Singleton Pattern

Sometimes you need to only one instance of a class exist during the program runs.
Here is a Singleton Pattern Implementation in C++.

hedar file:

class Singleton {
private:
    static Singleton * single;
    Singleton( ) { }
    Singleton( const Singleton & instance ) { }
    const Singleton & operator = ( const Singleton & instance ) {  }
public:
    static Singleton * getInstance();
    ~Singleton( ) { }
};

source file:

Singleton * Singleton::single = NULL;
Singleton * Singleton::getInstance( ) {
    if( NULL == single ) {
        single = new Singleton( );
    }
    return single;
}