상속받아 쓰는 싱글턴 패턴 템플릿

template <typename T> class CSingleton
{
    static T* ms_Singleton;

public:
    CSingleton(void)
    {
        assert(!ms_Singleton);
        int offset = (int)(T*)1 - (int)(CSingleton <T>*)(T*)1;
        ms_Singleton = (T*)((int)this + offset);
    }

    ~CSingleton(void)
    {
        assert(ms_Singleton);
        ms_Singleton = 0;
    }

    static T* GetSingleton(void)
    {
        assert(ms_Singleton);
        return ms_Singleton;
    }

	static T* GetSingletonPtr(void)
	{
		if(ms_Singleton == NULL)
		{
			return ms_Singleton;
		}

        assert(ms_Singleton);
        return ms_Singleton;
	}

	static T& GetSingletonInstance(void)
	{
        assert(ms_Singleton);
		return(*ms_Singleton);
	}
};

template <typename T> T* CSingleton <T>::ms_Singleton = 0;