C++中实现单例模式方法

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1.C++语言实现单例模方法一

class Singleton{private:static Singleton* single;Singleton(){cout<<"construct of Singleton"<<endl;}public:static Singleton& getInstance(){if(single==NULL)single=new Singleton();return *single;}class CGarbage{public:CGarbage(){cout<<"construct of CGarbage"<<endl;}~CGarbage(){if(single!=NULL)delete single;cout<<"delete single"<<endl;}};private:static CGarbage cg;};Singleton* Singleton::single=NULL;Singleton::CGarbage Singleton::cg;int main(){    Singleton::getInstance();    return 0;}

2.C++语言实现单例模式方法二

class Singleton{private:Singleton(){cout<<"construct of Singleton"<<endl;}public:static Singleton& getInstance(){static Singleton single;return single;}};

3.C++语言实现单例模式方法三

class Singleton{private:static Singleton single;Singleton(){cout<<"construct of Singleton"<<endl;}public:static Singleton& getInstance(){return single;}~Singleton(){cout<<"destruct of Singleton"<<endl;}};Singleton Singleton::single;

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