Singleton Design Pattern

In singleton design pattern, we restrict the instantiation of the object to only one. We make the constructor private and create a static method to control the instantiation

	class Singleton {
	Singleton() {};//make the constructor private
	static Singleton* _obj;// private object so that access is restricted
	public:
	//method to create object
	static Singleton*Getinstance() {
	if (_obj == NULL)
	_obj = new Singleton();
	return _obj;
	}
	//method to delete the object
	static void DeleteInstance()
	{
	if (_obj)
	{
	delete _obj;
	_obj = NULL;
	}
	}
	};
	//initialize the object
	Singleton* Singleton::_obj = NULL;
	int main()
	{
	//usage
	Singleton*pobj = Singleton::Getinstance();
	Singleton::DeleteInstance();
	return 0;
	}

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