if (m_pReciver==NULL && pReciver!=NULL)
            {
       
                m_pReciver = pReciver;
            }
        }
    
        ConcretetCommand::~ConcretetCommand()
        {
       
    
        }
    
        void ConcretetCommand::Execute()
        {
       
            if (m_pReciver != NULL)
            {
       
                cout << "ConcretetCommand->Execute" << endl;
                m_pReciver->Action();
            }
        }
    
        //
        Invoker::Invoker(AbstructCommand* pCommand)
            : m_pCommand(NULL)
        {
       
            if (m_pCommand==NULL && pCommand!=NULL)
            {
       
                m_pCommand = pCommand;
            }
        }
    
        void Invoker::Order()
        {
       
            cout << "Invoker->Order" << endl;
            m_pCommand->Execute();
        }
    
    
        void CommandPattern_Test()
        {
       
            Receiver* pReceiver = new Receiver();
            ConcretetCommand* pConcreteCmd = new ConcretetCommand(pReceiver);
            Invoker* pInvoker= new Invoker(pConcreteCmd);
    
            pInvoker->Order();
    
            SAFE_DELETE(pReceiver);
            SAFE_DELETE(pConcreteCmd);
            SAFE_DELETE(pInvoker);
        }
    }

\[color=red\]\[b\]客户端\[/b\]\[/color\]

#include "CommandPattern.h"
    
    
    #include <iostream>
    using namespace std;
    using namespace CommandPattern;
    void main()
    {
       
        CommandPattern_Test();
    }

\[color=red\]\[b\]运行结果\[/b\]\[/color\]

Invoker->Order
    ConcretetCommand->Execute
    Receiver->Action

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