//Singleton  Implementation:



 #include <iostream>
using namespace std;
class Singletondemo
{private:
    static bool flag;
    static Singletondemo *single;
    Singletondemo()
    {
        //private constructor
    }
   public:
    static Singletondemo* getInstance();
    void method();
    ~Singletondemo()
    {        flag = false;    }};

bool Singletondemo::flag = false;
Singletondemo* Singletondemo::single = NULL;
Singletondemo* Singletondemo::getInstance()
{
    if(! flag)
    {
        single = new Singletondemo();
        flag = true;
        return single;
    }
    else
    {
        return single;
    }
}
void Singletondemo::method()
{    cout << "Method of the Singletondemo class" << endl;}

int main()
{    Singletondemo *sc1,*sc2;
    sc1 = Singletondemo::getInstance();
    sc1->method();
    sc2 = Singletondemo::getInstance();
    sc2->method();
    return 0;
}