自动回收资源的单例模式

本文介绍一种很简单的可以自动回收资源的单例模式，平时也经常看别个写的技术文章，CSDN里面有很多牛人，他们写的文章通俗易懂，言简意赅，能给看文章的人带来美的享受。但也有很多写技术文章的童鞋文章冗长，屁话一大篇，浪费时间。好了我废话少说，希望本文对有需要的人能有所帮助：

• 测试环境：Linux CentOS7.2

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直接上代码，小伙伴们可以复制到自己的环境里面编译运行。C++这东西，还是自己咀嚼才有味道。

代码块[SingletonLogManager.h]

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/* 
 * File:   SingletonLogManager.h
 * Author: Jerry
 *
 * Created on 2017年8月8日, 下午2:25
 */

#ifndef SINGLETONLOGMANAGER_H
#define SINGLETONLOGMANAGER_H

#include 
using namespace std;

class SingletonLogManager 
{
public:
    static SingletonLogManager* GetInstance();    // 获取一个实例

public:
    void print();

protected:
    SingletonLogManager();
    ~SingletonLogManager();


    // 资源回收
    class SingletonRecovery   
    {  
    public:  
        SingletonRecovery()  
        {  

        }  
        ~SingletonRecovery()  
        {  
        cout << " begin to run destruction !" << endl;
            if (m_pInstance != NULL)  
            {  
                delete m_pInstance;  
                m_pInstance = NULL;                  
            }  
        }  
    };  

    // 资源回收类
    static SingletonRecovery m_SR;  

private:
    static SingletonLogManager*                            m_pInstance;                  // 静态指针

};

#endif /* LOGTOOL_H */

代码块[SingletonLogManager.cpp]

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/* 
 * File:   LogTool.cpp
 * Author: Jerry
 * 
 * Created on 2017年8月8日, 下午2:25
 */
#include 
#include 
#include "SingletonLogManager.h"

// new一个实例
SingletonLogManager* SingletonLogManager::m_pInstance = new SingletonLogManager;
SingletonLogManager::SingletonRecovery SingletonLogManager::m_SR;


SingletonLogManager::SingletonLogManager() 
{

}

SingletonLogManager::~SingletonLogManager()
{

}

// 获取实例
SingletonLogManager* SingletonLogManager::GetInstance()
{
    return m_pInstance;
}

void SingletonLogManager::print()
{
  printf("SingletonLogManager::print()\n\n");
}

代码块[main.cpp]

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/* 
 * File:   LogTool.cpp
 * Author: Jerry
 * 
 * Created on 2017年8月8日, 下午2:25
 */

#include 
#include "SingletonLogManager.h"

void testRecovery()
{
  SingletonLogManager* pSingletonLogManager = SingletonLogManager::GetInstance();
  pSingletonLogManager->print();
}

int main()
{  
  cout << "testRecovery begin !" << endl;
  testRecovery();
  cout << "testRecovery end !" << endl;
  return 0;
}