[创建型模式] 单例模式的理解

曾经终败给现在 2022-04-11 04:59 182阅读 0赞

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\[color=red\]\[b\]头文件\[/b\]\[/color\]

//SingletonPattern.h
    
    #ifndef SINGLETON_PATTERN_H
    #define SINGLETON_PATTERN_H
    
    #include <Windows.h>
    #include <string>
    using namespace std;
    
    namespace SingletonPattern
    {
       
        // Base Class
        //
        class Singleton
        {
       
        public:
            static Singleton* GetInstance()
            {
       
                static Singleton cSingleton;
    
                return &cSingleton;
            }
    
        private:
            Singleton();
            virtual ~Singleton();
        };
    
        //
        void SingletonPattern_Test_A();
        void SingletonPattern_Test_B();
    
    }
    
    #endif

\[color=red\]\[b\]实现\[/b\]\[/color\]

#include "SingletonPattern.h"
    #include <iostream>
    using namespace std;
    
    namespace SingletonPattern
    {
       
    
        //
        Singleton::Singleton()
        {
       
        }
        Singleton::~Singleton()
        {
       
        }
    
        //
        void SingletonPattern_Test_A()
        {
       
            Singleton* pInstance = Singleton::GetInstance();
    
            cout << "SingletonPattern_Test_A    Instance address:0x" << pInstance << endl;
        }
    
        void SingletonPattern_Test_B()
        {
       
            Singleton* pInstance = Singleton::GetInstance();
    
            cout << "SingletonPattern_Test_B    Instance address:0x" << pInstance << endl;
        }
    }

\[color=red\]\[b\]客户端\[/b\]\[/color\]

#include "SingletonPattern.h"
    
    #include <iostream>
    using namespace std;
    using namespace SingletonPattern;
    
    void main()
    {
       
        SingletonPattern_Test_A();
        SingletonPattern_Test_B();
    }

\[color=red\]\[b\]运行结果\[/b\]\[/color\]  
\[img\]http://chuantu.biz/t4/13/1462936340x3738746553.jpg\[/img\]  
\[img\]http://chuantu.biz/t4/13/1462936356x3738746553.jpg\[/img\]