单例模型

[c++]代码库

#ifndef SINGLETON_H
#define SINGLETON_H

#include "synobj.h"

class Singleton {
public:
    static Singleton& Instance() { // Unique point of access
        Lock lock(_mutex);
        if (0 == _instance) {
            _instance = new Singleton();
            atexit(Destroy); // Register Destroy function
        }
        return *_instance;
    }
    void DoSomething(){}
private:
    static void Destroy() { // Destroy the only instance
        if ( _instance != 0 ) {
            delete _instance;
            _instance = 0;
        }
    }
    Singleton(){} // Prevent clients from creating a new Singleton
    ~Singleton(){} // Prevent clients from deleting a Singleton
    Singleton(const Singleton&); // Prevent clients from copying a Singleton
    Singleton& operator=(const Singleton&);
private:
    static Mutex _mutex;
    static Singleton *_instance; // The one and only instance
};

#endif/*SINGLETON_H*/