[2023.4.9]C++单例模式(线程安全)

https://blog.csdn.net/yockie/article/details/40790347

https://blog.csdn.net/u010029439/article/details/79439332

class Singleton   

{   

private:   

    Singleton();

    ~Singleton();

public:   

    static Singleton &instance()   

    {   

        Lock(); // not needed after C++0x   

        static Singleton instance;   

        UnLock(); // not needed after C++0x   

        return instance;    

    }   

};

C++11,先前被称作C++0x

instance对象位于全局区，new的话是堆区，不用static的话是栈区。

模板化：

template

class Singleton {

public:

    static T& GetInstance()

    {

        static T instance;

        return instance;

    }

private:

    // 防止函数被调用

    Singleton() = delete;

    ~Singleton() = delete;

};