template<typename T>
struct PickedVector : Vector<T>
{
	PickedVector()
	{
		Vector<T>() = *this;
	}
};

template<typename T>
const Vector<T>& VectorNull()
{
	return Single<PickedVector<T> >();
}

template<typename T>
bool IsNull(const Vector<T>& v)
{
	return v.IsPicked();
}

Cout() << "Is Null: " << IsNull(Vector<int>()) << EOL;
Cout() << "Is Null: " << IsNull(VectorNull<int>()) << EOL;

Is Null: false
Is Null: true