Implementation of an singleton in c++

singleton.cpp

/*
 *    Filename:  singleton.cpp
 *    Description:  singleton
 *
 *    Created:  06/12/2011 13:31:14
 *    Compiler:  gcc
 *
 *    Author:  Johannes82
 *
 */

#include <iostream>

using namespace std;

class Singleton {
    private:
        Singleton() {};
        ~Singleton() {};
        static Singleton* instance;

    public:
        static Singleton& getInstance();
};

Singleton* Singleton::instance = 0;

Singleton& Singleton::getInstance() {
    if (instance == NULL) {
        cout << "New instance!" << endl;
        instance = new Singleton();
    } else
        cout << "No new instance!" << endl;
    return *instance;
}


int main (void) {
    Singleton* singleton1;
    singleton1->getInstance();
    Singleton* singleton2;
    singleton2->getInstance();
    return 0;
}